Safety Effects of Horizontal Curve Design and Lane and Shoulder Width on Single Motorcycle Accidents in Norway

Table 4

Combinations describing the horizontal alignment in the statistical model.

Curve type	Degree of curvature	Adjacent curve requirements	Number of segments	Percentage of segments
Straight			430	45.74%
Single curve	High		67	7.13%
Single curve	Low		6	0.64%
Multiple curves in the same direction	High	OK	15	1.60%
Multiple curves in the same direction	High	NOT OK	1	0.11%
Multiple curves in the same direction	Low	OK	40	4.26%
Multiple curves in the same direction	Low	NOT OK	58	6.17%
Multiple curves in opposite directions	High	OK	44	4.68%
Multiple curves in opposite directions	High	NOT OK	29	3.09%
Multiple curves in opposite directions	Low	OK	95	10.11%
Multiple curves in opposite directions	Low	NOT OK	155	16.49%