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Frontage Roads

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I have travelled through Texas, and noted the large used of frontage roads.  I'm wondering what the intended purpose of them is, other than providing more through lanes of traffic.  Is there a reason even older freeways were built with them?  It seems that they're simply used as extra mainlanes, but maybe I'm wrong.

Frontage roads provide direct access to homes and businesses that freeways do not.  In most cases, frontage roads are created when a mainline road is upgraded to limited-access status. A good example in the state of Florida is U.S. 19 in the Clearwater/Dundedin area. The mainline arterial is being upgraded to expressway status, complete with SPUI interchanges along secondary arterials.  Since this area was already inundated with commercial businesses, building the expressway in the same location would instantly cut them off the mainline.  Solution: build frontage roads on each side (in this case one-way frontage road pairs) to provide direct access to those businesses, and also providing access to the secondary arterials at the SPUI interchanges with slip ramps stratigically placed along the mainline of U.S. 19.

That is just one example of the usage of frontage roads.  I'm sure more of you can elaborate on this subject.

Another example is I-90 in Central Washington. North and South Frontage Roads are their names

When I-595 was built in the late 1980's into the 1990's, it was built with frontage roads that provided the local access that the previous arterial, FL-84, originally provided.  The frontage roads are still considered FL-84.

In some areas, frontage roads are used at specific interchanges to separate the weaving traffic movements from the through traffic at cloverleaf interchanges.

rawr apples:
Detroit has these all over. Though they are called 'service drives'


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