Climbing lane

Climbing lanes or crawler lanes are a roadway lane design. They allow slower travel for large vehicles, such as large trucks or semi-trailer trucks, ascending a steep grade. Since climbing uphill is difficult for these vehicles, they can travel in the climbing lane without slowing traffic.

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Climbing lane in Hungary; centre of image - right hand lane

Description

Climbing lanes are a roadway lane design, typically used on major routes such as motorways and interstate highways. In the UK, the climbing lane is also referred to as a crawler lane.[1] They allow slower travel for large vehicles, such as large trucks or semi-trailer trucks, ascending a steep grade. Since climbing uphill is difficult for these vehicles, they can travel in the climbing lane without slowing traffic.

Variants

A variation that has become common with newer roads and more recent widening schemes is to add an additional "fast" (passing) lane for the stretch which otherwise would have had a crawler lane. This allows underpowered vehicles to remain in the existing "slow" lane without having to purposely pull left into the "slow" lane (which some drivers may not do because of pride or ignorance - particularly tow-car drivers assuming it is a "truck only" lane), or having to try to merge back into faster traffic (possibly still at low speed) when it ends. Instead, the more normal requirement to purposely pull out to pass slower vehicles, and back in after doing so or when the lane ends, generally with a smaller speed differential (as they will be rejoining what is already a passing lane), is placed on faster drivers.

Safety

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Climbing lane in Jämsä, Finland.

On normally 2-lane roads without a divider, the climbing lane effectively creates a bi-directional central passing lane of the original uphill running lane. Its subsequent risk of head-on collisions, they are sometimes referred to as "suicide lanes". In some cases to reduce the risk, the road will be signed to prohibit overtaking when going downhill. Variations on this theme include altered road markings to highlight the climbing lane as being a temporary addition to the normal two (shorter dashed lines similar to those on merge/diverge lanes), or more clearly demarcating the two higher speed lanes (e.g. with markings that prevent uphill fast traffic using the downhill lane to pass slightly slower uphill vehicles themselves passing "crawlers", but still allowing downhill vehicles to overtake using the faster uphill lane if necessary, which has the effect of creating a false "center" line between the two regular lanes).

In the UK the additional climbing lane and the single downhill lane are generally separated by double white solid lines. It is an offence to position any part of your vehicle to the right of a double white line punishable by 3 penalty points, therefore this marking in itself prohibits any use of the climbing lane for overtaking by vehicles travelling downhill.

As trucks and recreational vehicles must use low gear to descend slowly, an additional lane may also be built on the downhill side. This prevents the vehicles from overusing their brakes, which may overheat and cause a runaway vehicle.

See also

References

  1. ^ "The Highway Code Online". Retrieved 2008-03-02.
Ballyhanedin

Ballyhanedin is a townland in the civil parish of Banagher in County Londonderry, Northern Ireland. It is located a 3km from the village of Feeny, and is situated within Causeway Coast and Glens district.

It lies on the A6 Belfast to Derry road. Although it is only a townland, Ballyhanedin has a boundary sign which shows where it begins.

Bleeding (roads)

Bleeding or flushing is shiny, black surface film of asphalt on the road surface caused by upward movement of asphalt in the pavement surface. Common causes of bleeding are too much asphalt in asphalt concrete, hot weather, low space air void content and quality of asphalt.Bleeding is a safety concern since it results in a very smooth surface, without the texture required to prevent hydroplaning.

Bowtie (road)

The bowtie is a type of road intersection which replaces left turns (in jurisdictions that drive on the right) or right turns (in jurisdictions that drive on the left), with roundabouts on the cross street. It is an alternative to the Michigan left intersection.

Colorado State Highway 94

State Highway 94 (SH 94) is an 85.5-mile-long (137.6 km) east–west Colorado state highway that goes east beginning from US 24 just east of Colorado Springs and ending at U.S. Highway 40/U.S. Highway 287 in rural Cheyenne County west of Wild Horse. The highway serves Schriever Air Force Base and the towns of Ellicott, Yoder, and Rush, where it then crosses through rural country. It also serves the Punkin Center area where it comes to a junction with SH 71. It then passes through more very rural country until it reaches a stop at US 40/287 west of the unincorporated town of Wild Horse.

Throughout most of its length, the highway runs due east–west, pointing exactly at Pikes Peak. Under good conditions, the peak can be seen as far east as the rise between mileposts 78 and 79.

