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Minimum lane width: The minimum lane width is 12 feet (3.7 m), identical to most US and state highways. Shoulder width: The minimum width of the left paved shoulder is 4 feet (1.2 m), and of the right paved shoulder 10 feet (3.0 m). With three or more lanes in each direction, both shoulders are to be at least 10 feet (3.0 m) wide.
The selection of lane width affects the safety, maximum capacity, and cost, of a highway. Safety is best at a width of 3.0 to 3.1 metres (9.8 to 10.2 ft) in urban settings, where both narrow (less than 2.8 metres (9 ft 2 in)) and wide (over 3.1 metres (10 ft)) lanes have higher crash risks.
A modern Autobahn divided highway with two lanes per direction has lanes 3.75 m (12.3 ft) wide with an additional clearance of 0.50 m (20 in) on each side; with three lanes per direction this becomes 3.75 m (12.3 ft) for the rightmost lane and 3.5 m (11 ft) for the other lanes. Urban access roads and roads in low-density areas may have lanes as ...
The outer lanes may also be known as a collector/distributor road where slip ramps provide access to and from the inner mainline lanes. This distinction is usually made when the outer lanes are only present by an interchange and not the full length of the highway. For even more capacity, frontage roads may feed into and from freeway local lanes ...
A controlled access highway may be two lanes known as a two-lane expressway. They are often undivided, are sometimes built when traffic volumes are low (but may be upgraded later), right-of-way is limited or due to low funding. They may be designed for easy conversion to one side of a four-lane freeway and right of way may already be acquired.
In UK, the "standard minimum clearance" for structures over public highways is 16 feet 6 inches (5.03 m). [3] In United States, the "minimum vertical clearance" of overpasses on Interstate Highway System is 16 feet (4.9 m).
The Sacramento region is getting closer to its first major freeway toll lane. Caltrans, the state of California’s highway authority, is seeking public input on a proposed $465 million express ...
A carriageway (British English) [1] or roadway (North American English) [2] consists of a width of road on which a vehicle is not restricted by any physical barriers or separation to move laterally. A carriageway generally consists of a number of traffic lanes together with any associated shoulder , but may be a sole lane in width (for example ...