Offset T-intersection explained

An offset T-intersection^[1] is an at-grade road intersection where a conventional four leg intersection is split into two three-leg T-intersections to reduce the number of conflicts and improve traffic flow.^[2] Building the offset T-intersections as continuous green T-intersections (also called seagull intersection), there is a single stop on the arterial road, only.^[3] A higher volume of through traffic on the cross road,^[4] or on unsignalized intersections, a rebuild to a conventional four-leg intersection may be adequate, also when the offset is a few feet only like staggered junctions causing slower traffic for a longer time on the arterial road.^[5]

Seen as a spur route or access road, offset T-intersections can be seen as an A2 or B2 type partial cloverleaf interchange with no arterial road.^[6]

See also

• Split intersection
• Hamburger intersection (Throughabout)

Notes and References

1. Book: Federal Highway Administration . Federal Highway Administration . https://www.fhwa.dot.gov/publications/research/safety/09060/006.cfm . Alternative Intersections/Interchanges: Informational Report (AIIR) . Chapter 6.3.4 . Federal Highway Administration . FHWA-HRT-09-060 . April 2010 . 8 May 2016.
2. Book: Indiana Department of Transportation . Indiana Department of Transportation . Intersection Decision Guide . 14 January 2014 . Indiana Department of Transportation . 8 May 2016 . 43.
3. Book: Transportation Research Board . Transportation Research Board . National Cooperative Highway Research Program (NCHRP) Report 650: Median Intersection Design for Rural High-Speed Divided Highways . 2010 . 92–99 . doc. P. 84–91 . Transportation Research Board.
4. Book: Federal Highway Administration . Intersection Safety Strategies Brochure . FHWA-SA-08-008 . July 2008 . Federal Highway Administration . 8 May 2016.
5. Book: Institute of Transportation Engineers . Institute of Transportation Engineers . Convert Two Offset T-Intersections to a Single Four-Legged Intersection . Institute of Transportation Engineers . 8 May 2016 . https://web.archive.org/web/20160510143843/http://www.ite.org/uiig/treatments/42%202%20T-Intersections%20to%20Four-Leg.pdf?pass=84 . 10 May 2016 . dead .
6. Book: Institut für Straßen- und Eisenbahnwesen am KIT . Entwurf und Bau von Straßen – Teil: Straßenentwurf . Institut für Straßen- und Eisenbahnwesen am KIT . 7 September 2013 . SE–5–18 –20 . de.