Watch the following videos to see how the cars work.
https://www.youtube.com/watch?v=cqdNryuPvpQ
https://www.youtube.com/watch?v=2ije61-qCqA
https://www.youtube.com/watch?v=oUT9uaAqOTk
https://www.youtube.com/watch?v=JpGMYxU218M
