Last
week brought with it a flurry of news stories discussing the issue of
how to pay for transportation infrastructure. This topic is never too
far from the agenda in statehouses across the country, in large part
because most states fund their infrastructures primarily with a
fixed-rate gasoline tax (levied as a specific number of cents per
gallon) which inevitably becomes inadequate over time as inflation
erodes the value of that tax rate. What's more, with fuel efficiency
becoming an increasingly important criterion in Americans' car-buying
decisions, drivers are able to travel the same distance while
purchasing less gasoline, and paying less in gasoline taxes.
With all this in mind, Mississippi's top transportation official last week publicly stated
that the state's lawmakers need to increase their flat 18.5 cent per
gallon gas tax rate. As evidence of this need, the official also noted
that 25% of the state's bridges are deficient.
In a similar vein, one recent op-ed
in Michigan called for increasing the state's gas tax and restructuring
it to prevent it from continually losing its value due to inflation.
Another op-ed
ran in the same paper that day, this one written by the President of
the Michigan Petroleum Association, insisting that the state eliminate
the gas tax altogether and pay for the lost revenue with increased
sales taxes. The most obvious flaw with this plan is that it would
shift the responsibility for paying taxes away from long-distance
commuters and those owners of heavier (and generally less
fuel-efficient) vehicles -- despite the fact that these are precisely
the people who benefit most from the government's provision of roads.
More news coverage
of the transportation issue came out of South Dakota last week, where a
committee of legislators is currently in search of additional revenue
to plug the hole created by predictably sluggish gas tax revenues.
While some have expressed an interest in raising the gas tax, others
have suggested replacing it entirely with hugely increased licensing
fees. But licensing fees are not as capable as the gas tax in charging
frequent and long-distance drivers for the roads they use.
The
best way to ensure that those drivers pay for the roads they use,
however, is to simply levy a tax on each mile they drive (known as a
"vehicle miles traveled" tax, or VMT). While the idea has yet to be
implemented in practice in the U.S., recent coverage of a pilot project involving 1,500 drivers in New Mexico shows that
such a tax is a very real possibility in the future. Basically, a
small computer is installed in each car which keeps track of the number
of miles driven. That information is then reported to the tax
collection agency, and the driver is sent a bill.
This
method avoids the scenario in which drivers of vehicles of similar
weights (which produce similar wear-and-tear on any given road) can end
up with vastly different gas tax bills due differences in fuel
efficiency. Interestingly, this new study is examining a system that
would allow the computer to know which state somebody is driving in, so
that the correct amount of tax can be paid to the correct state.
Unsurprisingly, despite the public finance appeal of this method,
privacy concerns remain a major obstacle to implementation.