[rbadaro]

Average speed check zones. Multiple cameras that identify your car and ensure your average speed between point to point is not above the legal limit. Sure, you can go above the speed limit and then slow down, but it would be a pain to have to slow down, specially if you put cameras the entrance and exit of service stations in highways to discount breaks.

[kawfey]

This would be a crazy revenue boost for metro areas outside of rush hour, where interstates are typically 55mph zones, while the traffic collectively moves at 65-70mph; going any slower than the flow is dangerous, but it's a dilemma to risk a ticket or risk a rear-ender.