[Twisted_Insane]

Create a command for it, and simple set the values binary to '0':

pawn Код:

if(IsPlayerInAnyVehicle(playerid))
        SetVehicleVelocity(GetPlayerVehicleID(playerid), 0.0, 0.0, 0.0);

It's just an example, you could put it into a command to set the vehicle to it's default velocity!