bike - Segregated cycle facilities
Photograph by kellyhogaboomon Flickr.
In this context, segregated cycle facilities are a subset of shared facilities. Cycle-facility sceptics counter these improvements often simply restore the level of safety that existed before the marking or construction of the segregated cycle facility One of the potential pitfalls for observers trying to interpret the operation of segregated cycle facilities is that the same legal assumptions do not apply in all environments.
For the authorities the exclusion of cycle traffic from main routes was viewed as an important pre-requisite to the attainment of mass motorisation. See also cycle facilities at roundabouts. For urban roads with many junctions, accident analysis suggests that segregated cycling facilities are likely to produce a net increase in the number of collisions.
For instance, in Germany and elsewhere at junctions with segregated facilities all the traffic in a given direction (motorists, pedestrians and cyclists) may get a green signal at the same time. Other potential pitfalls in interpreting the operation of segregated cycle facilities are the issues of design vehicles and design users. While a Dutch sidepath system may work for Dutch cyclists, serious questions have been raised since at least the 1970s that other cyclists using faster bicycle types cannot use such a system safely at their higher normal cycling speeds. In some cases designers may focus on a particular design user.
The essence of the debate is whether segregated cycle facilities play a primary role of themselves, or are secondary to these other factors. Separate cycleways and bike trails are less controversial when used to promoting recreational cycling. A prominent example in the UK is the Bristol & Bath Railway Path, a 13 miles (21 km) off-road cycleway that is part of National Cycle Route 4.
As a general rule those cycleways with the highest perceived safety tend to be those engineered on the assumption of vehicular rather than pedestrian traffic. The route did not succeed, and the right of way later became the route for the Arroyo Seco Parkway, an automobile freeway opened in 1940. With the advent of the motor car, conflict arose between the increasingly powerful car lobby and bicycle users. In 1926 the CTC discussed an unsuccessful motion calling for cycle tracks to be built on each side of roads for the exclusive use of cyclists , and that cyclists could be taxed, providing the revenue was used for the provision of such tracks.
Bogota s Bike Paths Network or Ciclo-Ruta in Spanish, designed and built during the administration of Mayor Enrique Peñalosa attracts significant recreational use. In terms of multi-use trails, a shared trail may refer to a shared trail corridor with or without segregation within the corridor. Following the bicycle boom of the early 1980s, German towns began revisiting the concept.
In terms of car/bicycle collisions this is clearly mediated by how the cycleway network rejoins the main road network. sharks teeth or elephants footprints , and treatments using red, green or blue coloured tarmac.
The UK’s Sustrans guidelines for the National Cycle Network are based on recreational use with a design user who is an unaccompanied twelve-year-old. In some environments these represent established engineering practice while in others they may have to be retroactively applied in response to complaints and safety concerns.
However, given their historical purpose, a positive relationship between the use of segregated cycle facilities and increased cyclist numbers cannot be assumed. The safety in numbers argument has also been used to explain the apparent success of cycle facilities in some cities. Such a shared facility is often called a multi-user path or recreational path. The term cycle track / cycle path (UK) or sidepath (USA) refers to a footway- or sidewalk-type structure, for cyclists only, alongside (not on) a carriageway (UK) or roadway (USA). The category off-road facility includes all of the above: cycleways, bike trails, mountain-bike trails and bike paths. The term cycle lane (UK) or bike lane (USA) refers to a lane, for cyclists only, marked on an existing portion of a carriageway (UK), roadway or shoulder (USA). The category on-road facility includes cycle lanes and bike lanes. By the end of the 19th century, cycling was growing from a hobby to an established form of transport.
The Netherlands is a flat country and Dutch town planning keeps cycling distances short. Accordingly a mass programme of cycle track/cycle path construction was implemented. Post-war German governments chose to continue the transportation objectives of their Nazi predecessors, and cyclists were viewed as an impediment to motorised traffic to be excluded and restricted whenever feasible.
The CTC were listened to, and the use of cycle tracks largely fell out of favour in the UK. In Germany, the Nazi regime was committed to promoting the mass use of private motor cars and viewed the bicycle as an impediment to this goal. Cross for a study of car-bike collisions, expecting that this study would support their arguments on collision prevention.
These may use roads dedicated to exclusively cycle traffic or minor rural roads whose use is otherwise restricted to local motor traffic and agricultural machinery. The majority of collisions on urban roads occur at junctions and involve turning vehicles. Cycle paths can be particularly dangerous at intersections with roads.
In countries with different geographies and cycling cultures bicycles tend to have 7-15 gears (not counting duplicates), and a reasonably fit adult commuter can expect to reach speeds of 30 km/h (20 mph) Sports cyclists can travel even faster: with tailwinds or downhill gradients, some cyclists may exceed 50 km/h (30 mph). For instance, in contrast to most English speaking countries, some Northern European countries, including Germany, France, Denmark, Belgium and the Netherlands have defined liability legislation. This variation also applies to the operation of traffic signals and cyclist-specific traffic lights.
The Dublin Transportation Office has advertised their cycle facilities as being based on an unaccompanied ten-year-old design user. In Ireland, the provision of hard shoulders on interurban routes in the 1970s reportedly resulted in a 50% decrease in accidents. The safety of cycleways.
