A New GNB Model of Crash Frequency for Freeway Sharp Horizontal Curve Based on Interactive Influence of Explanatory Variables

Table 2

Crash data.

Name of variable	Mean value	Standard deviation	MIN	MAX
Crash amount (/km/year)	3.307	8.814	0	15
AADT (10thansands pcu)	0.714	1.037	0.25	4.78
Length of segment (km)	0.860	0.017	0.56	1.18
Radius of segment (km)	0.624	0.041	0.31	1
Operation Time (years)	8.020	2.251	3	14