Road Closure Signs
Regulatory closure signs — road closed, road closed ahead, and road closed to thru traffic — used at and ahead of a California closure.
Road closure signs notify and regulate traffic at a full or partial roadway closure. The regulatory ROAD CLOSED (R11-2) sign is posted at the closure point — typically on a Type III barricade across the roadway — while ROAD CLOSED AHEAD (R11-3a) and the warning sign W20-3 give advance notice so drivers can turn or follow a detour.
When local access must be preserved, ROAD CLOSED TO THRU TRAFFIC (R11-4) closes the road to through movement while still allowing residents, businesses, and deliveries to reach properties within the closure. Every closure should be backed by advance warning and a signed detour or local-access plan.
In Los Angeles, full closures typically require coordination with LADOT for signal timing, LA County Metro where transit routes are affected, and public-notice requirements under City or county ordinance. On state highways in LA County, Caltrans District 7 reviews the encroachment permit. Confirm that closure limits on the plan match the approved permit exactly.
Warns that the road ahead is closed and that through travel will not be possible, giving drivers time to turn or follow a detour before reaching the closure.
A regulatory sign stating that the road is closed to all traffic, posted at the closure point typically on a barricade across the roadway.
A regulatory sign advising that the road is closed ahead, often with a local-traffic or detour message, so drivers can prepare to turn or detour.
A regulatory sign stating that through travel is closed while still allowing local access to properties within the closure.
Educational reference only. This is not an official Caltrans, FHWA, or local agency publication and is not legal or engineering advice. Always verify sign selection, size, placement, spacing, and application against the current CA MUTCD 2026, Caltrans sign specifications, Standard Plans, project documents, and the reviewing agency’s requirements.
Frequently Asked Questions
What is the difference between ROAD CLOSED and ROAD CLOSED TO THRU TRAFFIC?
ROAD CLOSED (R11-2) closes the road to all traffic at the closure point. ROAD CLOSED TO THRU TRAFFIC (R11-4) closes the road to through movement but still allows local access to properties within the closure.
What sign goes on the barricade at a full closure?
The regulatory ROAD CLOSED (R11-2) sign is commonly mounted on a Type III barricade across the roadway at the closure point, with advance warning and detour signing upstream.
Do road closures in Los Angeles require special coordination?
Often, yes. Full closures may require LADOT coordination for signal timing, LA County Metro coordination if transit is affected, and public notice under local ordinance. State highway closures are reviewed by Caltrans District 7.
Is a detour always required for a closure?
A closure should provide a way for affected traffic to continue — either a signed detour for through traffic or clear local-access provisions. The right approach depends on the closure type and the reviewing agency's requirements.
Closing a road on a California project?
Public Ready can provide road closure signs, barricades, and detour signing, and help you align closure limits with your permit conditions.
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