Trivia: During the scene where Zhang Zhiyi gets knocked out and Chris Tucker calls her, "a crazy a$$ b&%*h", that take was taken around 20 times due to the fact that Tucker was very conservative in trying to make up something to insult Zhang Zhiyi but not too bad. The director finally pulled Tucker aside and convinced him that he HAD to say something very insulting because of Zhang's character. And that's how the last take and the final cut for the insult was done.
Trivia: Notice in the scene where Carter and Zhang Ziyi are fighting. Zhang tries to stab Carter, but he blocks it with a roulette wheel. She stabs the Green 00. Lucky, eh?
Trivia: In the scene where Chris Tucker and Jackie Chan are running on the highway with trash can lids covering their unmentionables, they really had to do that. There was no way to close the highway so they had to run on the highway with actual people in the cars....not just extras or empty cars.
Trivia: Zhang Ziyi's part was originally written to be a male character.
Trivia: Don Cheadle agreed to be in the film, but only if he could fight Jackie Chan. His scene was then re-written to accommodate his request.
Answer: Although it's never shown, it was probably Ricky Tan's henchmen. Lee and Carter were outnumbered and decided to give up. After the fight, they were dropped off in the middle of a busy highway with no clothes on as a way to add insult to injury.