Right-in/right-out
Right-in/right-out (RIRO) and left-in/left-out (LILO) refer to a type of
The remainder of this article refers only to RIRO but applies equally to LILO.
A RIRO intersection differs from a 3/4 intersection (right in/right out/left in) and an unrestricted intersection.
Design
RIRO is an important tool of access management, itself an important component of transportation planning. A study applying access management guidelines to the redesign of Missouri Route 763 in Columbia, Missouri[4] illustrates how RIRO, combined with signalized intersections designed to permit U-turns, can accommodate high volumes of traffic with low delay and high safety.
The RIRO restriction typically is enforced through physical barriers such as a
RIRO roads may also have grade-separated interchanges, but vehicles on these roads do not yield the right-of-way to other vehicles entering the roadway, nor encounter cross traffic. Such roads are sometimes called RIRO expressways. In the United States, they are sometimes called Jersey freeways, due to their prevalence in the state of New Jersey, although they are not limited to that state.
Use
RIRO road configurations are an important tool for
Safety
RIRO configurations generally improve
A RIRO configuration may improve safety and operations at one intersection while consequently worsening them at another intersection upstream or downstream.[citation needed]
References
- ^ "Title 930 (Transportation, Preconstruction), Rule R930-6 (Access Management)" (PDF). Utah Administrative Code. Utah Department of Transportation. August 2013. Retrieved September 12, 2015.
- ^ "Title 930 (Transportation, Preconstruction), Rule R930-6-5 (Access Management, Definitions)". Utah Administrative Code. Utah Department of Administrative Services, Division of Administrative Rules. August 1, 2015. Retrieved September 12, 2015.
- ^ "Access Management Manual, Chapter 3 (Guidelines for Public Street and Driveway Connections), 3.4.6 (Restricted Movements and Median Openings)" (PDF). Minnesota Department of Transportation. January 2, 2008. Retrieved September 12, 2015.
- ^ Kenny Voss and Trent Brooks and Tim Rogaczewski and Michael Trueblood (2008). "Implementing MoDOT's Access Management Guidelines Along Route 763" (PDF). 7th National Conference on Access Management. Transportation Research Board, Access Management Committee AHB70: 13. Retrieved 2009-06-24.