Seagull Intersection

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Transport node "Möwe" - Seagull, Continuous-Green-T, Turbo-T
Seagull intersection on Broadway in Everett, Washington .
Smaller Seagull transport hub

A traffic junction of the Seagull type , the English word for "seagull", is a three-armed, T-shaped, level traffic junction that connects the traffic direction opposite the junction with a left connection without conflict. It has different names around the world: in Australia and New Zealand Seagull Intersection , generally in the USA Continuous Green T-Intersection (CGT) , in the US states Utah and Nevada High-T Intersection , in Florida Turbo-T . The construction is particularly suitable for motorway-like roads that run in separate directional lanes and are not free of heights. In urban areas, non-motorized traffic is the only exception to conflict-free traffic management on the continuously green driving lane. This is therefore called Continuous Green Through Lane (CGTL) .

power

Depending on the volume of traffic, the permitted speeds and the clarity of the traffic, the Seagull Intersection does not necessarily require a traffic light. Jammed at locations of traffic lights and on the directions alternately occurring vehicle groups a seagull intersection resolves the conflict that the left-bending in both directions must be free and provides a longer window for tailgating.

In the case of alternating three-armed traffic nodes, so-called offset T intersections , which make a green wave difficult due to the unfavorable distance, the property of the free flowing main direction compared to the lateral direction can be helpful. This saves fuel and emissions.

Executions

The connection on the left requires a limited speed in order to enable the approaching vehicles to be threaded. Since the right driving to stop to use the right lane and the main direction not from traffic signal is controlled and is a priority, it requires at least one road marking , which keeps through traffic from the acceleration lane and prohibits the colliding traffic premature lane change. Unfamiliar markings can be overlooked on snowy roads or when visibility is poor. There are some traffic hubs of this type that safely separate the lanes with traffic islands.

Northern sub-junction of the Würselen AS, A 544

Examples

Germany

Austria and Hungary

T-shaped transport hub in Austria and Hungary
T-shaped traffic junction in Germany with restricted area
(no seagull)

In Austria and Hungary, since the 1980s, restricted areas or similar have increasingly been dispensed with. The area behind the left- turning lane has only been provided with arrows, prompting you to merge to the right in order to announce the following narrowing of the lane to the usual profile. There is often no protective road marking. Some more heavily used traffic hubs are provided with a longer and separating marked lane. The § 7 para. 4 of the Austrian Highway Code (StVO) from 1 October 1994 refers spongy to comparable situations.

Poland

Canada

Completed in Saskatoon in 2011:

United States

Florida

  • In Jacksonville along Roosevelt Boulevard and Main Street (both part of US-17) are 7 GCTLs, opened between 1972 and 1992
Florida traffic sign indicates a
"Continuous Green Through Lane".

Colorado

Nevada

Texas

Utah

Australia

New Zealand

Examples of other CGTLs

Web links

Individual evidence

  1. ^ A b John Harper, Wal Smart, Michael de Roos: Seagull Intersection Layout. Island Point Road - A Case Study. ( Memento from May 7, 2013 in the Internet Archive ) (Seagull traffic junction design - a case study; PDF; 318 kB) 2000-2010, accessed on August 29, 2013.
  2. ^ A b c Federal Highway Administration: Intersection Safety Case Study - Continuous Green T-Intersections. (PDF; 649 kB) Publication FHWA-SA-09-016 , 1994–2006, accessed on August 29, 2013.
  3. ^ Utah Department of Transportation: 5400 South Improvements. ( Memento of January 9, 2013 in the Internet Archive ) Retrieved August 30, 2013.
  4. ^ A b Nevada Department of Transportation: US 93 Improvements - Buchanan Boulevard to the Hoover Dam Interchange. Retrieved August 30, 2013.
  5. ↑ Jonathan Reid, PE : Unconventional arterial intersection design, management and operations strategies (PDF; 16.1 MB) Parsons Brinckerhoff . July 2004. Archived from the original on November 15, 2015. Info: The archive link was automatically inserted and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved September 9, 2012. @1@ 2Template: Webachiv / IABot / www.pbworld.com
  6. ↑ a b Thobias Sando, Deo Chimba, Valerian Kwigizile, Holly Walker: Safety Analysis of Continuous Green Lane Through Intersections. ( Memento of the original from September 3, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. In: Journal of the Transportation Research Forum. Vol. 50, No. 1, pp. 5-17, 2011. @1@ 2Template: Webachiv / IABot / www.trforum.org
  7. ↑ Stephen Litsas, Hesham Rakha: Evaluation of Continuous Green T-Intersections on 2 Isolated Under-Saturated Four-Lane Highways. Transportation Research Board, Washington 2013.
  8. ↑ University of Maryland, Attap: Unconventional Arterial Intersection Design. Continuous Green-T. ( Memento of February 8, 2012 in the Internet Archive ) On: attap.umd.edu. Retrieved May 30, 2014.
  9. ↑ SASKATCHEWAN MINISTRY OF HIGHWAYS AND INFRASTRUCTURE: ANNUAL REPORT 10–11. Retrieved December 18, 2013.
  10. ↑ Edward S. Jarem: Safety and Operational Characteristics of Continuous Green Through Lanes at signalized intersections in Florida. ( Memento of the original from September 3, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Lake Mary (Florida) 2004. @1@ 2Template: Webachiv / IABot / www.ite.org
  11. ↑ City of McAllen: Bicentennial & Lark: Continuous Green Intersection. Retrieved August 30, 2013.