Quadrant roadway intersection
Encyclopedia
A quadrant roadway intersection adds an additional "quadrant roadway" between two legs of the intersection. This roadway adds two three-way intersections in addition to the original four-way intersection moving all left turns (in right-hand traffic countries) or right turns (in left-hand traffic countries) from the main intersection. The design is intended to improve traffic flow by reducing signal timing phases from four to two in the main intersection. The design is intended for intersections where large artery routes meet in an area of dense development and high pedestrian volume.
Proponents also point to a reduction in points where accidents could occur from vehicles potentially crossing paths as well as a low development cost over roundabout
or the more complex single-point urban interchange
designs. Opponents point to the increase in points where accidents could occur with merging traffic as well as the non-traditional nature of the design which has the potential to confuse drivers. Opponents also refute low cost claims pointing to right-of-way and construction costs of the quadrant road.
(or flyover
) over a less traveled, slower road. This design is also referred to as a single-loop intersection.
area, in the Greater Toronto Area
in Ontario
, Canada, examples include:
Proponents also point to a reduction in points where accidents could occur from vehicles potentially crossing paths as well as a low development cost over roundabout
Roundabout
A roundabout is the name for a road junction in which traffic moves in one direction around a central island. The word dates from the early 20th century. Roundabouts are common in many countries around the world...
or the more complex single-point urban interchange
Single-point urban interchange
A single-point urban interchange , also called a single-point interchange or single-point diamond interchange , is a type of highway interchange...
designs. Opponents point to the increase in points where accidents could occur with merging traffic as well as the non-traditional nature of the design which has the potential to confuse drivers. Opponents also refute low cost claims pointing to right-of-way and construction costs of the quadrant road.
Variants
Single quadrant intersections (pictured above) feature a single quadrant road. Double quadrant intersections add an additional quadrant road placed opposite of the other quadrant road. Another variant links grade-separated roads via the quadrant road, typically to bring together a faster road with denser traffic with an overpassOverpass
An overpass is a bridge, road, railway or similar structure that crosses over another road or railway...
(or flyover
Overpass
An overpass is a bridge, road, railway or similar structure that crosses over another road or railway...
) over a less traveled, slower road. This design is also referred to as a single-loop intersection.
Canada
The single-loop variant is used frequently in the ThornhillThornhill, Ontario
Thornhill is a community in the Greater Toronto Area of Southern Ontario, Canada, located on the northern border of the city of Toronto. Once a municipal village, Thornhill is now a community and postal designation geographically split into two municipalities along Yonge Street, the city of...
area, in the Greater Toronto Area
Greater Toronto Area
The Greater Toronto Area is the largest metropolitan area in Canada, with a 2006 census population of 5.5 million. The Greater Toronto Area is usually defined as the central city of Toronto, along with four regional municipalities surrounding it: Durham, Halton, Peel, and York...
in Ontario
Ontario
Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....
, Canada, examples include:
- http://maps.google.ca/maps?f=q&hl=en&geocode=&q=mississauga,+ontario&ie=UTF8&ll=43.59455,-79.600689&spn=0.004398,0.009978&t=h&z=17&om=1 Dundas Street and Cawthra Road, Mississauga, Ontario
- http://maps.google.ca/maps?f=q&hl=en&geocode=&q=mississauga,+ontario&ie=UTF8&ll=43.822174,-79.477201&spn=0.008763,0.019956&t=h&z=16&om=1 Highway 7Highway 7 (Ontario)King's Highway 7, commonly referred to as Highway 7 and historically as the Northern Highway, is a provincially maintained highway in the Canadian province of Ontario...
, Langstaff Road, and Dufferin Street, Vaughan, OntarioVaughanVaughan is a city in York Region north of Toronto, Ontario, Canada. Vaughan is the fastest growing municipality in Canada achieving a population growth rate of 80.2% between 1996–2006, according to Statistics Canada having nearly doubled in population since 1991. Vaughan is located in Southern... - http://maps.google.ca/maps?f=q&hl=en&geocode=&q=mississauga,+ontario&ie=UTF8&ll=43.829759,-79.453726&spn=0.008761,0.019956&t=h&z=16&om=1 Highway 7 and Bathurst Street, also in Vaughan, Ontario
- http://maps.google.ca/maps?f=q&hl=en&geocode=&q=mississauga,+ontario&ie=UTF8&ll=43.836554,-79.429007&spn=0.00876,0.019956&t=h&z=16&om=1 Highway 7 and Yonge StreetYonge StreetYonge Street is a major arterial route connecting the shores of Lake Ontario in Toronto to Lake Simcoe, a gateway to the Upper Great Lakes. It was formerly listed in the Guinness Book of Records as the longest street in the world at , and the construction of Yonge Street is designated an "Event of...
