This is for indicating a priority for the right of way. The sign is used on roadways where traffic is required to stop before entering a major road. When you see this sign, you have to stop your vehicle and you can proceed past the stop line only after ascertaining that this will not cause danger to the traffic on the main road.
Installed on the left side of the approach to which it applies. The STOP sign is placed as close to the STOP line without obstructing vision to the major road. Normally, it is fixed 1.5m in advance of the stop line.
This is for assigning the right of way to traffic on certain roadways at intersections, the intention being that the vehicles controlled by the sign must give way, i.e., yield to other traffic having the right of way. When you see this sign, you need to slow down or stop when necessary to avoid any interference with conflicting traffic.
Installed in advance to the point where vehicles are required to stop or slow down. It is provided on the minor road to assign give way to major road traffic but the stop is not necessary; at roundabouts to give way to the traffic coming from the right; to give way to the traffic coming uphill on hill road; for roadside parking to give way to the traffic on the major road.