R1 Series — Stop and Yield Signs

The R1 Series is the foundational right-of-way control series, covering STOP (R1-1) and YIELD (R1-2). These signs establish legal stop and yield obligations at intersections and access points. In temporary traffic control, R1 signs may appear at temporary intersections created by a detour, at flagging check-points where vehicles must stop before proceeding, or wherever a permanent signal has been knocked out and stop-control is required.