This is a put together and demonstration of the features for the Hot Wheels Road Race Playset (I can't remember exactly what the name of this set is, so if anyone knows, please leave a comment).
The 1970 Hot Wheels Rod Runner Speedway Set lets you run “lap after lap” action on an oval using a single-lane rod runner. To take things one step further, Mattel added a Tune-Up Tower and produced the Hot Wheels Road Trials Set.
The most breathtaking part is that the toy car just works on its own from the tunnel to tunnel without any external force, as it has been entirely powered by gravity at all the time. The total ride along the 200 feet track has been recorded over two minutes in this stunning video for you to watch and enjoy the hot wheels road trip.