States are taking it upon themselves to raise revenues for roads and mass transit as federal lawmakers remain stymied on long-term highway funding.
An Associated Press review found that one-fourth of the states have enacted transportation funding increases in the past year and a half, and at least a dozen others are studying it.
Missouri voters will decide Tuesday whether to impose a three-quarters cent sales tax for transportation.
The push for more funding comes as revenues from federal and state fuel taxes are deteriorating because of more fuel efficient cars, a decline in per capita driving and stagnant tax rates.
Congress recently approved a 10-month patch for its highway trust fund but still has not addressed a long-term transportation funding plan.