There are various measures cities and regions often take on the roadway to make it more cycling friendly and safer. Aspects of infrastructure may be viewed as either cyclist-hostile or as
cyclist-friendly. However, scientific research indicates that different groups of cyclists show varying preferences of which aspects of cycling infrastructure are most relevant when choosing a specific cycling route over another. Measures to encourage cycling include traffic calming; traffic reduction; junction treatment; traffic control systems to recognize cyclists and give them priority; exempt cyclists from banned turns and access restrictions; implement contra-flow cycle lanes on one-way streets; implement on-street parking restrictions; provide
advanced stop lines/bypasses for cyclists at traffic signals; marking wide curb/kerb lanes; and marking shared bus/cycle lanes. Colombian city, Bogota converted some car lanes into bidirectional bike lanes during coronavirus pandemic, adding 84 km of new
bike lanes; the government is intending to make these new bike lanes permanent. In the US, slow-street movements have been introduced by erecting makeshift barriers to slow traffic and allow bikers and walkers to safely share the road with
motorists.
Traffic reduction Removing traffic can be achieved by straightforward diversion or alternatively reduction. Diversion involves routing through-traffic away from roads used by high numbers of cyclists and pedestrians. Examples of diversion include the construction of
arterial bypasses and ring roads around urban centers. "street cut" in
Chinatown, Ottawa, allows bicycle and pedestrian through-traffic while preventing motorized vehicles from using the residential street as a shortcut. Indirect methods involve reducing the infrastructural capacity dedicated to moving motorized vehicles. This can involve reducing the number of road lanes, closing bridges to certain vehicle types and creating
vehicle restricted zones or environmental traffic cells. In the 1970s the Dutch city of
Delft began restricting private car traffic from crossing the city center. Similarly,
Groningen is divided into four zones that cannot be crossed by private motor-traffic, (private cars must use the ring road instead). Cyclists and other traffic can pass between the zones and cycling accounts for 50%+ of trips in Groningen (which reputedly has the third-highest proportion of cycle traffic of any city). The Swedish city of
Gothenburg uses a similar system of traffic cells. Another approach is to reduce the capacity to park cars. Starting in the 1970s, the city of
Copenhagen, where now 36% of the trips are done by bicycle, adopted a policy of reducing available car parking capacity by several per cents per year. The city of
Amsterdam, where around 40% of all trips are by bicycle, adopted similar parking reduction policies in the 80s and 90s. Direct traffic reduction methods can involve straightforward bans or more subtle methods like
road pricing schemes or
road diets. The
London congestion charge reportedly resulted in a significant increase in cycle use within the affected area.
Traffic calming Speed reduction has traditionally been attempted by statutory
speed limits and enforcing the
assured clear distance ahead rule. Recent implementations of
shared space schemes have delivered significant traffic speed reductions. The reductions are sustainable, without the need for speed limits or
speed limit enforcement. In
Norrköping, Sweden, mean traffic speeds in 2006 dropped from 21 to 16 km/h (13 to 10 mph) since the implementation of such a scheme. Even without shared street implementation, creating
30 km/h zones (or
20 mph zone) has been shown to reduce crash rates and increase numbers of cyclists and pedestrians. Other studies have revealed that lower speeds reduce community severance caused by high speed roads. Research has shown that there is more neighborhood interaction and community cohesion when speeds are reduced to 20 mph.
One-way streets German research indicates that making
one-way streets two-way for cyclists results in a reduction in the total number of collisions. In
Belgium, all one-way streets in 50 km/h zones are by default two-way for cyclists. A
Danish road directorate states that in town centers it is important to be able to cycle in both directions in all streets, and that in certain circumstances, two-way cycle traffic can be accommodated in an otherwise one-way street.
Two-way cycling on one-way streets s for cyclists with additional signs (Germany)
One-way street systems can be viewed as either a product of traffic management that focuses on trying to keep motorized vehicles moving regardless of the social and other impacts, such as by some cycling campaigners, or seen as a useful tool for traffic calming, and for eliminating
rat runs, in the view of UK traffic planners. One-way streets can disadvantage cyclists by increasing trip-length, delays and hazards associated with weaving maneuvers at junctions. German research indicates that making one-way streets two-way for cyclists results in a reduction in the total number of collisions. There are often restrictions to what one-way streets are good candidates for allowing two-way cycling traffic. In
Belgium road authorities in principle allow any one-way street in zones to be two-way for cyclists if the available lane is at least wide (area free from parking) and no specific local circumstances prevent it.
