Shared lane marking
Encyclopedia
A shared-lane marking or sharrow is a street marking installed at locations in Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

, Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

, and the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. This marking is placed in the center of a travel lane to indicate that a bicyclist may use the full lane. The name sharrow was coined by Oliver Gajda, of the City and County of San Francisco Bicycle Program, and is a portmanteau of share and arrow..

History

These markings are used in the USA, Australia and other countries. In US usage, the wide shape of the arrow, combined with the bike symbol, gave rise to unofficial names such as "bike in a house" or "sharrow". In the UK roughly the same function is served by a bicycle symbol without arrows. However this tends to be used more as an indication of a formal cycle route rather than as an encouragment to share the road.

The original 'bike in a house" or "man jumping barrels at home" marking was developed by James Mackay and included in the 1993 Denver Bicycle Master Plan. While Mackay had considered a 'connect the dots" pavement markings approach for bicycle route definition and lane positioning reinforcement for bicyclists earlier when he was the Bicycle Facilities Engineer for the North Carolina Department of Transportation, the City of Denver's unwillingness to commit to bike lane markings meant that shared lane markings were the only pavement marking treatment for bicyclists that the City would implement. The hollow arrow surrounding the bicyclist was intended to reinforce the correct direction of travel for bicyclists (who were frequently observed riding the wrong-way, against traffic, in Denver).

In 2004, the city of San Francisco, California
San Francisco, California
San Francisco , officially the City and County of San Francisco, is the financial, cultural, and transportation center of the San Francisco Bay Area, a region of 7.15 million people which includes San Jose and Oakland...

 began experimenting with the shared lane marking, and developed a revised symbol consisting of a bicycle symbol with two chevron markings above the bicycle.

The stated purposes of the shared-lane markings used in California were to:
  • Assist bicyclists with lateral positioning in a shared lane with on-street parallel parking in order to reduce the chance of a bicyclist’s impacting the open door of a parked vehicle
    Door zone
    The door zone is the space spanning about four feet from the sides of parallel parked cars. It is hazardous to ride a bicycle or motorcycle in a door zone because if a door is suddenly opened, the cyclist must either crash into it , brake suddenly, or swerve into the adjacent lane of traffic...

    ;
  • Assist bicyclists with lateral positioning in lanes that are too narrow for a motor vehicle and a bicycle to travel side by side within the same traffic lane;
  • Alert motorists of the lateral location bicyclists are likely to occupy within the traveled way;
  • Encourage safe passing of bicyclists by motorists; and
  • Reduce the incidence of wrong-way bicycling.

USA

Based on the San Francisco experimental data, in August 2004 the California Traffic Control Devices Committee (CTCDC) approved the use of this marking in the State of California.

In the 2009 edition of the Manual on Uniform Traffic Control Devices
Manual on Uniform Traffic Control Devices
The Manual on Uniform Traffic Control Devices is a document issued by the Federal Highway Administration of the United States Department of Transportation to specify the standards by which traffic signs, road surface markings, and signals are designed, installed, and used...

, shared lane markings were approved for general use. They have been used in a number of cites, including:
  • Flagstaff, Arizona
    Flagstaff, Arizona
    Flagstaff is a city located in northern Arizona, in the southwestern United States. In 2010, the city's population was 65,870. The population of the Metropolitan Statistical Area was at 134,421 in 2010. It is the county seat of Coconino County...

  • Long Beach, California
    Long Beach, California
    Long Beach is a city situated in Los Angeles County in Southern California, on the Pacific coast of the United States. The city is the 36th-largest city in the nation and the seventh-largest in California. As of 2010, its population was 462,257...

  • Los Angeles, California
    Los Angeles, California
    Los Angeles , with a population at the 2010 United States Census of 3,792,621, is the most populous city in California, USA and the second most populous in the United States, after New York City. It has an area of , and is located in Southern California...

  • Santa Monica, California
    Santa Monica, California
    Santa Monica is a beachfront city in western Los Angeles County, California, US. Situated on Santa Monica Bay, it is surrounded on three sides by the city of Los Angeles — Pacific Palisades on the northwest, Brentwood on the north, West Los Angeles on the northeast, Mar Vista on the east, and...

  • Fort Collins, Colorado
    Fort Collins, Colorado
    Fort Collins is a Home Rule Municipality situated on the Cache La Poudre River along the Colorado Front Range, and is the county seat and most populous city of Larimer County, Colorado, United States. Fort Collins is located north of the Colorado State Capitol in Denver. With a 2010 census...

  • Miami, Florida
    Miami, Florida
    Miami is a city located on the Atlantic coast in southeastern Florida and the county seat of Miami-Dade County, the most populous county in Florida and the eighth-most populous county in the United States with a population of 2,500,625...

  • Miami Beach, Florida
    Miami Beach, Florida
    Miami Beach is a coastal resort city in Miami-Dade County, Florida, United States, incorporated on March 26, 1915. The municipality is located on a barrier island between the Atlantic Ocean and Biscayne Bay, the latter which separates the Beach from Miami city proper...

