Route planning and chokepoints

Emergency evacuation route planning is mostly pre-event work. When every major road out of a coastal county fills with three million simultaneous evacuees — as happened during Hurricane Rita in 2005, when drivers covered 50 miles (80 km) in 4–5 hours — the driver who planned three routes and knows which chokepoints each one uses is in a categorically different position than the driver who opened a navigation app at the mandatory order. Route planning before an emergency is a 2–4 hour exercise per origin-destination pair. Executing the right route under pressure takes less than 30 seconds if the planning was done.

Action block

Do this first: Identify every bridge, tunnel, and single-lane segment on your primary home-to-bug-out-location route and mark one alternate bypass for each. (active time: 1–2 hours at a desk; 2–3 hours with a drive-through of alternates) Time required: Active planning: 2–4 hours per origin-destination pair; alternate drive-through: 1–2 hours per route; recurrence: review annually and after any major road change Cost range: Inexpensive — printed paper maps are inexpensive; offline map apps are free; the significant investment is time, not money Skill level: Beginner to intermediate — basic map-reading required; no specialist training needed Tools and supplies: Tools: paper maps (USGS topo, state DOT highway, county road atlas), compass, pencil + route notebook. Supplies: printed route sheets in a waterproof sleeve, offline map tiles pre-downloaded on phone or GPS unit. Safety warnings: (none) — this page covers planning methodology; execution risks are addressed in Evacuation planning and Bug-out planning

Educational use only

This page provides general educational information for emergency preparedness planning. It does not substitute for official evacuation orders or guidance from local emergency management agencies. Always follow instructions from local authorities during an actual emergency. Conditions vary significantly by region, road network, and threat type. Use this information at your own risk.

Before you start

What you need: USGS 7.5-minute topographic maps (free at nationalmap.gov) or state DOT highway maps for your region. A county road atlas is the most practical vehicle-routing tool. A compass and basic map orientation. A pencil and a dedicated route notebook.

Conditions: Do this exercise during normal conditions — not during a developing emergency. A route you have never driven is not an alternate; it is an assumption. Walk or drive every alternate route at least once in clear conditions before counting it as a real option.

What this page does not cover: This page covers route-planning methodology. For departure triggers and go/no-go decisions, see Evacuation planning and Bug-out planning. For foot navigation when maps and GPS are unavailable, see Navigation without digital tools.

Before you start:

Use this when: you are planning routes before an emergency for any origin-destination pair that matters (home to bug-out location, work to home, home to hospital, family rally point)
Do not use this when: you are mid-evacuation with no prior planning — execute your closest option and focus on real-time information gathering
Stop and escalate if: your local emergency management has issued contraflow or route-specific closures that make your pre-planned alternates invalid — verify current status via NOAA Weather Radio All Hazards (162.400–162.550 MHz) or local AM/FM broadcast before committing to a route

Chokepoints — what they are and why they matter

A chokepoint is a route segment where traffic, terrain, or infrastructure narrows your options to a single path. All alternate routes around the chokepoint either converge on the same point or require so much additional distance that they stop being practical alternates.

Every road network has them. They come in five categories:

Geographic chokepoints are terrain-forced: a mountain pass with a single road over it, a river crossing with one bridge, a lake or bay that requires a ferry. The terrain itself eliminates all other options.

Infrastructure chokepoints are built-in: a bridge, a tunnel, a single elevated highway section. These have the specific additional failure mode of closure — earthquakes, floods, structural damage, and emergency lockdowns all close infrastructure that terrain does not.

Traffic-pattern chokepoints exist in highway merges and urban interchange bottlenecks. These function as chokepoints during surge events even when roads remain open. During mass evacuation, a stretch of Interstate that normally handles 80,000 vehicles per day may see 300,000 vehicles in a 12-hour window.

Regulatory chokepoints include border checkpoints, toll plazas on limited-access roads, and ferry queuing systems. During emergencies, these can become functional chokepoints even when the road itself is open.

Event-driven chokepoints are temporary but real: police roadblocks at incident scenes, wildfire closure zones, washed-out segments during flooding, snow-closed passes during winter emergencies. These cannot be pre-mapped with certainty, but knowing where the roads narrow tells you where event-driven closures are most likely to appear.

Why pre-mapping matters

A 50-mile (80 km) route with one bridge and one tunnel has two critical chokepoints. If either closes, you need to know which segment is the problem before you reach it — not after you are sitting in the backup that extends 10 miles (16 km) behind it.

