You might keep in mind the prevailing (and current) wind directions for an industrial or major HazMat tanker truck or RR car accident, as wind direction will greatly affect your escape route.

I live less than half a mile from a state highway and just a bit further from a RR crossing, and the RR tracks run parallel to the highway for several miles.

I work near RR tracks these days, and it's a real eye-opener as to what is moving through our neighborhoods. Many of the tanker cars on the RR are labeled, but I don't think the tanker trucks carry much more than placards of hazardous materials. Hazardous gases like chlorine, ammonia, LPG, etc travel the roads and rails every single day.

Having a NOAA All Hazards Weather Radio that will turn on automatically when trouble erupts, and can make the difference between living and dying.

If you know something is happening, don't wait for an evacuation alert, just find out which way the wind is blowing and get out. Most hazards of this type are temporary, so you just need to get everyone out. The contents of a ruptured chlorine tank (for example) will usually disperse in less than 24 hours, depending on weather conditions.

Just don't have one bugout plan and direction to run. If you always say, "Oh, if we have to leave the house, we'll just go to Aunt Irma's farm", don't be so locked in to that plan that you can't/won't recognize that you would be heading straight into danger. Be mentally agile enough to determine which WAY to run.

Sue