Sign PREP-083 “NO ROCK COLLECTING” as specified by the California Department of Transportation for use with the <i><a href="https://en.wikipedia.org/wiki/California_Manual_on_Uniform_Traffic_Control_Devices" class="extiw" title="w:California Manual on Uniform Traffic Control Devices">California Manual on Uniform Traffic Control Devices</a></i>, with text converted to paths for display.
California Department of Transportation
<a rel="nofollow" class="external text" href="https://dot.ca.gov/-/media/dot-media/programs/traffic-operations/documents/prep-series-2-line-a11y.pdf">2-line PREP Series Educational Plaques</a>