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A freeway is defined as a divided highway with full control of access and two
lanes for the exclusive use of traffic in each direction.
Freeways were originally intended to serve longer trips of generally regional
and interurban character.
Traffic on freeways differs from that on city streets and rural roads in that
it moves at higher speeds (depending on traffic conditions, design standards,
etc.), more smoothly, and at much larger rates of flow.
Speed limits are generally higher on freeways, and are occasionally
non-existent.
Because higher speeds reduce decision time, freeways are usually equipped with
a larger number of guide signs than other roads, and the signs themselves are
physically larger.
Guide signs are often mounted on overpasses or overhead gantries so that
drivers can see where each lane goes.
Access to freeways is typically provided only at grade-separated interchanges,
though lower-standard right-in/right-out access can be used for direct
connections to side roads.
This chapter basically describes the capacity and level of service.
Later weaving phenomenon in has been described.
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