Times are changing
Fuel efficiency has improved.
Fuel efficiency has risen significantly since 1975 and is at an all time high for both cars and trucks.
Source: U.S. Environmental Protection Agency, Fuel Economy Trends Report 2015
Inflation has eroded revenue.
Congress last raised the federal gas tax from 14.1 cents per gallon to 18.4 cents in 1994. Adjusted for inflation, the current gas tax rate is 11.5 cents in 1994 dollars—nearly 3 cents less than what it was before Congress raised it.
Sources: U.S. Bureau of Labor Statistics U.S Bureau of Economic Analysis
Congestion has increased.
The number of hours a motorist spends in traffic jams has doubled since 1982, and about 45 percent of federal highways and major roads in the U.S. are not in good condition.
Sources: 1. Texas Transportaion Institute 2. U.S. Federal Highway Administration