Planning Your Fallout Evacuation Route

Check your distance from the detonation: if within 10-15 km with a large yield, stay sheltered unless completely exposed. If 15-50 km away, prioritize sheltering in place in a basement or multi-story building center for 24+ hours—fallout arrives within minutes and evacuation routes will be heavily contaminated. Evacuation becomes necessary only if beyond 50 km OR your current location has inadequate shelter (single-story building, outdoors, or confirmed contamination).

Never evacuate downwind from the detonation—fallout particles travel with wind and will intercept your route. Check weather forecasts or emergency broadcasts for wind direction, then plot evacuation routes perpendicular or upwind away from the contamination plume. Mark secondary roads (not highways) that bypass population centers where congestion and radiation hotspots accumulate. Crosswind or upwind travel minimizes fallout exposure by avoiding the primary contamination zone.

Set a minimum target of 50-100 km from the blast site (further for yields >1 megaton). Identify a specific destination town or region upwind of detonation that exceeds this distance. Verify the route beforehand on a map; identify multiple alternate roads in case primary routes are blocked by congestion or contamination. Plan refueling stops and rest areas where shielding is available. For families, confirm your destination has shelters, water, and medical facilities.

Always evacuate by vehicle if available—your car provides 50-95% radiation shielding depending on vehicle type (metal and water are best shields). Foot evacuation leaves you fully exposed to fallout particles. Keep fuel at ¾ tank minimum during nuclear tensions. Drive secondary roads to avoid highway congestion and radiation hotspots. Keep windows closed and ventilation on recirculate mode to block airborne fallout from entering the vehicle. Minimize time outside the vehicle during evacuation.

The 7-10 rule: radiation intensity decreases by 10× every 7 hours. Evacuating within the first 7 hours means peak contamination exposure; waiting 7 hours reduces it 10-fold; waiting 14-24 hours reduces it 100-1000 fold. If forced to evacuate early, minimize outdoor time and use vehicle shielding. If shelter is tenable, waiting 24 hours before evacuation dramatically reduces radiation exposure and makes the route safer. Plan evacuation timing around this decay curve.

During evacuation, track dosimeter readings and emergency broadcasts for radiation intensity and contamination zones. Evacuation becomes untenable when radiation exceeds ~1000 mrem/hour or symptoms develop (nausea, vomiting, severe burns). At this point, return to nearest shelter immediately—further travel is lethal. Stay tuned to emergency radio for updated wind patterns, safe corridors, and traffic conditions. If roads are gridlocked in radiation zones, shelter nearby rather than idle in contamination—motion and distance matter more than speed.