Even if the titlescreen says '1990', the game was released in February 1991 in Japan.
Also released as "Rad Mobile [Upright model]
Rad Mobile was Sega's first 32bit arcade game.
Sega's legendary game mascot, Sonic The Hedgehog, is shown in this game dangling from the player's rear view mirror. This is actually the first time Sonic ever appeared in a video game.
Pony Canyon / Scitron released a limited-edition soundtrack album for this game (Formula : G.S.M. Sega 5 - PCCB-00059) on April 21, 1991.
A Rad Mobile unit appears in the 1992 movie 'Encino Man'.