Continuity mistake: When Axel elbows the guy in the face at the strip club you can see his elbow not even hitting the guy's face.
Continuity mistake: When the semi crashes into the fruit truck you see the impact, but the camera angle changes and you see the semi hitting the truck again.
Answer: There might be a deleted scene showing an extended chase scene, but as it is, it seems out of place. From what I can tell, the road was slick, like something oily was spilt on the road during the chase. I don't think it's from the fruit and vegetable truck either. The bus looks like it's breaking suddenly (perhaps to avoid an unseen wreck) and skidded out and the driver over compensated, spinning the bus out. In fairness, a licensed bus driver would probably be able to control the bus in that situation, so it was exaggerated for the film. It probably should have been cut, but I'm guessing someone liked it and kept it in for more action.
Bishop73