![]() In urban areas, there should be no driveways or other access points to adjacent properties along the crossroad for at least 100 feet (30 m) from entrance and exit ramps, in both directions, and for at least 300 feet (91 m) in rural areas.Interchanges should be spaced at least 1 mi (1.6 km) apart in urban areas and 3 mi (4.8 km) apart in rural areas collector/distributor roads or other roadway configurations that reduce weaving can be used in urban areas to shorten this distance. Interchanges are to provide access to and from both directions of the highway and both directions of the crossroad. Controlled access: All access onto and off the highway is to be controlled with interchanges and grade separations, including all railroad crossings.Side clearances were reduced from the recommended 44.0 ft (13.4 m) to 38.0 ft (11.6 m) due to cost concerns. The Bobby Hopper Tunnel on I-49 in Arkansas was built with a 25 ft (7.6 m) height total clearance, leaving plenty of room for lighting and signs hanging from the ceiling and still exceeding the 16 ft (4.9 m) minimum for rural highways.
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