
The purpose of the STOP AHEAD sign is to warn drivers of a downstream regulatory STOP sign. The oversize STOP AHEAD sign (WB-101) should be used to warn of an oversize STOP sign (RA-101), where the posted speed is 70 km/h or greater. The special oversize STOP AHEAD sign (WB-1101) should be used to warn of a special oversize STOP sign (RA-1101).