I played this as a kid on the PS3 compilation of Genesis games that was around then. I remember enjoying it but also never getting past the level with the music theme. I remember the music in general being pretty good. I don't really feel like going back to play it again.
This game rules. One of the characters is a photographer for her high school's newspaper who attacks by blinding people with her camera's flash. Every character can punch people thirty feet up into the air and start doing air combos. There are separate throws for if you're standing or crouching, and crouching throws will always land if you're in range. This game's like if Marvel Vs Capcom had 3D fighting game sidestepping and you never had to play as your assist characters if you didn't want to. This is a great game to bring to your local fighting game events because it's hilarious but also has enough to it that you can take it seriously as a fighting game.
The acceleration feels bad and the camera is pretty mean. But Speed Highway is fun and the music is generally pretty good. I get why people would've gone nuts for this back when it was new, but I'm too used to the improvements to video games that were made after this game came out.