I know its hard to prove, but its possible to get him in a fair amount of trouble for throwing an obstacle in the road. The guy sounds like a meanie greenie... its fun to irritate them.
I considered calling the police on him... but as you said, i couldn't prove it.. and i was rushing to get to work ontime...
I understand (and even appreciate) the fact he wants to bike to work... its good on the gas bills and good exercise, but to have to drive down a 4 lane country road, and expect people to "get their exhaust out of his face" is rediculious... Also, i really don't expect him to be accident free for long... as his "I am a bike, get outta my way" attitude wont last...
