City Sample change Default Pawn to Custom Vehicle interactable with traffic.

I am trying to change the default possessed pawn in the city sample from the BP_CitySamplePlayerCharacter, with the Default Controller, to a deformable traffic interactable vehicle when the game is started.

Currently, changing the default pawn to any one of the 13 vehicles allows me to possess that vehicle at EventBeginPlay, but this possessed vehicle does not interact with the default traffic system, causing other cars to crash into the currently possessed vehicle.

I would also like to know how i can create my own vehicle with a custom mesh, custom physics parameters, and components, but make it interactable with traffic and the default PlayerCharacter.