Editing Right-in/right-out (section)

{{Short description|Type of road intersection}}
'''Right-in/right-out''' ('''RIRO''') and '''left-in/left-out''' ('''LILO''') refer to a type of [[three-way junction|three-way road intersection]] where turning movements of [[vehicle]]s 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 [[land lot|parcel]]); "right-out" and "left-out" refer to turns ''from'' an intersection (or a driveway or parcel) to a main road.<ref> {{cite web | url = http://www.udot.utah.gov/main/uconowner.gf?n=11066229893635233 | title = Title 930 (Transportation, Preconstruction), Rule R930-6 (Access Management) | work = Utah Administrative Code | publisher = [[Utah Department of Transportation]] | format = PDF | date = August 2013 | access-date = September 12, 2015 }} </ref><ref> {{cite web | url = http://www.rules.utah.gov/publicat/code/r930/r930-006.htm#T5 | title = Title 930 (Transportation, Preconstruction), Rule R930-6-5 (Access Management, Definitions) | work = Utah Administrative Code | publisher = Utah Department of Administrative Services, Division of Administrative Rules | date = August 1, 2015 | access-date = September 12, 2015 }} </ref><ref> {{cite web | url = http://www.dot.state.mn.us/accessmanagement/docs/pdf/manualchapters/chapter3.pdf | title = Access Management Manual, Chapter 3 (Guidelines for Public Street and Driveway Connections), 3.4.6 (Restricted Movements and Median Openings) | publisher = [[Minnesota Department of Transportation]] | format = PDF | date = January 2, 2008 | access-date = September 12, 2015 }} </ref> RIRO is typical when vehicles [[Left- and right-hand traffic|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 road]]s.  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.

[[File:Rotor Zagreb-crop.jpg|thumb|(Lower left) RIRO ramps on and off a divided highway connecting to the [[Remetinec Roundabout]] in [[Zagreb|Zagreb, Croatia]].]]
[[Image:2007 09 14 - MD355 @ NIH Visitor Access 2.JPG|thumb|right|A right-in/right-out intersection at the entrance to the [[National Institutes of Health]] along [[Maryland Route 355]] in [[Bethesda, Maryland]], [[United States]].]]
[[File:11 cl km 141-1 north lg.jpg|thumb|left|[[Ontario Highway 11|King's Highway 11]], looking north from overpass, toward South Sparrow Lake Road/Goldstein Road in [[Severn, Ontario]], [[Canada]].<br>Several characteristics of a ''RIRO expressway'' are shown in the image: there is an unbroken [[central reservation|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 [[carriageway|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).]]
[[File:11 cl km 141-1 south lg.jpg|thumb|left|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).]]