I was actually a Civil engineer for the state DOT for 34 years. The last state increase was 1987 and the last federal increase was 1994. Local roads are just that a local matter. Basically the state revenue intake for the DOT is the same as the late 1990s, more efficient vehicles overrode the increase in miles travelled and the increased number of vehicles. A ton of installed asphalt paving had increased in cost from circa 35 dollars a ton to between 80 and 100 by the time I retired in 2016. Similar increases occurred in the price of cement used in paving, drain pipes, and bridges. More funding is needed as the longer between resurfacing a road, the more extensive the amount of repairs needed are. Now I would suggest constitutional amendments requiring road taxes be used solely for the purpose of road and bridge repair and construction and forbidding shifting of those funds to other agencies under penalty of law. Such shifts were frequent and extensive after the crashes in 2001 and 2008. Math hurts but it doesn't change.