Your article on the gas tax and our deteriorating roads and bridges is right on the point ("The toll on U.S. roads," May 13).

Our infrastructure — roads, bridges, tunnels, ports, water/waste systems — are rated by the American Society of Civil Engineers every four years. The 2013 Report Card gave our infrastructure an overall rating of D+.

The cost to bring infrastructure back to a "good" condition is estimated at $3.1 trillion. The emphasis on the gas tax and its impact on the public has certainly been overplayed by politicians who seem to be averse to any increases in any taxes — even those on the 1 percent.

And the public moans whenever the news reports the price of gasoline going up. I'll bet that many of these same drivers can be seen barreling up Interstate-83 at 80 mph in the morning and traveling on the Beltway at 70.

In my car I have an instrument that gauges miles per gallon as one drives. At 60 mph it may register 28-30 gallons per hour, but press on the gas and go up to 70 mph and mileage decreases to about 20 miles per gallon.

It is evident that keeping within the speed limit is one way to counter the high price of gas. Particularly for those on a budget, scaling back their speed will allow them to get better gas mileage.

Why hasn't this simple message been ingrained in drivers? If it had, we might have seen an increase in the gasoline tax years ago, and just possibly our infrastructure today might have achieved at least a sensible C rating.

Sidney M. Levy, Baltimore

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