Reliability-Based Analysis of Sight Distance Modelling for Traffic Safety

Table 4

Comparison of values among the three models.

Group	ASD pair	Mean	St. dev.	value
All cases	2D-3D DTM		0.251	<0.001
	2D-3D DSM		0.277	<0.001
	3D DTM-3D DSM		0.295	<0.001
() Vegetation	2D-3D DTM		0.239	<0.001
	2D-3D DSM		0.274	<0.001
	3D DTM-3D DSM		0.318	<0.001
() Cut side	2D-3D DTM		0.204	0.344
	2D-3D DSM		0.208	0.005
	3D DTM-3D DSM		0.061	<0.001
() Crest	2D-3D DTM		0.189	0.012
	2D-3D DSM		0.189	0.012
	3D DTM-3D DSM		0.000
() Clear	2D-3D DTM		0.279	<0.001
	2D-3D DSM		0.256	<0.001
	3D DTM-3D DSM		0.137	0.001

correlation coefficient since the identical samples cannot be compared by the -test.