Traffic calming is a set of strategies used by urban planners and traffic engineers which aim to slow down or reduce traffic, thereby improving safety for pedestrians and bicyclists as well as improving the environment for residents. Most countries post signage known as traffic signs or road signs, at the side of Roads to On divided roads including Expressways Motorways or Autobahns the central reservation (British English, median (North American For the Tasmanian island see Refuge Island (Tasmania A refuge island, also known as a pedestrian refuge or pedestrian island Crosswalk button neJPG|right|thumb|The button one pushes to activate the crosswalk signal A curb extension (or also kerb extension, bulb-out, kerb build-out, nib, elephant ear, curb bulge and blister Crosswalk button neJPG|right|thumb|The button one pushes to activate the crosswalk signal A chicane is a sequence of tight serpentine curves (usually an S-shape curve or a bus stop in a roadway used in Motor racing and The turning radius or turning circle of a Vehicle is the Radius of the smallest circular turn (ie Speed cushions are Traffic calming devices designed as several small Speed humps installed across the width of the road with spaces between them A curb extension (or also kerb extension, bulb-out, kerb build-out, nib, elephant ear, curb bulge and blister An urban planner is a professional who works in the field of Urban planning for the purpose of maximizing the effectiveness of a community's land use and infrastructure Traffic engineering is a branch of Civil engineering that uses engineering techniques to achieve the safe and efficient movement of people and goods Traffic on Roads may consist of Pedestrians ridden or herded Animals Vehicles Streetcars and other Conveyances either singly A pedestrian is a person travelling on foot whether Walking or Running. " Bicycle-friendly " describes policies and practices which may help some people feel more comfortable about traveling by Bicycle with other traffic Calming measures are common in Europe, especially Northern Europe; less so in North America.
Traffic calming was traditionally justified on the grounds of pedestrian safety and reduction of noise and local air pollution which are side effects of the traffic. Noise pollution (or environmental noise) is displeasing human- or machine-created sound that disrupts the activity or balance of human or animal life Air pollution is the human introduction into the atmosphere of Chemicals Particulate matter, or Biological materials that cause harm or discomfort However, streets have many social and recreational functions which are severely impaired by car traffic. The Livable Streets study by Donald Appleyard (circa 1977) found that residents of streets with light traffic had, on average, three more friends and twice as many acquaintances as the people on streets with heavy traffic which were otherwise similar in dimensions, income, etc. Livable Streets is a book by Donald Appleyard in which he showed that Streets have many social and recreational functions which are severely impaired by Donald Appleyard (1928&ndash1982 was a Professor of Urban Design at the University of California Berkeley. For much of the twentieth century, streets were designed by engineers who were charged only with ensuring traffic flow and not with fostering the other functions of streets. The twentieth century of the Common Era began on The basis for traffic calming is broadening traffic engineering to include designing for these functions.
There are 3 "E"'s that traffic engineers refer to when discussing traffic calming: engineering, (community) education, and (police) enforcement. Engineering is the Discipline and Profession of applying technical and scientific Knowledge and Education encompasses both the Teaching and Learning of Knowledge, proper conduct, and technical competency Coming into force (also called enforcement or enactment) is a term that refers to the process by which Legislation, or part of legislation and Because neighborhood traffic management studies have shown that often it is the residents themselves who are contributing to the perceived speeding problem within the neighborhood, it is stressed that the most effective traffic calming plans will entail all three components, and that engineering measures alone will not produce satisfactory results.
A number of visual changes to roads are being made to many streets to bring about more attentive driving, reduced speeds, reduced crashes, and greater tendency to yield to pedestrians. Visual traffic calming includes lane narrowings (9-10'), road diets (reduction in lanes), use of trees next to streets, on-street parking, and buildings placed in urban fashion close to streets.
Some additional traffic calming techniques that are often used are speed humps, speed cushions, and speed tables. These devices vary in size based on the desired speed. Humps, cushions and tables slow cars to between 10 and 25 miles per hour. Most devices are made of asphalt or concrete but rubber traffic calming products are emerging as an effective alternative with several advantages.
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Types of traffic-calming engineering measures
Traffic calming can include the following engineering measures:
- Narrower traffic lanes — streets can be narrowed by extending the sidewalk, adding bollards or planters, or adding a bike lane or parking. Narrowing traffic lanes differs from other road treatments by making slower speeds seem more natural to drivers and less of an artificial imposition, as opposed to most other treatments used that physically force lower speeds or restrict route choice.
