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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

U.S. Route 3 and 20 in Boston Mass.

The interstate highway system, when completed and improved, will include only about 1 percent of the Nation's roads and streets but will carry 20 percent of the total traffic. Many sections os the system now are as congested as US Routes 3 and 20 in Boston, Mass., shown here

The interstate highway system, when completed and improved, will include only about 1 percent of the Nation's roads and streets but will carry 20 percent of the total traffic. Many sections os the system now are as congested as US Routes 3 and 20 in Boston, Mass., shown here.

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