Correct answer
Because they modify the normal rules for using the road in specific circumstances.
Temporary traffic-signalling elements are given that name because they modify the normal rules for using the road in specific circumstances, such as a bend with reduced visibility or a roadworks area.
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Because they modify the normal rules for using the road in specific circumstances.
Because they are found only in built-up areas and roundabouts.
Because they are used only in adverse weather conditions.
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