Seagull intersection
A seagull intersection
Design
Seagull intersections get their name from the pattern that the two cross-traffic turn lanes make when looking down at them from the air.
In a seagull intersection, one or more lanes of traffic on the
Those wishing to turn across traffic into the side road at the intersection drive into the turn lane, which forms one "wing" of the seagull. Here, they meet the opposite carriageway and the side road. Traffic wishing to turn across traffic out of the side road, cross the intersecting carriageway, drive up the other "wing" of the seagull, and merge onto the other carriageway.[7]
For the arterial carriageway adjacent to the side road, access into and out of the side road is ordinarily handled like a conventional
Different methods are used to control traffic where two right-turning movements and the through movement meet. Most intersections use traffic lights, while others use
This design type has been proven to provide sustainable benefits when compared the traditional T-intersection design. By reducing delay through the intersection, automobiles use less fuel on average passing through the intersection, and thus emissions are reduced across the intersection. The savings per vehicle may not seem very significant, but when scaled to account for all automobiles passing through the intersection, the total emission savings are significant. Additionally, there are economic and social benefits to reducing delay time and allowing drivers to pass through the intersection quicker.
History
An experiment was done[
References
- ^ John Harper, Wal Smart, Michael de Roos: Seagull Intersection Layout. Island Point Road – A Case Study Archived 2013-05-07 at the Wayback Machine 2000 – 2010
- ^ Federal Highway Administration: Alternative Intersections/Interchanges: Informational Report (AIIR), Publication Number: FHWA-HRT-09-060, April 2010
- ^ )
- ^ Utah DOT: "5400 South". Archived from the original on 2013-12-13. Retrieved 2013-08-30.
- ^ Nevada DOT: US93 Lakeshore v4 Handouts
- ^ https://www.fhwa.dot.gov/publications/research/safety/16036/16036.pdf [bare URL PDF]
- ^ Intersection Decision Guide, Indiana Department of Transportation, Version 1.1 published 14 January 2014, retrieved 25 August 2015, P. 44
- ^ Edward S. Jarem: Safety and Operational Characteristics of Continuous Green Through Lanes at Signalized Intersections in Florida, Lake Mary, Florida 2004
- ^ Litsas, Stephen (July 31, 2012). "Evaluation of Continuous Green T-Intersections on Isolated Under-Saturated Four-Lane Highways" (PDF). TRB.org. Retrieved September 19, 2013.
- ^ Cycling past red lights in the Netherlands, YouTube, published 24 October 2012