The Expert will be specific knowledgeable people at the Department of Transport, Arrive Alive Communications, the Road Traffic Management Corporation or others who might have the expertise to answer the question.
A 3-Way Stop sign is a STOP sign. The rules applicable to stopping are the same as for a Stop sign. The only difference is the sequence in which drivers must move off from the Stop line.
Road sign R1 - STOP sign (Per the Road Traffic Act)
Indicates to the driver of a vehicle that he or she shall stop his or her vehicle with its front end in line with such sign, or if stop line RTM1 is used in conjunction with such sign, immediately behind such stop line, and that such driver shall not proceed until it is safe to do so.
Road sign R1.3 - 3-Way STOP sign (Per the Road Traffic Act)
Indicates to the driver of a vehicle approaching a 3-way stop sign, that he or she shall act as for stop sign R1, and he or she shall not proceed into the junction, until every vehicle which has stopped at any other stop line at such junction before him or her and which would, in the normal course of events, cross the path of such driver's vehicle, has cleared the junction.
Official K53 Driving Test requirement - Intersections: Stop signs
At a 3-way or 4-way stop, yield to pedestrians and vehicles that arrived at the intersection before you.
In plain English...
• Vehicles must STOP at a 3-way stop. It is a STOP sign.
• The 3 or 4 supplementary plate means that vehicles must move off only after all other vehicles and pedestrians that arrived at the Stop line before them have moved off. (i.e. move off in the sequence in which they arrived)
• Vehicles may move off only when it is safe to do so - i.e. no vehicles or pedestrians still crossing in the intersection.