What is the name of the 1990's movie where 4 guys get lost in LA and get attacked by a gang?

back in the 1990's there was a movie which featured a bunch of guys renting an RV and going to a basketball game in Los Angeles. Somewhere along the way to the game, they took a detour around traffic and got stuck in unfamiliar territories which was heavily gang infested. They ended up getting attacked by the gang and abandoning their RV (it was set on fire by the gang) and fleeing through the sewers and alleys of the city. I think all but one of the guys got killed off. Anybody remember the name of this movie?