The mental model: draw your route as a line. Mark each chokepoint as a node on the line. For each node, ask: if this closes, what is the alternate path around this specific node? That alternate path is your contingency for that segment. You are not planning a whole new route — you are planning a detour around a specific problem segment. Then you chain the detour back into your primary route.

If a node has no alternate — if no road or path can bypass it within reasonable distance — that is a structural risk segment. Two routes that share a structural risk segment are not actually two routes. They are one route with a shared point of failure.

The Federal Highway Administration's (FHWA) Emergency Transportation Management guidance treats network vulnerability assessment — identifying chokepoints and single points of failure in road networks — as a core element of evacuation planning. The same principle applies at the household level.

Pre-event route planning sequence

This is the desk exercise. Sit down with maps before any emergency. Budget 1–2 hours per origin-destination pair for the desk work, and another 1–2 hours to drive through alternates in good conditions.

Step 1: Identify your critical origin-destination pairs. Most households have three to five that matter: home to bug-out location (BOL), home to family rally point, work to home, home to nearest hospital (if medical needs require it), and school to home. Write each pair down. You will plan routes for each one separately.

Step 2: Map your primary route. For each pair, identify the route you would take under normal conditions — the fastest route. Use a paper road map or county atlas alongside an offline-capable app. Trace the route in pencil.

Step 3: Mark every chokepoint. On the traced primary route, mark every bridge, tunnel, mountain pass, ferry crossing, and single-lane segment. Mark any urban interchange that collapses into fewer lanes. Mark any border checkpoint or toll plaza on limited-access roads. Circle each one.

Step 4: For each chokepoint, identify the alternate segment. Using USGS topographic maps and county road atlases, find a path that goes around each circled chokepoint. The alternate segment does not need to parallel the primary route — it only needs to rejoin the primary route on the far side of the chokepoint. Verify the alternate exists at the map level; verify it is paved and passable by your vehicle.

Step 5: Identify no-alternate segments. Some chokepoints have no reasonable alternate within a practical distance. Mark these explicitly in your route notebook as "structural risk — no bypass within 30 miles (48 km)." When choosing between two primary routes to a destination, prefer the route with fewer no-bypass chokepoints, even if it is longer under normal conditions.

Step 6: Save all materials offline and on paper. Print route sheets with turn-by-turn notes and relevant map sections. Pre-download offline tiles for your routes in Avenza Maps or a comparable offline navigation app. A situation where every cell tower in your evacuation corridor is saturated — exactly the scenario that occurred in major hurricane evacuations — is not the time to discover your maps require a data connection.

Field note

Drive every alternate route in normal conditions at least once before you count it as real. The first thing you discover when you actually drive a "secondary road bypass" is whether it dead-ends at a locked farm gate, whether the bridge is weight-limited to 10 tons, or whether the "road" on the map is now a trail. Maps — paper and digital — go stale. The route you memorized from Google Street View three years ago may have a new locked gate today. One 90-minute scouting drive eliminates a category of failure that no amount of desk planning can catch.

Build your PAC — Primary, Alternate, Contingency

The PAC framework (Primary, Alternate, Contingency) is the operational standard for route planning when failure is genuinely possible. Three routes minimum from any critical origin to any critical destination. Each route must share as few chokepoints as possible with the previous route.

Primary route: The fastest route under normal conditions. This is what you use when conditions are normal and all roads are open. It likely uses major highways and efficient interchanges because those are fastest when they are functional. It probably has several chokepoints.

Alternate route: Bypasses the most likely-to-fail chokepoint on the primary. If your primary uses a major bridge over a tidal river, the alternate uses the next bridge upstream or a different river crossing. The alternate will often be slower under normal conditions. That is acceptable — it exists to function when the primary fails.

Contingency route: A completely separate travel corridor. Not just a different bridge — a different river, or a different side of the watershed entirely, or a different road network at a different cardinal direction from your origin. The contingency should share no chokepoints with the primary or the alternate. A contingency route that uses the same bridge as the primary but a different on-ramp is not a contingency — it is a variant. Identify this pattern and fix it.

Route notebook format

Keep a dedicated route notebook for each origin-destination pair. Each entry should include:

Route name (P = primary, A = alternate, C = contingency)
Total distance in miles (km) and estimated time under normal conditions
List of chokepoints with GPS coordinates or intersection descriptions
Alternate bypass for each chokepoint on this route (a brief turn description)
Structural risk segments with no bypass (flagged explicitly)
Decision-point locations — specific intersections where you commit to a route change
Key fuel, water, and rest stop references along the route

The route notebook lives in your vehicle, inside a waterproof sleeve. It does not live only on your phone.