"Garbage Hill" gets its name from the Colorado Springs landfill located north of the highway. Originally, the entrance to the landfill was partway up the hill, but currently the entrance is from Blaney Road at the top of the hill. At the bottom of the hill, which is the eastern side of Jimmy Camp Creek valley, there are wrecking yards and two motocross tracks. This hill is one of the most severe hills on Highway 94, having a climbing lane.

Glassphalt

Glassphalt (also spelled "glasphalt") is a variety of asphalt that uses crushed glass. It has been used as an alternative to conventional bituminous asphalt pavement since the early 1970s. Glassphalt must be properly mixed and placed if it is to meet roadway pavement standards, requiring some modifications to generally accepted asphalt procedures.

Generally, there is about 10%-20% glass by weight in glassphalt.

Lane

In the context of traffic control, a lane is part of a roadway (carriageway) that is designated to be used by a single line of vehicles, to control and guide drivers and reduce traffic conflicts. Most public roads (highways) have at least two lanes, one for traffic in each direction, separated by lane markings. On multilane roadways and busier two-lane roads, lanes are designated with road surface markings. Major highways often have two multi-lane roadways separated by a median.

Some roads and bridges that carry very low volumes of traffic are less than 4.6 metres (15 ft) wide, and are only a single lane wide. Vehicles travelling in opposite directions must slow or stop to pass each other. In rural areas, these are often called country lanes. In urban areas, alleys are often only one lane wide. Urban and suburban one lane roads are often designated for one-way traffic.

Link road

A link road is a transport infrastructure road that links two conurbations or other major road transport facilities, often added because of increasing road traffic. They can be controversial, especially if they threaten to destroy natural habitat and greenfield land.

The term is used in the United Kingdom, Australia, and the United States state of Nebraska.

An example of a link road is Marston Ferry Road in Oxford, England. It was built in the late 20th century link North Oxford with Marston, Oxford to the east.

List of road types by features

In this list, roads names are used in different areas and the features of the roads varies. So this table address the differences in that usage when needed.

N22 road (Ireland)

The N22 road is a national primary road in Ireland which goes through counties Kerry and Cork, from Tralee in the west through Killarney, Macroom and Ballincollig to Cork City in the east.

Sections of the N22 have been substantially upgraded in recent years. During the 1980s and 1990s a 25 km (16 mi) section between Killarney and the border with County Cork was rebuilt and widened. An auxiliary climbing lane has been provided on the steep grade sections. The late 1980s saw a 3 km (1.9 mi) bypass of Killarney. In 2004, the Ballincollig bypass west of Cork city was completed. This is an 11 km (6.8 mi) dual carriageway road built to Motorway standards that connects with the N40 Cork South Ring Road. In 2005, 4 km (2.5 mi) of the road between Tralee and Farranfore was upgraded. This added to a 4 km (2.5 mi) section opened in 2002. In August 2013, a new 5.5 km (3.4 mi) section of road was added as part of the Tralee N22/N69 bypass project at Ballingrelagh replacing the section of road where the N22 originally ended at the N21 John Cronin Roundabout in Ballycarty. The N22 now terminates at Camp Roundabout outside Tralee on the N22/N69 Tralee Bypass.

New York State Route 162

New York State Route 162 (NY 162) is a state highway in eastern New York in the United States. It runs from an intersection with U.S. Route 20 (US 20) in the Schoharie County town of Esperance to an interchange with NY 5S in the Montgomery County town of Root, west of the village of Canajoharie. The southernmost 0.75 miles (1.21 km) of the route are concurrent with NY 30A, which continues south of NY 162's intersection with US 20. NY 162 is a two-lane highway for all of its length, although its final 1.25 miles (2.01 km) has a climbing lane southbound as it leaves the Mohawk Valley over the Sprakers Gorge. The route was assigned as part of the 1930 renumbering of state highways in New York and realigned slightly in the late 1960s to bypass an accident-prone stretch near its northern terminus.

New York State Route 334

New York State Route 334 (NY 334) is a north–south state highway in the Mohawk Valley region of New York in the United States. It extends for 5.96 miles (9.59 km) from an intersection with NY 5 in the village of Fonda to a junction with NY 67 in the town of Johnstown. The highway is two lanes wide for its entire length, with the exception of a long climbing lane northbound leaving the hamlet of Sammonsville, located 1.5 miles (2.4 km) southwest of NY 67.

