RockfallUnited States
Traffic rules
United States
29. Rockfall
A rockfall warning indicates a road section where rocks or stones may fall from a cliff, cutting or steep slope, or where fallen material may already be present on the road. The danger may affect the full roadway and can appear suddenly.
Drivers should reduce speed, scan the road and slopes ahead, increase their following distance and remain prepared to stop. They should avoid unnecessary stopping in the exposed section and never attempt to move unstable rocks themselves.
Wikimedia.org • cogdogblog • CC BY
Where might falling rocks be a hazard on roads in the United States?
Pay extra attention around canyon roads, mountain passes and steep rock cuttings. After heavy rain, freeze–thaw cycles or work on a steep slope, the hazard may increase depending on local conditions.
Does a falling-rocks warning sign in the United States impose a speed limit?
A falling-rocks sign is a hazard warning, not normally a numerical speed-limit sign. Follow any separate speed or closure signs, slow down to match visibility and conditions, and watch for material already on the road.
Warning for falling rocks.
English • W50-1(CA) • Rock-slide area. Warns that rocks may fall or slide onto the road. Reduce speed and watch for debris. California design, documented as W50-1(CA) in the Caltrans sign specifications.
Sources
🔗 Commons.wikimedia.org
🔗 Dot.ca.gov • Caltrans: W50-1(CA) specification
SVG source: California Department of Transportation • Public domain • Original revision 2024-05-22. Wikimedia original unmodified.
What should you do if rocks are blocking the road in the United States?
Slow or stop in a safe place away from the exposed slope if possible. Do not drive over unstable debris or stop beneath a cliff unnecessarily. Follow any closure or traffic-control instructions and report a dangerous obstruction through the appropriate road authority or emergency channel.
