Safety Evaluation for Highway Geometric Design Based on Spatial Path Properties

Table 6

Results of correlation analysis of crash rate and spatial curve under different road conditions.

	CR	AV of curvature	SD of curvature	CV of curvature	AV of torsion	SD of torsion	CV of torsion
CR	1	0.830^∗∗	0.828^∗∗	0.826^∗∗	0.823^∗∗	0.908^∗∗	0.785^∗∗
AV of curvature	0.830	1	0.963^∗∗	0.999^∗∗	0.649^∗∗	0.797^∗∗	0.949^∗∗
SD of curvature	0.828^∗∗	0.963^∗∗	1	0.961^∗∗	0.719^∗∗	0.831^∗∗	0.915^∗∗
CV of curvature	0.826^∗∗	0.999^∗∗	0.961^∗∗	1	0.638^∗∗	0.792^∗∗	0.950^∗∗
AV of torsion	0.823^∗∗	0.649^∗∗	0.719^∗∗	0.638^∗∗	1	0.769^∗∗	0.697^∗∗
SD of torsion	0.908^∗∗	0.797^∗∗	0.831^∗∗	0.792^∗∗	0.769^∗∗	1	0.798^∗∗
CV of torsion	0.785^∗∗	0.949^∗∗	0.915^∗∗	0.950^∗∗	0.697^∗∗	0.798^∗∗	1

^∗ p < 0.05, ^∗∗p < 0.01.