The traffic sign are divided into three classes; circles gives orders, triangles warns of possible dangers and rectangles gives information. Different colours are use within these shapes; blue circles are mandatory signs, it gives positive instructions, while red circles are prohibitory signs, it give negative instructions. Blue rectangles give general information while green rectangles are use for direction sign on main roads. However, there are three exception for these shapes and colour rules; that is the octagonal Stop sign, the diamond priority road sign and the inverted red triangle Give way sign.[1]
Warning signs
Warning signs indicates a hazard ahead on the road that may not be readily apparent to a driver.
Prohibitory signs are used to prohibit certain types of manoeuvres or some types of traffic. The No symbol surrounding a pictogram is used to indicate something that is not permitted.
Mandatory signs are used to set the obligations of all traffic which use a specific area of road. Unlike prohibitory or restrictive signs, mandatory signs tell traffic what it must do, rather than must not do.
Pass on the left
Pass on the right
Pass either side
Ahead only (turning left and right is prohibited)
Vehicular traffic must turn to the left ahead
Vehicular traffic must turn to the right ahead
Left turn only
Right turn only
Roundabout - Vehicles entering the junction must give way to traffic to vehicles coming from the right