Time-of-day decisioning

The correct departure window is determined by the threat, not by the driver's preference. This is the single most common planning error.

Daytime departure (roughly 6 AM–8 PM): Better visibility; more civilian services open (fuel, food, pharmacy); police presence higher; emergency communications easier to interpret using visual landmarks. Downside: most other evacuees are also departing in daylight, so traffic is heavier.

Nighttime departure (roughly 8 PM–6 AM): Reduced civilian traffic is a genuine advantage — the roads are measurably clearer. Disadvantages include reduced visibility for the driver, most fuel stations and services closed, navigation by landmarks harder in the dark, and mechanical failures occur in environments with no help available. If you drive a night alternate, you must have driven it in daylight first. Navigating a secondary road at 2 AM in an unfamiliar area that you have only seen on a map is a recipe for a wrong turn that costs 45 minutes in a situation where time is critical.

Pre-dawn departure (3–5 AM): Often the best compromise — you get the thin traffic window of nighttime departures while daylight arrives within 1–2 hours of the start of your drive. This timing gets you through the congested urban segment before morning rush builds.

Threat-specific timing rules:

Hurricane evacuation: The Federal Emergency Management Agency (FEMA) and state emergency management agencies consistently document that departing 48–72 hours before projected landfall provides the most reliable travel conditions. Waiting for the mandatory order means sharing the road with hundreds of thousands of simultaneous departures.
Wildfire evacuation: Opportunistic — the threat moves and the evacuation window may be measured in minutes, not hours. When the evacuation order arrives, depart immediately regardless of hour.
Flood/river flooding: Predictive — significant lead time is available for riverine flooding (24–72 hours). Use it. Pre-dawn departure before the flood event reaches its peak is the standard planning figure.
Civil unrest: Time-of-day choice is driven by observation, not a calendar. If unrest is building and your route is through an affected area, daylight and police presence are advantages. If the situation deteriorates quickly and night departure is safer than waiting, depart.
Winter storm: Snow plus dark is a significant risk multiplier. If you must drive in winter conditions, daylight is strongly preferred. Pre-storm departure before the precipitation begins is the standard guidance.

Decision rule: Choose the departure window based on the threat's timeline. If the threat closes to a 6-hour window, depart now regardless of whether it is 2 AM. A moderate inconvenience at departure is categorically better than arriving at a chokepoint simultaneously with the rest of the population.

Terrain-based shortcuts and secondary roads

Not every alternate route needs to be a different highway. In many regions, secondary road networks offer the most reliable evacuation corridors because they are not the roads everyone else is using.

Paved secondary roads parallel to major highways are the most underutilized evacuation asset. Many US highways have parallel state or county roads that cover the same corridor more slowly under normal conditions but avoid the highway-specific chokepoints (entrance ramp queues, merge bottlenecks, rest-stop congestion). Identify the closest parallel secondary road for each 30–50 mile (48–80 km) segment of your primary route.

US Forest Service (USFS) and Bureau of Land Management (BLM) roads can offer genuine bypass capability in areas where they parallel or cross highway corridors. The USFS Motor Vehicle Use Map (MVUM) system designates which roads are open to highway-legal vehicles — download the MVUM for your relevant national forests before you need it. Key constraint: USFS and BLM roads vary significantly in surface quality and clearance requirements. A standard passenger car can use many designated USFS roads. Others require high-clearance four-wheel-drive. Verify the designation and visit the road in person before counting it as a vehicle alternate. For vehicle capability requirements for secondary roads, see Vehicle selection for emergency use.

State and local park roads are frequently closed during emergencies when parks are themselves evacuation areas or when park administration closes access. Do not plan a route through a park that will be in the affected zone.

Local-knowledge sources often provide the best secondary-route intelligence: county emergency management websites (most counties publish emergency route maps), state DOT emergency routing designations, and local ham radio emergency nets. The Amateur Radio Emergency Service (ARES) nets — coordinated through the American Radio Relay League (ARRL) — routinely provide real-time road condition information during major events. Local net frequencies are published by ARRL section emergency coordinators; pre-program these into your radio before any event.

The no-shortcut rule: Do not rely on a road or trail you have never driven. The primary cost of discovering that your "shortcut" dead-ends at a locked gate or washed-out bridge is not the time you lost — it is the 20-minute (or longer) backtrack through traffic that is now behind you. Drive or walk every alternate in normal conditions before you count it as an option.

