Warning Signs are used to warn traffic of potentially hazardous conditions on, or adjacent to the road. Warning signs advise of conditions which require caution on the part of the driver, and may call for a reduction in speed in the interest of the driver’s safety and that of other road users.

These signs tend to lose their effectiveness if used unnecessarily or too frequently and their use should be restricted to the minimum consistent with safety. A warning sign should not generally be used if under normal conditions the driver can be expected to see and appreciate the potential hazard ahead.

The sub-classifications and the prefix and series number relevant to each are as follows:

W1            Alignment Series

W2            Intersection and Junction Series

W3            Advance Warning of Traffic Control Device Series

W4            Road Width, Low and Narrow Clearance Series

W5            Road Obstacle Series

W6            Pedestrian, Bicycle and School Series

W7            Railway Level Crossing Series

W8            Auxiliary Series

W9            Modified Intersection Series

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