gps based tolls not worth the effort (Score 1)

A tax on gas is better than a toll based on mileage for several reasons. First, a per-volume tax on fuel encourages the use of fuel efficient vehicles, which is obviously a good thing. Second, using gps to calculate peoples mileage and tolling them based on that would require an entire new infrastructure including a massive billing department and a device in every vehicle. Also, by switching to a gps based system, you open up the opportunity for creative people to hack some kind of workaround to thier billing and tracking system to avoid payment.