Field note

Secondary roads that cross into adjacent counties sometimes hit legal or physical access barriers — locked gates on private property that happens to cross between ownership parcels, or county roads that are maintained on one side of a county line but not the other. When scouting secondary routes, note whether any portion crosses private land, and note whether road quality drops abruptly anywhere (a paved road that turns to gravel at a county line may be impassable after rain). These are the details that only exist in the field, not on a map.

Vehicle vs. foot route divergence

Your vehicle route and your foot route to the same destination are often fundamentally different paths — and both need to be planned.

Vehicle route logic: Maximize speed. Use paved surfaces, highway corridors, and efficient interchanges. Accept infrastructure dependencies (bridges, tunnels) in exchange for distance efficiency. Your vehicle route exists in a world where the vehicle is working.

Foot route logic: Maximize route availability. Foot routes can use railroad rights-of-way, trails, stream corridors, and terrain that vehicles cannot access. Foot routes eliminate most infrastructure dependencies — you do not need a bridge if you can wade a shallow stream or find a log crossing. The tradeoff is time and physical effort.

Planning your foot route: For each critical origin-destination pair, plan a separate foot route that intentionally uses different terrain from the vehicle route. On USGS 1:24,000 topographic maps, identify trails, railroad rights-of-way (trail or track that is unobstructed), stream corridors, and ridge lines that offer a path without crossing infrastructure chokepoints. Download these maps from the USGS National Map Downloader at nationalmap.gov.

Walking distance realities:

Flat ground, light pack, fit adult: roughly 3–3.5 mph (4.8–5.6 km/h), sustainable for 4–6 hours
Loaded pack (25–40 lbs / 11–18 kg), mixed terrain, average adult: 2.0–2.5 mph (3.2–4.0 km/h)
Mixed terrain with hills and significant elevation change: 1.0–1.5 mph (1.6–2.4 km/h)
With children, elderly members, or injured members: plan to the slowest member, which may be 0.75–1.0 mph (1.2–1.6 km/h) over rough terrain

A 20-mile (32 km) foot evacuation at 2.0 mph (3.2 km/h) is 10 hours of continuous walking — well beyond a single day's effective range for most households with mixed fitness levels and pack weight. Factor this honestly. A foot route to a destination 40 miles (64 km) away is a 2–3 day commitment, not a single push. See Foot travel and walking routes for the full pace and fatigue planning methodology, and Urban bug-out without a vehicle for the urban-specific foot evacuation considerations.

The vehicle-to-foot transition point: Plan a specific location where you would abandon the vehicle and continue on foot if the vehicle becomes the chokepoint. This should be a place that offers:

Adequate vehicle security or an inconspicuous parking location away from the road
The start of your foot route — i.e., access to the trail, rail right-of-way, or terrain feature your foot route uses
Cover for loading and organizing your foot-travel kit

The transition point exists in your planning before you need it. The worst time to choose an abandon-vehicle location is when the vehicle has already broken down in the middle of a congested highway.

Foot route terrain navigation: For foot route navigation when digital tools fail, see Navigation without digital tools and Natural navigation techniques. Map and compass proficiency is not optional for foot route planning — if your navigation depends on a device that requires a battery or signal, your foot route plan has a single point of failure.

Real-time route choice under emergency

The planning exercise gives you three routes and a route notebook. The real-time exercise is knowing which of those three to use as conditions develop.

Three questions at every decision point:

Has my primary segment ahead failed? (Closure, gridlock, event blocking the road)
Is my alternate viable right now? (Open, passable, not also blocked)
Am I committing to this alternate, or is this a tentative shift I can reverse?

The third question matters because bouncing between routes costs time and fuel. A tentative shift to the alternate that you reverse 5 miles (8 km) later because of a wrong read puts you 10 miles (16 km) in the wrong direction — a 20–30 minute penalty in the best case. When you shift to an alternate, commit. Only reverse if you have positive confirmation that the alternate is also blocked.

Information sources during emergency:

NOAA Weather Radio All Hazards broadcasts on seven frequencies (162.400–162.550 MHz) continuously and interrupts for emergency alerts. A basic weather radio receiver handles this. This is your primary real-time information source when cellular and internet are unreliable.

