To unlock this trophy, you have to get hit by a vehicle on the following 5 levels. Can be done in any mode.
-Downtown (THPS1 - taxis driving around)
-Streets (THPS1 - any of the vehicles or the trolley driving around)
-School 2 (THPS2 - the golf cart)
-New York City (THPS2 - taxis driving around)
-Philadelphia (THPS2 - bus driving around the outside)