multVehicleSpeed(MultValue := 1.01, SleepTime := 10, MaxSpeedX := 2.0, MaxSpeedY := 2.0)
{
    if(multVehicleSpeed_tick + SleepTime > A_TickCount)
        return false
    multVehicleSpeed_tick := A_TickCount

    if(!checkHandles())
        return false
    if(!dwAddr := readDWORD(hGTA, ADDR_VEHICLE_PTR))
        return false

    if(!MultValue)
    {
        writeFloat(hGTA, dwAddr + ADDR_VEHICLE_X, 0.0)
        writeFloat(hGTA, dwAddr + ADDR_VEHICLE_Y, 0.0)
        return true
    }

    fSpeedX := readMem(hGTA, dwAddr + ADDR_VEHICLE_X, 4, "float")
    fSpeedY := readMem(hGTA, dwAddr + ADDR_VEHICLE_Y, 4, "float")

    if(abs(fSpeedX) <= MaxSpeedX)
        writeFloat(hGTA, dwAddr + ADDR_VEHICLE_X, fSpeedX * MultValue)
    if(abs(fSpeedY) <= MaxSpeedY)
        writeFloat(hGTA, dwAddr + ADDR_VEHICLE_Y, fSpeedY * MultValue)

    return true
}