First, you have to place down a "civilian settlemant" module anywhere on the map (you should probably put it in Agia Marina).
1. To get the "auto jede" message, go to the outskirts of the module's range that you set (default is axis A: 50, axis B: 50).
2. It is rare for trucks to spawn inside of things, but if you keep going into the mission it will eventually happen.
3. To see the trucks in the middle of the road, just look around (it won't happen all the time).
4. To see the civilians crawling, also just look around (it won't happen very often).