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Vertical white rectangle with a black border and four lines of black text reading KEEP RIGHT EXCEPT TO PASS.
MUTCD
R4-16
Category
regulatory
Color
white
Shape
rectangle vertical

Keep Right Except To Pass

Travel in the right lane on a multi-lane roadway and use the left lane only to pass slower vehicles.

On multi-lane highways posted with this regulation, the right-hand lane is the normal travel lane and the left lane is reserved for passing. Drivers cruising in the left lane must move right after completing a pass so faster traffic can use it. Common on rural interstates and divided highways where slower-lane discipline keeps traffic flowing and reduces lane-blocking.

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