Thanks for the feedback!
The rules were in fact somewhat confusing (which was kind of the goal -- the likes of the laws). We were in the process of implementing feedback on actions, but failed to implement feedback for the rewards system :/. We were hoping that the reward system would let you know which bikes were illegal bikes, and which ones weren't, solidifying your comprehension of the rules/laws.
Regardless, I hope you enjoyed your experience, and hopefully you'll get to play our next one :)