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Interstate Frontage Roads

To which System do they belong?

FHWA frequently is asked whether interstate frontage roads are included in the Interstate System or the National Highway System (NHS).

The general answer is "no."

However, there are a number of cases where a partial exception to, or expansion of, or addition to this answer is appropriate.

Important partial exceptions include the following:

Important expansions to the general answer include the following:

Important additions to the general answer include the following:

The FHWA realizes that this answer may be disappointing in that some people feel the answer to the question "Are Interstate frontage roads part of the Interstate or the NHS?" should be short and simple.

However, the fact is that the answer must take account of textual differences in different parts of highway statute and regulations, the real world function and operation of frontage roads and other factors.

Updated: 6/20/2013
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