mutcd-part4k
MUTCD Part 4K — In-roadway warning lights
The official extract for this page opens here so a cited passage can be highlighted.
Official source: https://mutcd.fhwa.dot.gov/
MUTCD / NHTSA · mutcd-part4k
MUTCD Part 4K — In-roadway warning lights
Confirm on the official MUTCDAll national pages