function spawnCars(event)
    print("spawnCars")
    if flag == false then
        createCars()
    end

    if event.phase == "began" then
        print("began")
        collidedCars[#collidedCars + 1] = event.other
    end

    if event.phase == "ended" then
        print("ended")
        collidedCars[#collidedCars] = nil
        createCars()
    end
end