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IntroductionReviews of factors affecting road safety on both sides of the Atlantic have concluded that there is abundant evidence that road bends cause traffic collisions, and the sharper the curve, the greater the risk (Bissell et al, 1982;. Typical studies have involved dividing roads into short segments and have compared the number of road-traffic crashes on each road section with a measure of horizontal curvature, finding significant positive relationships between the degree of curve and crash rates. These studies have taken into account other factors that affect crash frequencies such as the length of the segment, traffic flow, carriageway width, edge treatment, vertical alignment (hilliness), and the number of junctions. By holding other risk factors constant in multiple-regression models, the hazardous nature of road bends has been demonstrated to be an independent effect. Examples include studies of modern rural trunk roads in the

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