Stay in the car. Lock the doors and windows and dont run anyone over. Really? That’s the “expert” advice? Any advice on what to do when the windows are broken, they pull you out of the car and beat you with a brick?
First Rule of Convoy: Never stop.
Yes.
Stay calm. Do not antagonize them. Say "Please" and "Thank You!" when appropriate. Apologize for being white if you get an opportunity. Don't use any racially tinged language as it can hurt feelings. Succumb quietly and without anger. Rest assured the authorities will be along in a day or two to collect your body parts and bring the offenders to justice!
See? That was easy!