Offset T-intersection

An offset T-intersection is an at-grade road intersection where a conventional four leg intersection is split into two three-leg T-intersections to reduce the number of conflicts and improve traffic flow. Building the offset T-intersections as continuous green T-intersections (also called seagull intersection), there is a single stop on the arterial road, only. A higher volume of through traffic on the cross road, or on unsignalized intersections, a rebuild to a conventional four-leg intersection may be adequate, also when the offset is a few feet only like staggered junctions causing slower traffic for a longer time on the arterial road.Seen as a spur route or access road, offset T-intersections can be seen as an A2 or B2 type partial cloverleaf interchange with no arterial road.

Overpass

An overpass (called an overbridge or flyover in the United Kingdom and some other Commonwealth countries) is a bridge, road, railway or similar structure that crosses over another road or railway. An overpass and underpass together form a grade separation. Stack interchanges are made up of many overpasses.

Passing lane

A passing lane (North American English) or overtaking lane (English) is a lane on a multi-lane highway or motorway closest to the median of the road (the central reservation). In some countries, lanes are described as being on the 'inside' or the 'outside' of a road, and the location of the passing lanes will vary.

In modern traffic planning, passing lanes on freeways are usually designed for through/express traffic, while the lanes furthest from the median of the road have entry/exit ramps. However due to routing constraints, some freeways may have ramps exiting from the passing lane; these are known as "left exits" in North America.

A passing lane is commonly referred to as a "fast lane" because it is often used for extended periods of time for through traffic or fast traffic. In theory, a passing lane should be used only for passing, thus allowing, even on a road with only two lanes in each direction, motorists to travel at their own pace.

A 2+1 road has a passing lane only in one direction, usually alternating each few kilometers. In practice, they are more like upgraded highways than motorways.

Plank road

A plank road is a road composed of wooden planks or puncheon logs. Plank roads were commonly found in the Canadian province of Ontario as well as the Northeast and Midwest of the United States in the first half of the 19th century. They were often built by turnpike companies.

Primitive road

A primitive road is a minor road system, used for travel or transportation that is generally not maintained or paved.

Sepulveda Pass

Sepulveda Pass (elevation 1,130 feet (344 m)) is a low mountain pass through the Santa Monica Mountains in Los Angeles.

It connects the Los Angeles Basin to the San Fernando Valley via the San Diego Freeway (I-405) and Sepulveda Boulevard. The crossing experiences heavy traffic (over 330,000 cars a day) on a regular basis, commonly experiencing major traffic slowdowns lasting hours.I-405 was widened by Los Angeles Metro, the county's transportation authority. The project took three years to complete and concluded in December 2016. Additionally, funding has been secured to construct an expansion to Los Angeles's public transportation system through the Sepulveda Pass, but the plan has not been finalized.The Sepulveda Pass on Interstate 405 begins just south of Ventura Boulevard in the San Fernando Valley, climbing to just south of Mulholland Drive, then descending to just north of Sunset Boulevard, where I-405 and Sepulveda Boulevard enter the Brentwood and Westwood areas of West Los Angeles. Northbound I-405 has five lanes and a carpool lane (plus a seventh as the Ventura exit is approached), while southbound I-405 has four lanes plus a carpool lane (although on the ascending portion there is a climbing lane).

Sepulveda Boulevard has two lanes in each direction and runs west of I-405 until the middle of the pass, where it crosses under and runs east of the freeway.

Bel Air Presbyterian Church, founded in 1956, opened its church on Mulholland Drive in 1960. Beginning with The Westland School in 1965, a number of other educational and cultural institutions have located in the vicinity of Sepulveda Pass, creating an "institutional corridor" as an exception to the Mulholland Scenic Parkway Specific Plan's general prohibition of such development along the crest of the mountains. The institutions along Mulholland Drive now also include Stephen S. Wise Temple, American Jewish University, the Skirball Cultural Center, Milken Community High School, The Mirman School, Berkeley Hall School, and The Curtis School. To the south is the large campus of the Getty Center.

Side road

A side road is a minor highway typically leading off a main road. A side road may be so minor as to be uncategorized with a road number.

In an urban area, a side road may be a narrow street leading off a more major street, especially in a residential area.

Tarmacadam

Tarmacadam is a road surfacing material made by combining macadam surfaces, tar, and sand, patented by Welsh inventor Edgar Purnell Hooley in 1902. The terms "tarmacadam" and tarmac are also used for a variety of other materials, including tar-grouted macadam, bituminous surface treatments, and modern asphalt concrete. The term is also often used to describe airport aprons (also referred to as "ramps"), taxiways, and runways regardless of the surface.

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