OutRun was released in 1986 and became the go-to game for making driving games. In 2006, a sequel was released in Arcades by the name of OutRun 2. Further editions would be SP and SDX.
The reason why it's called SP SDX is that it stands for SPecial Tours Super DeluXe. It means that rather than being on the slower Chichiro hardware, it now runs on the much faster Lindbergh arcade boards, which makes the game faster, run better and ups the resolution to 800x480. Other changes include the much larger cabinet, which allows 4 players to play at once.
In addition to the 4 player cabinets, there's still more. The game now features a raceview camera focused on the players, as well as live leaderboard in the 4 player mode. Also, it features a 2 player co-operative game, where 2 players share the same car and drive it around a course co-operatively, switching out when they crash. Each player has their own set of controls and pedals.
If your local arcade has a copy of this machine and you're a fan of the OutRun series, it might be worth putting a credit or two in and giving it a whirl. I did and I really enjoyed the classic OutRun mode, Heart Attack Mode and Time Attack, where players can try and beat the previous best racers.