stock IsVehicleDrivingBackwards(vehicleid)
{
    new Float:Float[3];
    if(GetVehicleVelocity(vehicleid, Float[1], Float[2], Float[0]))
    {
       GetVehicleZAngle(vehicleid, Float[0]);
       if(Float[0] < 90)
       {
          if(Float[1] > 0 && Float[2] < 0) return 1;
       }
       else if(Float[0] < 180)
       {
          if(Float[1] > 0 && Float[2] > 0) return 1;
       }
       else if(Float[0] < 270)
       {
          if(Float[1] < 0 && Float[2] > 0) return 1;
       }
       else if(Float[1] < 0 && Float[2] < 0) return 1;
    }
    return 0;
}