Denmark, a country with high cycling levels, does not use one-way systems to improve traffic flow. Some commentators argue that the initial goal should be to dismantle large one-way street systems as a traffic calming/traffic reduction measure, followed by the provision of two-way cyclist access on any one-way streets that remain.
Intersection and junction design In general,
junction designs that favor higher-speed turning, weaving and merging movements by motorists tend to be hostile for cyclists. Free-flowing arrangements can be hazardous for cyclists and should be avoided. Cycling advocates argue for modifications and alternative junction types that resolve these issues such as reducing kerb radii on street corners, eliminating slip roads and replacing large roundabouts with
signalized intersections.
Protected intersection Another approach which the
Netherlands innovated is called in North America a protected intersection that reconfigures intersections to reduce risk to cyclists as they cross or turn. Some American cities are starting to pilot protected intersections.
Bike box A bike box or an
advanced stop line is a designated area at the head of a traffic lane at a signalized intersection that provides bicyclists with a safer and more visible way to get ahead of queuing traffic during the red signal phase.
Roundabouts On large roundabouts of the design typically used in the UK and Ireland, cyclists have an injury accident rate that is 14–16 times that of motorists. In the UK, a survey of over 8,000 highly experienced and mainly adult male
Cyclists Touring Club members found that 28% avoided roundabouts on their regular journey if at all possible. The Dutch CROW guidelines recommend roundabouts only for intersections with motorized traffic up to 1500 per hour. To accommodate greater volumes of traffic, they recommend traffic light intersections or grade separation for cyclists. Examples of grade separation for cyclists include tunnels, or more spectacularly, raised "floating" roundabouts for cyclists.
Traffic signals/Traffic control systems How
traffic signals are designed and implemented directly impacts cyclists. For instance, poorly adjusted vehicle detector systems, used to trigger signal changes, may not correctly detect cyclists. This can leave cyclists in the position of having to "run" red lights if no motorized vehicle arrives to trigger a signal change. Some cities use urban adaptive traffic control systems (UTCs), which use linked traffic signals to manage traffic in response to changes in demand. However, there are more direct negative impacts. For instance, where signals are arranged to provide motor traffic with so-called
green waves, this can create "red waves" for other road users such as cyclists and public transport services. However, this would still not resolve the problem of red-waves for slow (old and young) and fast (above average fitness) cyclists. Cycling-specific measures that can be applied at traffic signals include the use of
advanced stop lines and/or bypasses. In some cases cyclists might be given a free-turn or a signal bypass if turning into a road on the nearside.
mountain pass cycling milestones have become an important service for bicycle tourists. They provide cyclists with information about their current position with regard to the summit of the
mountain pass.
Numbered-node cycle networks are increasingly used in Europe to give flexible, low-cost signage.
Widening outside lanes One method for reducing potential friction between cyclists and motorized vehicles is to provide "wide kerb", or "nearside", lanes (UK terminology) or "
wide outside through lane" (U.S. terminology). These extra-wide lanes increase the probability that motorists pass cyclists at a safe distance without having to change lanes. This is held to be particularly important on routes with a high proportion of wide vehicles such as
buses or
heavy goods vehicles (HGVs). They also provide more room for cyclists to filter past queues of cars in congested conditions and to safely overtake each other. Due to the tendency of all vehicle users to stay in the center of their lane, it would be necessary to sub-divide the cycle lane with a broken white line to facilitate safe overtaking. Overtaking is indispensable for cyclists, as speeds are not dependent on the legal speed limit, but on the rider's capability. The use of such lanes is specifically endorsed by
Cycling: the way ahead for towns and cities, the
European Commission policy document on cycle promotion.
Shared space scheme reduced motor traffic by 93%.
Shared space schemes extend this principle further by removing the reliance on lane markings altogether, and also removing road signs and signals, allowing all road users to use any part of the road, and giving all road users equal priority and equal responsibility for each other's safety. Experiences where these schemes are in use show that road users, particularly motorists, undirected by signs, kerbs, or road markings, reduce their speed and establish eye contact with other users. Results from the thousands of such implementations worldwide all show casualty reductions and most also show reduced journey times. After the partial conversion of London's
Kensington High Street to shared space, accidents decreased by 44% (the London average was 17%). in
Mannheim, Germany
CFI argues for a marked lane width of .
Road surface Bicycle tires being narrow, road surface is more important than for other transport, for both comfort and safety. The type and placement of storm drains, manholes,
surface markings, and the general road surface quality should all be taken into account by a bicycle transportation engineer.
Drain grates, for example, must not catch wheels. ==Trip-end facilities==