Resultado de búsqueda
A shoulder, hard shoulder (British) or breakdown lane is an emergency stopping lane by the verge on the outer side of a road or motorway. Many wider freeways , or expressways elsewhere have shoulders on both sides of each directional carriageway—in the median, as well as at the outer edges of the road, for additional safety.
According to the American Association of State Highway and Transportation Officials (AASHTO) guidelines, the recommended paved shoulder width for rural highways ranges from 4 to 8 feet, depending on the design speed and traffic volume. For urban areas, the recommended width is typically 6 to 8 feet. Design Standards Table.
Shoulders are an important element of the highway system, providing space for emergency stops, a recovery zone for errant vehicles, struc-tural support for the pavement, drainage, improved sight distance, passage for bicyclists, and increased roadway width to accommodate agricultural vehicles. Granular shoulders are a commonly used shoulder option.
Shoulder usage studies indicate that shoulders can be designed less strong than pavements with respect to axle-load repetitions, but they must be capable of supporting the same axle weights as the pavement without structural damage.
Features intended to facilitate rapid runoff of surface water (of primary importance for good shoulder maintenance) are the shoulder finished 1 in. below the pavement edge, shoulder slope of 1 in. per ft, and deep side ditches with a minimum depth of 18 in. below the outside edge of the shoulder.
A stabilized shoulder 8 to 12 ft wide and continuous along an expressway is needed to prevent blocking of all lanes when a vehicle must stop on the roadway.
1 de ene. de 2018 · To provide rapid movement of vehicle the highway construction and its maintenance should be perfect. Shoulder is a very essential requirement of any roads. It gives a service for emergency space...