AM/FM broadcast radio is your secondary source. Major AM stations in most metro areas coordinate with state emergency management for evacuation routing information. Pre-program your local state DOT emergency information station frequency — many states have a dedicated frequency that activates during major events.

ARES and local ham radio nets provide the most granular real-time road information. A licensed ham operator with a 2-meter FM transceiver can access local nets that report specific intersection blockages, bridge closures, and contraflow segment status. For the comms setup and frequency discipline that supports this capability, see Communications plan.

Cellular data and navigation apps: Expect degraded or unavailable data service in the first 6–24 hours of a major evacuation event. The towers become saturated quickly. Apps that require active data connectivity for routing will fail exactly when you most want them. This is why offline-downloaded maps and your paper route notebook matter. Avenza Maps with offline USGS overlays and Google Maps offline tiles (downloaded before the event) can function without a data connection.

Visual observation: Before committing to a route at a key decision intersection, pull off the road safely and observe traffic flow for 2–3 minutes. A road that looks clear ahead may be backed up past the next crest. A road that appears congested at the on-ramp may be moving freely 500 feet (150 m) in.

When to switch to the contingency: Activate your contingency route only when both the primary and the alternate are confirmed blocked or unacceptably slow. The contingency was planned for total primary-system failure, not for ordinary traffic delays. Reserve it for when you genuinely need it — once you have committed your contingency route, you have used your entire planned buffer.

For threat-specific route selection triggers and communication protocols during civil unrest scenarios, see Civil unrest preparedness. For hurricane and wildfire-specific timing triggers, see Hurricane preparedness and Wildfire preparedness. For winter storm route constraints, see Winter storm preparedness.

Vehicle-stranded contingency

When your vehicle becomes the chokepoint — breakdown, accident, fuel exhausted, impassable road condition — execute this sequence:

Step 1: Assess your immediate situation. Is the vehicle in danger (fire, rising water, compromised structural support)? Is the road around you actively dangerous (ongoing accidents, crowd pressure)? If yes, exit the vehicle immediately. If no, stabilize before acting.

Step 2: Retrieve your go-kit from the vehicle. Before you abandon the vehicle or wait for help, retrieve your personal carry-out kit — documents, cash, medications, communications gear, and your 24-hour walking kit. Load it while the vehicle is still a stable work surface.

Step 3: Assess the realistic timeline. Is this a temporary blockage you will clear in 30–60 minutes? Or are you looking at a situation that will not resolve for 6+ hours? If the answer is "6+ hours" or "unknown," treat it as an extended stay or a vehicle-abandon situation, not a temporary wait.

Step 4: If sheltering in the vehicle, make the vehicle as conspicuous as possible (hazard lights on, hood up if mechanical). Keep the windows cracked. Monitor for carbon monoxide if running the engine in a confined space. See Vehicle breakdown procedures for the full shelter-in-vehicle protocol.

Step 5: If abandoning the vehicle, move to your foot transition point (planned in advance) or to the nearest viable cover away from the active roadway. Activate your foot route. Notify your communications contacts of your last known location using whatever channel is available per your communications plan.

24-hour walking kit (pre-staged in vehicle): This is the gear you take when you leave the vehicle on foot. It is not your full bug-out bag — it is the subset you can carry without slowing your pace to an unsustainable level. See Get-home bag for the full kit list and weight discipline guidelines. See Vehicle emergency kit for what stays staged in the vehicle at all times.

Tools and substitutes

Ideal tool	Specs / sizing	Field-expedient substitute	Notes / limits
USGS 7.5-minute topo map	1:24,000 scale; covers ~6×9 mi (10×14 km) per sheet	State DOT highway map at 1:100,000 or smaller	DOT maps lack terrain detail; use topo for foot routes, DOT for vehicle routes
County road atlas	Paper, current-year edition, covers full county	OpenStreetMap printed on demand	OSM data is crowdsourced; verify critical roads against official county/DOT source
Offline navigation app with USGS overlay	Avenza Maps with downloaded USGS tiles; or Gaia GPS	Google Maps offline tiles (downloaded before event)	Google offline tiles expire and do not include terrain contours; USGS overlay preferred for foot routing
NOAA Weather Radio receiver	Dedicated standalone unit (VHF 162.400–162.550 MHz)	AM/FM radio for broadcast alerts	Dedicated weather radio is faster; AM/FM requires the local station to be broadcasting route info
Ham radio (2-meter FM transceiver)	Licensed; pre-programmed with local net frequencies	FRS/GMRS radio for short-range peer comms	Ham nets provide road-condition information; FRS/GMRS does not access those nets
Route notebook	Waterproof-paper notebook in a dry sleeve	Laminated route card with handwritten notes	Laminated card does not accommodate route changes; notebook is more adaptable
Pencil + ruler	Waterproof pencil, clear ruler for distance estimation	Ballpoint pen (waterproof ink preferred)	Pencil survives rain and cold; ballpoint ink can smear when wet