, Markham, OntarioMarkham, OntarioMarkham is a town in the Regional Municipality of York, located within the Greater Toronto Area of Southern Ontario, Canada. The population was 261,573 at the 2006 Canadian census... - http://maps.google.ca/maps?f=q&hl=en&geocode=&q=mississauga,+ontario&ie=UTF8&ll=43.840455,-79.408128&spn=0.00876,0.019956&t=h&z=16&om=1 Highway 7 and Bayview Street, Markham, Ontario
- http://maps.google.com/maps?ie=UTF8&hl=en&ll=43.875731,-78.875442&spn=0.002927,0.005021&t=h&z=18 Bloor Street and Stevenson Road, Oshawa, OntarioOshawaOshawa is a city in Ontario, Canada, on the Lake Ontario shoreline. It lies in Southern Ontario approximately 60 kilometres east of downtown Toronto. It is commonly viewed as the eastern anchor of both the Greater Toronto Area and the Golden Horseshoe. It is now commonly referred to as the most...
United States
- http://maps.google.com/maps?f=q&hl=en&sll=43.875731,-78.875442&sspn=0.002811,0.004828&ie=UTF8&ll=41.074571,-81.518257&spn=0.00147,0.002414&t=h&z=19 Exchange St. and Wolf Ledges Pkwy., Akron, OhioAkron, OhioAkron , is the fifth largest city in the U.S. state of Ohio and the county seat of Summit County. It is located in the Great Lakes region approximately south of Lake Erie along the Little Cuyahoga River. As of the 2010 census, the city had a population of 199,110. The Akron Metropolitan...
(The quadrant roadway has its own name, Arc Dr., but has no driveways or addresses and serves solely as the quadrant roadway.) - http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=owings+mills,+md&sll=41.074747,-81.518345&sspn=0.001466,0.002403&ie=UTF8&ll=39.418744,-76.779301&spn=0.002905,0.004807&t=h&z=18&iwloc=addr Maryland Route 140Maryland Route 140Maryland Route 140 is a local long route in northern Maryland, United States.-Route description:MD 140 is known by various names depending on location; south of Reisterstown it is known as Reisterstown Road. Though Reisterstown itself is named after John Reister, the road is named after Jacob...
and Owings Mills Blvd. in Owings Mills, MarylandOwings Mills, MarylandOwings Mills is an unincorporated community and a census-designated place in Baltimore County, Maryland, United States. It is a suburb of Baltimore. The population was 20,193 at the 2000 census. Owings Mills is home to the northern terminus for the Baltimore Metro Subway and to Owings Mills Mall.... - http://maps.google.com/maps?f=q&hl=en&sll=43.875731,-78.875442&sspn=0.002811,0.004828&ie=UTF8&ll=41.074571,-81.518257&spn=0.00147,0.002414&t=h&z=19 New York Route 130 Broadway St. and New York Route 277 Union Rd. in Depew, New YorkDepew, New YorkDepew is a village in Erie County, New York, United States. The population was 16,629 at the 2000 census. It is part of the Buffalo–Niagara Falls Metropolitan Statistical Area...
- http://maps.google.com/?ie=UTF8&ll=40.000186,-86.125216&spn=0.011391,0.01929&t=h&z=16 Meridian St. and 146 St. via Greyhound Pass in Carmel, IndianaCarmel, IndianaCarmel is a city in Hamilton County, Indiana, United States located immediately north of Indianapolis, Indiana. The population was 79,191 at the 2010 census, and is one of the most affluent communities in the Midwest....
- Birmingham, Michigan – Woodward Ave & Maple Rd. Peadbody Street is used as the quadrant road.
- Golden Triangle, New Jersey – Kaighns Ave and Chapel Ave
- Wallingford, Connecticut – Colony Rd & Church St
- Lansing, Michigan - Martin Luther King Ave. at Grand River Ave.
- Cary, North Carolina, High House Road and Cary ParkwayCary ParkwayThe Cary Parkway is a major semi-circular route through Cary, North Carolina. The parkway serves approximately as Cary's outer ring highway, though it does not form a complete circle like the inner ring, Maynard Road...
(proposed) - Billings, Montana, Hilltop Road and Lake Elmo Drive.
Germany
- http://maps.google.de/maps?client=opera&rls=de&q=51.479245,7.459288&oe=utf-8&channel=suggest&um=1&ie=UTF-8&hq=&hnear=%2B51%C2%B0+28'+43.14%22,+%2B7%C2%B0+27'+29.77%22&gl=de&ei=-jG0TYTKI8eUOqehgcAJ&sa=X&oi=geocode_result&ct=title&resnum=1&ved=0CBkQ8gEwAA Dortmund, Northrhein-Westphalia, Ardey-/Hagener Straße and Stockumer Straße