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Right-in/right-out

Right-in/right-out (RIRO) and left-in/left-out (LILO) refer to a type of three-way road intersection where turning movements of vehicles are restricted. A RIRO permits only right turns and a LILO permits only left turns. "Right-in" and "left-in" refer to turns from a main road into an intersection (or a driveway or parcel); "right-out" and "left-out" refer to turns from an intersection (or a driveway or parcel) to a main road.[1][2][3] RIRO is typical when vehicles drive on the right, and LILO is usual where vehicles drive on the left. This is because minor roads usually connect to the outsides of two-way roads. However, on a divided highway, both RIRO and LILO intersections can occur.

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.

(Lower left) RIRO ramps on and off a divided highway connecting to the Remetinec Roundabout in Zagreb, Croatia.
A right-in/right-out intersection at the entrance to the National Institutes of Health along Maryland Route 355 in Bethesda, Maryland, United States.
King's Highway 11, looking north from overpass, toward South Sparrow Lake Road/Goldstein Road in Severn, Ontario, Canada.
Several characteristics of a RIRO expressway are shown in the image: there is an unbroken median, there are right-in/right-out turns at the side roads, there are businesses with direct right-in/right-out frontage along the highway, and there is a sign indicating that access to the southbound lanes of the highway is via a right turn onto the side road (in this case, by following Goldstein Road to the overpass road, crossing over the highway, then continuing on the overpass road to South Sparrow Lake Road).
King's Highway 11, looking south from same overpass. In addition to the unbroken median, this image shows another characteristic of a RIRO expressway: direct right-in/right-out access to driveways (in this case, residential).
  1. ^ "Title 930 (Transportation, Preconstruction), Rule R930-6 (Access Management)" (PDF). Utah Administrative Code. Utah Department of Transportation. August 2013. Retrieved September 12, 2015.
  2. ^ "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.
  3. ^ "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.

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