Toll temptations.

• Position: TRENDS AND TRANSITIONS - Transportation funding

With greater frequency, state lawmakers are looking at toll roads both public and private--as a potential source of revenue for needed transportation improvements. Significant growth in population, travel and freight movement have increased transportation demands and widened the gap between the amount necessary to improve the surface transportation system and the amount states can spend. By 2015, the national cumulative transportation funding deficit from all levels of government will reach S1 trillion, according to a 2005 report published by the National Chamber Foundation.

Much of the problem can be traced to shrinking revenue. Motor vehicle fuel excise taxes, a transportation funding staple, have not kept up with inflation. With soaring gas prices, gas tax increases are politically unpalatable. In fact, following Hurricane Katrina, Georgia temporarily suspended its gas tax. New York capped its gasoline sales tax this year, and several other states considered similar proposals.

Given this funding climate, more states are looking at tolls. Nationally, toll revenues are up 36 percent since 1998, and toll roads and bridges are operating in at least 31 states...