Something to think about during any major evac ... Elevated freeways are perfect kill zones Elevated freeways, bridges and many other highway system designs are perfect for trapping a target rich environment. LE response will also be delayed by the traffic that backs up outside the trap.

I like Dagny's idea to bug-in and let the heavy traffic clear out. Once you start to move you need to be assured there's a relatively clear shot to your destination.