Spatial Influence Analysis of Traffic Safety in Diverging Areas between Freeway Segments and Off Ramps

Table 6

Parameter estimates for the significant variables at different buffer size.

Parameter	(Intercept)	Ramp.Lanes = 0	Ramp.Lanes = 1	Ramp.Length	Ramp_ADT	Speed_Limit
Crash_30feet		.5754	0		.313	.049
Crash_60feet		.692	0		.251	.016
Crash_90feet		.819	0		.195	.016
Crash_120feet		.869	0		.175	.012
Crash_150feet		1.015	0		.199	.012
Crash_180feet		1.208	0		.214	.012
Crash_210feet		.936	0		.214	.011
Crash_240feet	.457	.857	0		.191	.008
Crash_270feet	1.201	.819	0		.169	.003
Crash_300feet	1.469	.520	0		.143	.006

Dependent variables: Crash_30feet, Crash_60feet, Crash_90feet, Crash_120feet, Crash_150feet, Crash_180feet, Crash_210feet, Crash_240feet, Crash_270feet, and Crash_300feet.
Model: (Intercept), Ramp.Lanes, Ramp.Length, Ramp_ADT, Speed_Limit.
Set to zero because this parameter is redundant.