Failure modes

Single-route planning. Operator error: only one route mapped to the destination. Outcome: that route fails at a chokepoint, no alternate exists, driver is now improvising under pressure. Recovery: recognize the failure mode before the event by auditing your plan — if you can only name one way to get somewhere, that is a planning gap. Fix it at the desk, not at the chokepoint.

Routes sharing too many chokepoints. Operator error: alternate and contingency routes were mapped with different starting paths but both cross the same bridge or use the same tunnel. Outcome: the chokepoint closes, and all three routes fail simultaneously. Recovery: audit each route pair explicitly — list the chokepoints on each route and check for overlaps. If primary and alternate both cross the same river on different bridges, that entire river crossing corridor is a shared vulnerability — revise.

Alternates never driven. Operator error: the alternate route was mapped on paper or screen but never validated on the ground. Outcome: the alternate is blocked by a locked gate, a weight-limited bridge, a private road, or a segment that was unpaved on the map but is actually a muddy track impassable by a standard vehicle. Recovery: treat any unmapped alternate as unverified until driven. Schedule alternate-route familiarization drives annually, or whenever a route is first planned.

Map confidence higher than reality. Operator error: trusting an outdated map for a road that has changed since the map was printed or last updated. Digital maps are generally more current, but USGS printed topos are updated on irregular cycles — verify the edition date printed on the map. County road networks change. Recovery: verify paper map dates when acquiring them; re-download digital map tiles at least annually.

Device dependency with no offline backup. Operator error: entire navigation plan lives on a phone or GPS unit with no paper backup. Outcome: device battery dies or cellular network is down, navigation is completely lost. Recovery: paper route sheets in a waterproof sleeve are non-negotiable. Devices are a supplement, not a replacement.

Time-of-day chosen for driver convenience, not threat. Operator error: departure delayed because it is inconvenient — waiting until morning, waiting for a meal, waiting for children to finish school. Outcome: the threat closes to a dangerous window during the delay; the driver departs into the surge. Recovery: departure triggers must be pre-defined and treated as non-negotiable commitments. See Bug-out planning for trigger-definition methodology.

Foot route not planned. Operator error: vehicle routes are fully planned, but no foot route exists. Outcome: vehicle becomes the chokepoint (mechanical failure, gridlock, fuel), and the transition to foot travel requires improvising direction, distance, and terrain on the spot. Recovery: plan foot routes as a separate exercise from vehicle routes. They require different maps (USGS topo) and different reference points (terrain features, not road signs).

Route-planning checklist

With your routes mapped, your next planning layer is the departure trigger discipline in Bug-out planning and the go/no-go decision framework in Evacuation planning. For the navigation skills that make foot routes reliable when devices fail, see Map and compass navigation and Natural navigation techniques.

Sources and next steps

Last reviewed: 2026-05-25

Source hierarchy:

FEMA Federal Evacuation Support Annex, April 2025 (Tier 1, federal emergency management)
FHWA Evacuation Transportation Management Guide (Tier 1, USDOT federal)
USGS National Map Downloader — Topographic Maps (Tier 1, federal geospatial authority)
NOAA Weather Radio All Hazards (Tier 1, federal)
USFS Motor Vehicle Use Map Program (Tier 1, federal)
ARRL Amateur Radio Emergency Service (ARES) (Tier 2, established technical organization)

Legal/regional caveats: Route planning is a planning activity with no direct legal constraints in the United States. Access to USFS and BLM roads is governed by designated-use rules under 36 CFR Part 212 (USFS) and BLM administrative policy; check current MVUM designations for any off-highway route. Contraflow and official evacuation route designations override all personal route plans during declared emergencies — always comply with official routing instructions when they are issued.

Safety stakes: high-criticality topic — recommended to verify current road conditions and local evacuation routing with local emergency management before acting.

Next 3 links:

→ Bug-out planning — departure triggers, destination selection, and go-bag load discipline
→ Evacuation planning — zone tiers, go/no-go decision framework, and shelter-in-place assessment
→ Navigation without digital tools — map and compass procedures when devices fail during travel