These plans are looking out 50 plus years. Do you honestly think mpg will be the same in 10, 25, 50 years.
Every car on the road in Texas today will be replaced by the time TTC 35 is completed.
" Every car on the road in Texas today will be replaced by the time TTC 35 is completed."
Yes, but there is plenty of time to deal with that problem.
As I mentioned to you on an earlier post, it would only take a year (at the most) to put up toll booths on existing freeways, if gas mileage improved so much that the gas tax was insufficient. There is no problem adding tolling. Also, by the time cars are replaced, whether we like it or not, all cars will have a tracking system, so per mile tolling could also be imposed - and virtually overnight.
You're trying to solve a problem that is nowhere near existing yet.
I'll vote no on the gas tax.... Heck I don't won't to pay more for all my mileage around Texas most of which will never be on these tollways.... Let the toll uses pay when they cruising at 85mph.