Crash Frequency Minimization with Severity Mitigation in Road Geometric Design Using Chance Constraint Programming Optimization

Table 4

25CBD model estimation results.

Significant variable	Coefficient estimate	t-statistic	Variable notation
Constant	−1.17	−3.82
Indicator of 10 ft lane width for each direction	−0.73	−3.51
Indicator of each direction on M st from 11th st to Centennial Mall st	1.19	3.84
Indicator of each direction on N st from Centennial st to 9th St	1.4	6.33
Directional average daily traffic per lane	−0.36D-05 (0.00012)	−0.05 (4.26)
Number of observations	300
Log-likelihood with constant only	−249.29
Log-likelihood at convergence	−218.29
McFadden pseudo R-squared	0.12
Chi squared	62.01
Info. criterion: AIC	1.50
Finite sample: AIC	1.50
Info. criterion: BIC	1.57

Random parameter, the standard deviation of parameter distribution is shown in parentheses.