Left-in, left-out is a restrictive intersection configuration that prevents vehicles from crossing opposing traffic lanes. A physical median barrier forces drivers entering the main road to turn left, and only allows left turns from the main road into the side street. This design reduces conflict points and improves traffic flow on the arterial road.
We're converting that dangerous cross-street into a LILO to eliminate the broadside collisions.
In countries that drive on the right, the equivalent concept is Right-in, right-out (RIRO).
Also heard as
- left-in, left-out
Related terms
Traffic island
A raised or painted area in a roadway designed to separate traffic streams or protect pedestrians.
Chicane
A series of alternating curves or lane shifts built into a roadway to slow down traffic.
Turning point
A designated location where a transit vehicle reverses direction to begin its return trip.