- Speed bumps, sometimes split or offset in the middle to help emergency vehicles reduce delay
- Speed humps, parabolic devices that are less aggressive than speed bumps and used on residential streets
- Speed tables, long flat-topped speed humps that slow cars more gradually than humps
- Speed cushions, a series of three small speed humps that slow cars down but allow emergency vehicles to straddle them so as not to slow response time
- Chicanes, which create a horizontal deflection causing vehicles to slow as they would for a curve
- Raised pedestrian crossings and raised intersection
- Curb extensions (also called bulbouts) which narrow the width of the roadway at pedestrian crossings
- Pedestrian refuges or small islands in the middle of the street
- Median diverters to prevent left turns or through movements into a residential area
- Changing the surface material or texture (for example, the selective use of brick or cobblestone)
- Additional give way (yield) signs
- Converting one-way streets into two-way streets
- Chokers, which are curb extensions that narrow the roadway to a single lane at points
- Allowing parking on one or both sides of a street
- Converting an intersection into a cul-de-sac or dead end
- Boom barrier, restricting through traffic to authorised vehicles only. A speed bump (in British English a speed hump, road hump or sleeping policeman) is a velocity-reducing feature of road design to A speed hump (also called a road hump or undulation and in Ireland called a speed ramp) is a rounded Traffic calming device used to reduce vehicle speed and A speed table is a Traffic calming device designed as a long Speed hump with a flat section in the middle Speed cushions are Traffic calming devices designed as several small Speed humps installed across the width of the road with spaces between them A chicane is a sequence of tight serpentine curves (usually an S-shape curve or a bus stop in a roadway used in Motor racing and Crosswalk button neJPG|right|thumb|The button one pushes to activate the crosswalk signal In the field of Road transport, an intersection is a road junction where two or more Roads either meet or cross at grade (they are A curb extension (or also kerb extension, bulb-out, kerb build-out, nib, elephant ear, curb bulge and blister Crosswalk button neJPG|right|thumb|The button one pushes to activate the crosswalk signal For the Tasmanian island see Refuge Island (Tasmania A refuge island, also known as a pedestrian refuge or pedestrian island A brick is a block of Ceramic material used in Masonry construction laid using mortar. Cobblestones are stones that were frequently used in the pavement of early Streets "Cobblestone" is derived from the very old English word "cob" "Dead End Street" redirects here For the song by The Kinks see Dead End Street (song. A boom barrier is a bar or pole pivoted in such a way as to allow the boom to block vehicular access through a controlled point
- Closing of streets to create pedestrian zones
- Reducing speed limits near institutions such as schools and hospitals
- Vehicle activated sign, signs which react with a message if they detect a vehicle exceeding a pre-determined speed. Car-free zones (also known as auto-free zones and pedestrian zones) are areas of a city or town in which automobile traffic is prohibited school zone refers to an area on a Street near a School or near a crosswalk leading to a school that has a likely presence of Pedestrians School zones generally Vehicle activated sign (VAS is a generic term for a type of road Traffic sign which displays a message conditional upon the presence or speed of a road vehicle.
- Watchman, traffic calming system
Recent trends in North America
Traffic calming has been successfully used for decades in cities across Europe. See also Traffic enforcement camera The Watchman Casualty Reduction Scheme is a traffic calming measure used in the United Kingdom. More recently, in response to growing numbers of traffic accidents and speeding problems, cities across North America have begun creating traffic calming programs to improve safety and liveability on residential streets. Many municipalities create asphalt or concrete measures, although preformed rubber products that are easier to install and consistently meet standardized requirements are becoming increasingly popular.
Living street
A living street (sometimes known as Home zones or by the Dutch word woonerf, as the concept originated in the Netherlands) is a street in which the needs of car drivers are secondary to the needs of users of the street as a whole; traffic calming principles are integrated into their design. Living Streets is the name of a UK campaign group formerly the Pedestrians' Association A living street is a Street in which Home Zone is a term used in the United Kingdom for a residential Street or group of streets that are designed using principles similar to those of Living streets Dutch ( is a West Germanic language spoken by around 24 million people 22 million of which are from the Netherlands, Belgium and Suriname The Netherlands ( Dutch:, ˈnedərlɑnt is the European part of the Kingdom of the Netherlands, which consists of the Netherlands the Netherlands
See also
- Hierarchy of roads
- New Mobility Agenda
- Pedestrian
- Road traffic control
- Shared space
- Street hierarchy
- Sustainable transportation
External links
- Traffic calming in an Ontario, Canada community
- Traffic Calming Local Transport Note 01/07 - Department for Transport (United Kingdom)
- Online Transportation Demand Management Encyclopedia (Canada)
- TrafficCalming.org Guide to Traffic Calming (US)
- Perils for Pedestrians
- Perils For Pedestrians on Google Video
- Walkable Communities
- Traffic Logix Description of Traffic Calming, History, Benefits, and Related Links
- Links to Traffic Calming Programs in Cities Across North America
References
Dictionary
traffic calming
-noun
- the deliberate slowing of traffic in residential areas by the installation of obstacles to progress
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