In Denmark as a whole, the establishment of a huge cycling infrastructure has been accompanied by cycling levels that have stayed roughly stable (with minor fluctuations) since 1975. This has led to various high-profile cycle network projects, in Bogotá, Montreal, Dublin, Portland, New York and many other cities. The issue of the safety of segregated cycling facilities is one of controversy.
Some question the prudence of funding new cycle facilities unless there is a simultaneous commitment to maintenance and sweeping. In areas subject to high leaf-fall in autumn, or high snowfall in winter, any cycle facilities must be subject to regular clearing if they are to remain usable. in Amsterdam place cyclists and motorists together on roads with speed limits at or below 30 km/h (19 mph), and segregate them through bicycle lanes at higher limits.
The USA equivalents include bike trails or mountain-bike trails, which are unsurfaced trails, and bike paths, which are surfaced trails which meet more rigorous standards for width, grade and accessibility. The consequences of other risks - falls, cyclist-cyclist collisions and cyclist-pedestrian collisions - are frequently not recorded in official accident figures and may be available only via local hospital surveys.
The construction of 320 kilometres (200 mi) of Strategic cycle network in Dublin has been accompanied by a 15% fall in commuter cycling and 40% falls in cycling by second and third level students. When they occur in such circumstances they are also associated with significantly increased risk of fatality.
A similar finding had been reported for Denmark in 1989, where it was found that there was no correlation between cycle facilities and increased cycling unless active traffic restraint measures were also present. Therefore it is arguable that if a segregated cycle facility attracts more people to cycle, this should contribute to an increase in safety.
Increasing traffic congestion and the 1970s oil shocks contributed to a resurgence in cycling in some countries. Thus the most popular examples tend to be converted road or railway alignments or constructed to the same standards used by road and railway engineers. There is evidence that one of the main factors influencing the individual safety of cyclists is the base number of cyclists using the roads - see safety in numbers effect.
In contrast, some research imply increases, some significant, in the rate and severity of car/bicycle collisions due to such segregation. Since the 1930s, the established cycling lobby in the UK and Ireland has taken a critical and measured view of the utility and value of segregating cyclists. In the 1970s the California Statewide Bicycle Committee arranged with Kenneth D. In the UK, little use of separate cycleway/cycle track systems took place except in the so-called new towns such as Stevenage and Harlow.
Under the influence of these guidelines cyclists and pedestrians were treated as a homogeneous group to be catered for using similar facilities. The rise of the Green movement in the 1990s has been accompanied by requests for the construction of cycle networks in many countries.
In the UK, facilities for non-motorized traffic are not normally salted or gritted in icy conditions, making them dangerous or completely unrideable; those who are willing to continue cycling in such conditions are safer on the main road if that has been appropriately treated. In some cases, cycle paths have been constructed so bicycles could be prohibited from the main roadway. Proponents tout segregation of cyclists as necessary to the provision of a safe cycling environment.
In the United States, In Helsinki, research has shown that cyclists are safer cycling on roads with traffic than when using the city s 800 kilometres (500 mi) of cycle paths. Direct rear impacts with cyclists are a more prominent collision type in arterial/rural road type situations. In addition, various road markings have been developed in an attempt to remedy the issue of increased junction collisions.
One UK study estimated that cycle path users are seven times more likely to get punctures than are road cyclists. Many cyclists will simply refuse to use poorly maintained facilities that offer obvious dangers. The roundtrip toll was 15¢ US and it was lit with electric lights along its entire length.
The typical Dutch town bike or granny bike has no gears or a three-speed hub gear and back pedal brakes. Research presented at a conference at Lund University in 1990 found that crash risk for cycle users crossing the intersection on a set-back path are up to 11.9 times higher than when cycling on the roadway in a bike lane (see diagrams). Particular concern attaches to the use of cycle lanes in urban situations such as large roundabouts.
This issue is captured in a 1996 review of the Sustrans approach from the Proceedings of the Institution of Civil Engineers. The fast cycle commuter must not be driven off the highway onto a route that is designed for a 12-year-old or a novice on a leisure trip, because if that happens, the whole attempt to enlarge the use of the bicycle will have failed Moving motor vehicles generate a sweeping effect that pushes road debris such as grit and broken glass to the edge of the roadway. For instance, a study of the accident impacts of re-engineering bicycle crossings in the Swedish city of Gothenburg attributes collision rate reductions in part to significant increases in cyclist volumes at the treated sites.
Cyclists campaigned to improve the existing, often poorly surfaced, roads and tracks. These conclusions are supported by the experience of countries that have implemented segregated cycling facilities.
Its right of way followed the stream bed of the Arroyo Seco and required 1,250,000 board feet (2,950 m3) of pine to construct. This raises the issue of what happens if different cyclist types find themselves forced onto such devices either by legal coercion or as a result of motorist aggression.
Examples of these include the use of special road markings, e.g. More recently, Shared Space redesigns of urban streets in those and other countries have achieved significant improvements in safety (as well as congestion and quality of life) by replacing segregated facilities with integrated space. The source of the direct safety problem lies in the nature of the predominant car/bicycle collision types.
