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In the United States, the Interstate Highway standards for the Interstate Highway System use a 12 ft (3.7 m) standard lane width, while narrower lanes are used on lower classification roads. In Europe, laws and road widths vary by country; the minimum widths of lanes are generally between 2.5 to 3.25 m (8.2 to 10.7 ft). [ 13 ]
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.
[22] [23] [24] Florida's ESU plan prohibits trucks, busses, and trailers from driving on the shoulder and limits the speed limit to 50 mph on the shoulder, which is typically only 10 feet (3.0 m) wide compared to the standard 12 feet (3.7 m) width of highway travel lanes and contains rumble strips. [22]
United States Numbered Highways ranged from two-lane country roads to multi-lane freeways. After Dwight D. Eisenhower became president in 1953, his administration developed a proposal for an interstate highway system, eventually resulting in the enactment of the Federal-Aid Highway Act of 1956.
In a lane diet, the width of a car lane is decreased to reduce vehicle speeds and accidents [3] and provide space for other use. [4] Typically vehicular travel lane widths are narrowed to no more than 2.8 metres (9.1 ft), [5] and left turn (in countries where cars travel on the right-hand side of the road) storage lanes between 2.7 and 3.0 metres (9 and 10 ft). [6]
In Romania the total width of an expressway is 21.5 m, while the width of a highway is 26 m. As a result, each lane of an expressway are 0.25 meters narrower and there are no emergency lanes. The maximum speed is 10 km/h lower than that of a highway, 120km/h instead of 130km/h.
Generally, the minimum-width standard for a WOL in the US is 14 feet (4.3 m). [1] A wide outside through lane (WOTL) is a WOL that is intended for use by through traffic. Conversely, a narrow lane is a lane that is too narrow to be safely shared side by side by a bicycle and a motor vehicle.