Mass Ai Avoidance of Vehicle Pawn not working

Hi,

I noticed that the City Sample Mass AI Traffic is not responding to my custom vehicle pawn(based on the vehicle template)
The crowd and the vehicles are not braking but crash into it. How do i get mass ai to brake or move around my pawn.
I noticed it works with city samples player BP and with ai controlled cars on ai controlled cars so i guess there should be a way. I tried coping over the mass agent from the city sample default player character to my vehicle and the collision cylinder but this does nothing.