  • Atlanta, Georgia
    Atlanta, Georgia
    Atlanta is the capital and most populous city in the U.S. state of Georgia. According to the 2010 census, Atlanta's population is 420,003. Atlanta is the cultural and economic center of the Atlanta metropolitan area, which is home to 5,268,860 people and is the ninth largest metropolitan area in...

  • Chicago, Illinois
    Bicycling in Chicago
    Since the advent of the bicycle in the 1860s, Chicago has been distinguished as one of the premier cycling locations in the United States, with such public cycling destinations as Grant Park, Burnham Park and the Chicago Park District's Lakefront Trail...

  • Fort Wayne, Indiana
    Fort Wayne, Indiana
    Fort Wayne is a city in the US state of Indiana and the county seat of Allen County. The population was 253,691 at the 2010 Census making it the 74th largest city in the United States and the second largest in Indiana...

  • Louisville, Kentucky
    Louisville, Kentucky
    Louisville is the largest city in the U.S. state of Kentucky, and the county seat of Jefferson County. Since 2003, the city's borders have been coterminous with those of the county because of a city-county merger. The city's population at the 2010 census was 741,096...

  • Ann Arbor, Michigan
    Ann Arbor, Michigan
    Ann Arbor is a city in the U.S. state of Michigan and the county seat of Washtenaw County. The 2010 census places the population at 113,934, making it the sixth largest city in Michigan. The Ann Arbor Metropolitan Statistical Area had a population of 344,791 as of 2010...

  • Minneapolis Minnesota
  • St. Louis, Missouri
    St. Louis, Missouri
    St. Louis is an independent city on the eastern border of Missouri, United States. With a population of 319,294, it was the 58th-largest U.S. city at the 2010 U.S. Census. The Greater St...

  • Albany, New York
    Albany, New York
    Albany is the capital city of the U.S. state of New York, the seat of Albany County, and the central city of New York's Capital District. Roughly north of New York City, Albany sits on the west bank of the Hudson River, about south of its confluence with the Mohawk River...

  • Ithaca, New York
    Ithaca, New York
    The city of Ithaca, is a city in upstate New York and the county seat of Tompkins County, as well as the largest community in the Ithaca-Tompkins County metropolitan area...

  • Cary, North Carolina
    Cary, North Carolina
    Cary is a large town and suburb of Raleigh, North Carolina in Wake and Chatham counties in the U.S. state of North Carolina. Located almost entirely in Wake County, it is the second largest municipality in that county and the third largest municipality in The Triangle after Raleigh and Durham...

  • Raleigh, North Carolina
    Raleigh, North Carolina
    Raleigh is the capital and the second largest city in the state of North Carolina as well as the seat of Wake County. Raleigh is known as the "City of Oaks" for its many oak trees. According to the U.S. Census Bureau, the city's 2010 population was 403,892, over an area of , making Raleigh...

  • Columbus, Ohio
    Columbus, Ohio
    Columbus is the capital of and the largest city in the U.S. state of Ohio. The broader metropolitan area encompasses several counties and is the third largest in Ohio behind those of Cleveland and Cincinnati. Columbus is the third largest city in the American Midwest, and the fifteenth largest city...

  • Dayton, Ohio
    Dayton, Ohio
    Dayton is the 6th largest city in the U.S. state of Ohio and the county seat of Montgomery County, the fifth most populous county in the state. The population was 141,527 at the 2010 census. The Dayton Metropolitan Statistical Area had a population of 841,502 in the 2010 census...

  • Portland, Oregon
    Portland, Oregon
    Portland is a city located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States...

  • Bethlehem, Pennsylvania
    Bethlehem, Pennsylvania
    Bethlehem is a city in Lehigh and Northampton Counties in the Lehigh Valley region of eastern Pennsylvania, in the United States. As of the 2010 census, the city had a total population of 74,982, making it the seventh largest city in Pennsylvania, after Philadelphia, Pittsburgh, Allentown, Erie,...

  • Pittsburgh, Pennsylvania
    Pittsburgh, Pennsylvania
    Pittsburgh is the second-largest city in the US Commonwealth of Pennsylvania and the county seat of Allegheny County. Regionally, it anchors the largest urban area of Appalachia and the Ohio River Valley, and nationally, it is the 22nd-largest urban area in the United States...

  • Spartanburg, South Carolina
    Spartanburg, South Carolina
    thgSpartanburg is the largest city in and the county seat of Spartanburg County, South Carolina, United States. It is the second-largest city of the three primary cities in the Upstate region of South Carolina, and is located northwest of Columbia, west of Charlotte, and about northeast of...

  • Austin, Texas
    Austin, Texas
    Austin is the capital city of the U.S. state of :Texas and the seat of Travis County. Located in Central Texas on the eastern edge of the American Southwest, it is the fourth-largest city in Texas and the 14th most populous city in the United States. It was the third-fastest-growing large city in...

