Gas taxes should be immense - make gas go back to $4 a gallon.
The proceeds can go to:
1) improving & encouraging public transportation
2) streamlining places where traffic slows to a crawl (it still amazes me how there are intersections that take 8 minutes to get through, such as near to me.) That is a LOT of idling and wasted time.
3) providing a basic insurance, which takes away some of the uninsured motorist problem, and would fall more heavily on people who drive more, drive bigger (more dangerous to others) vehicles, etc.
4) encouraging people to switch to energy-saving vehicles (hybrids, etc.)
5) alternative energy research, etc.
5) more expensive driving reduces our imported oil needs, etc....