It is controversial in the cycle path debate whether this is for the benefit of motorists or bicyclists. In 1996 the UK Cyclists Touring Club and the Institute of Highways and Transportation jointly produced a set of Cycle-Friendly Infrastructure guidelines that placed segregated cycling facilities at the bottom of the hierarchy of measures designed to promote cycling. In most cases, the most prominent examples of successful cycle networks were implemented in towns that already had significant numbers of cyclists.
This can result in greater cost and complexity in implementation particularly if there are already separate traffic signal phases for pedestrians, motorised traffic and public transport. Some treatments involve raising the cycle track onto a speed ramp type structure where it crosses side roads. When the path entrance is set back from the road, motorists often have difficulty seeing cyclists approaching from the path.
In addition, some off-road designs are not accessible to standard road sweeping equipment. Danish guidance specifies three different categories of cycle track.
Other UK examples include The Ebury Way Cycle Path, The Alban Way, the Hillend Loch Railway Path and the Nicky Line. When presented to the Committee in Sacramento on 19 June 1974, Cross s study showed the opposite: only 0.5% of car-bike collisions had occurred between straight-ahead cyclists and overtaking straight-ahead motorists.
Extensive interurban cycleway networks can be found in countries such as Denmark, which has had a national system of cycle routes since 1993. or roads and trails open exclusively to non-motorised modes, is difficult to assess.
A US group was the Good Roads Movement. An example of an early segregated cycle facility was the nine-mile dedicated Cycle-Way built in 1897 to connect Pasadena, California to Los Angeles. In contrast, in the late 1970s and early 1980s cycling underwent robust growth in Germany, the UK and Ireland while there was little or no investment in cycling infrastructure. A key concern raised by critics of such schemes is that the focus is often on constructing cycle facilities rather than facilitating cyclists .
This was in part the motivation behind the Hierarchy of Provision approach set out in Cycle Friendly Infrastructure. However, U.S.-based observers have stated that the provision of separate cycling facilities appears to be one of the keys to the achieving of high levels of cycling in the Netherlands, Denmark and Germany. The safety of cycling and the number of cyclists results from a complex interaction of spatial planning, population density, legislative environment, and wider traffic/transportation management policies see utility cycling for more detailed discussion. Examples include the addition of a separate system of traffic signals for bicycle traffic.
In Northern European countries, cycling tourism represents a significant proportion of overall tourist activity. See the Utility cycling article for other examples of measures to improve both actual and perceived safety. Various remedial measures have been developed in an attempt to solve the identified safety problems of segregated cycle facilities.
From the end of the 1960s in Nordic countries, the Swedish SCAFT guidelines on urban planning were highly influential and argued that non-motorised traffic must be segregated from motorised traffic wherever possible. The rate of fatality increases with speed limit of the road: The use of appropriately designed segregated space on arterial or interurban routes appears to be associated with reductions in overall risk.
By the late 1960s and 1970s, with the cyclists mainly gone, many German towns began removing cycle tracks so as to accommodate more car parking. The names and definitions of the various cycle facility types vary from country to country. The term cycleway (UK) refers to a road (UK) or path (USA), for cyclists only, on its own separate right of way.
The use of segregated cycle facilities is promoted by a large segment of the cycling community, for example lane and path cyclists, and also by many organisations associated with the environmental movement. Segregated cycle facilities are roads, tracks, paths or marked lanes designated for use by cyclists from which motorised traffic is generally excluded.
Sometimes, pedestrians and cyclists are expected to share the same road or path. In 2003 the longest continuous cycleway in Europe was opened, along the Albacete-Valdeganga highway in Spain, a distance of 22 kilometres (14 mi).
For adults, the standard vehicular cycling advice for handling roundabouts is to try to maintain a prominent position while circulating. By excluding motor traffic, cycle lanes and cycle tracks become parts of the road that are no longer routinely swept , thus collecting more broken glass and gravel.
Data collated by the OECD indicates that rural locations account for 35% or more of cycling fatalities in Denmark, Finland, France, Great Britain, Japan, the Netherlands and Spain. In the UK, cycling collision data recorded by police indicates that at non-junction locations, where a cyclist was struck directly from behind there was an overall fatality rate of 17%. The guidelines strongly influenced cities such as Helsinki and Västerås to build large cycle path networks.
The UK has recently implemented the National Cycle Network. Where available these routes often make use of abandoned railway corridors - see picture right of Mosel Maar cycle route. This is in a context where most of the measures prioritised by Cycle-Friendly Infrastructure (HGV restrictions, area-wide traffic calming, speed limit enforcement etc) are already in place - see Utility cycling for more detail. The typical cost of constructing a striped bike lane is US$10,000 - $50,000 per round-trip mile. Between the late 1980s and early 1990s the Netherlands spent 1.5 billion guilders (US$945 million) on cycling infrastructure, yet cycling levels stayed practically the same. In the UK, a ten-year study of the effect of cycle facilities in eight towns and cities found no evidence that they had resulted in any diversion from other transport modes.
