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Right-in/right-out
Type of road intersection / From Wikipedia, the free encyclopedia
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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/4/42/Rotor_Zagreb-crop.jpg/320px-Rotor_Zagreb-crop.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/84/11_cl_km_141-1_north_lg.jpg/640px-11_cl_km_141-1_north_lg.jpg)
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).
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/11_cl_km_141-1_south_lg.jpg/640px-11_cl_km_141-1_south_lg.jpg)