  • Salt Lake City, Utah
    Salt Lake City, Utah
    Salt Lake City is the capital and the most populous city of the U.S. state of Utah. The name of the city is often shortened to Salt Lake or SLC. With a population of 186,440 as of the 2010 Census, the city lies in the Salt Lake City metropolitan area, which has a total population of 1,124,197...

  • Bellevue, Washington
    Bellevue, Washington
    Bellevue is a city in the Eastside region of King County, Washington, United States, across Lake Washington from Seattle. Long known as a suburb or satellite city of Seattle, it is now categorized as an edge city or a boomburb. The population was 122,363 at the 2010 census.Downtown Bellevue is...

  • Sheboygan, Wisconsin
    Sheboygan, Wisconsin
    -Airport:Sheboygan is served by the Sheboygan County Memorial Airport, which is located several miles from the city.-Roads:Interstate 43 is the primary north-south transportation route into Sheboygan, and forms the west boundary of the city. U.S...



Other US jurisdictions have also installed this marking, but are not participating in US federally approved or sanctioned experiments. There is a concern that the shared lane markings installed in some of these locations are not consistent with recent recommendations on marking design and positioning.

In January 2007, the US National Committee on Uniform Traffic Control Devices (NCUTCD) endorsed the shared lane marking concept, and recommended its inclusion in the US Federal Manual on Uniform Traffic Control Devices
Manual on Uniform Traffic Control Devices
The Manual on Uniform Traffic Control Devices is a document issued by the Federal Highway Administration of the United States Department of Transportation to specify the standards by which traffic signs, road surface markings, and signals are designed, installed, and used...

 (MUTCD). The shared lane marking is now included in the current version of the Manual on Uniform Traffic Control Devices
Manual on Uniform Traffic Control Devices
The Manual on Uniform Traffic Control Devices is a document issued by the Federal Highway Administration of the United States Department of Transportation to specify the standards by which traffic signs, road surface markings, and signals are designed, installed, and used...

 (MUTCD), which was adopted by the Federal Highway Administration
Federal Highway Administration
The Federal Highway Administration is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two "programs," the Federal-aid Highway Program and the Federal Lands Highway Program...

 on December 16, 2009.

The city of Seattle, Washington
Seattle, Washington
Seattle is the county seat of King County, Washington. With 608,660 residents as of the 2010 Census, Seattle is the largest city in the Northwestern United States. The Seattle metropolitan area of about 3.4 million inhabitants is the 15th largest metropolitan area in the country...

 included extensive use of shared lane markings in its Bicycle Master Plan of early 2007.

Canada

  • Victoria, BC — In July 2009, "activist" cyclists calling themselves the Other Urban Repair Squad twice painted markings on congested Hillside Avenue but the City of Victoria immediately dispatched crews to cover the markings with gray paint.
  • Toronto
    Toronto
    Toronto is the provincial capital of Ontario and the largest city in Canada. It is located in Southern Ontario on the northwestern shore of Lake Ontario. A relatively modern city, Toronto's history dates back to the late-18th century, when its land was first purchased by the British monarchy from...

     (Ontario) also features "sharrows" on several streets.
  • St. Catharines (Ontario) has upgraded several major streets (Scott Street, Geneva Street) and the downtown core with sharrows as of 2009.
  • Edmonton
    Edmonton
    Edmonton is the capital of the Canadian province of Alberta and is the province's second-largest city. Edmonton is located on the North Saskatchewan River and is the centre of the Edmonton Capital Region, which is surrounded by the central region of the province.The city and its census...

     has begun to install shared-lane markings on several streets in 2009.
  • Saskatoon
    Saskatoon
    Saskatoon is a city in central Saskatchewan, Canada, on the South Saskatchewan River. Residents of the city of Saskatoon are called Saskatonians. The city is surrounded by the Rural Municipality of Corman Park No. 344....

     installed shared-lane markings on most of its downtown streets in 2009.
  • Winnipeg
    Winnipeg
    Winnipeg is the capital and largest city of Manitoba, Canada, and is the primary municipality of the Winnipeg Capital Region, with more than half of Manitoba's population. It is located near the longitudinal centre of North America, at the confluence of the Red and Assiniboine Rivers .The name...

     has begun to use shared-lane markings since 2008.
  • Montreal
    Montreal
    Montreal is a city in Canada. It is the largest city in the province of Quebec, the second-largest city in Canada and the seventh largest in North America...

     has had shared-lane markings on paths into and out of the downtown core, since 2006. Many indicate a path of travel inconsistent with the intent of the shared-lane marking.
  • Moncton has begun using shared-lane markings in 2010.
  • Vancouver
    Vancouver
    Vancouver is a coastal seaport city on the mainland of British Columbia, Canada. It is the hub of Greater Vancouver, which, with over 2.3 million residents, is the third most populous metropolitan area in the country,...

    has sharrows on some streets, in addition to separated bike lanes.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK