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Horizontal and vertical alignment
Where drivers cannot see ahead properly, often the risk of accidents increases. Particularly this happen where there are bends or the crest of a hill. Where the two occur together there may be more accidents if the driver’s perception of the environment is in any way faulty. A road user’s perception of horizontal and vertical alignment can often be manipulated to act as a perceptual countermeasure, with the road users driving in a generally safer manner suitable to their perception of comfortable travel.