Analysis of Freeway Secondary Crashes in Different Traffic Flow States by Three-Phase Traffic Theory

Table 4

The estimation results of the traditional logistic regression models.

Variables	Coefficient	S.D.	P>|z|	2.50%	97.50%
Free flow (F)
Spd	−0.144	0.022	0.0001	−0.187	−0.100
Stdc	0.472	0.146	0.001	0.185	0.759
Lstdo	13.093	4.187	0.002	4.886	21.300
Ss	−1.306	0.533	0.014	−2.351	−0.261
Cons	2.511	1.487	0.091	−0.403	5.425
Synchronized flow (S)
Lw	3.295	1.005	0.001	1.325	5.264
Os	0.274	0.126	0.029	0.027	0.520
Occ	12.822	4.849	0.008	3.318	22.325
Stdo	−9.711	4.097	0.018	−17.742	−1.681
Lspd	0.087	0.043	0.043	0.003	0.171
Ho	1.403	0.829	0.091	−0.222	3.027
Cons	−48.560	13.309	0.0001	−74.645	−22.476
Wide moving jams (J)
Stdo	20.025	8.668	0.021	3.037	37.014
Lcnt	−1.685	0.576	0.003	−2.813	−0.556
Cons	−6.809	1.697	0.0001	−10.135	−3.483
The transitional state from free flow to synchronized flow (F⟶S)
Is	−0.275	0.126	0.029	−0.521	−0.029
Dc	−0.764	0.280	0.006	−1.313	−0.215
Occ	26.222	9.524	0.006	7.556	44.888
Co	8.109	2.639	0.002	2.936	13.281
Lstdo	−23.091	10.220	0.024	−43.122	−3.060
Cons	−8.399	2.144	0.0001	−12.602	−4.197
The transitional state from synchronized flow to free flow (S⟶F)
C	−4.475	1.635	0.006	−7.681	−1.270
Ds	0.077	0.047	0.100	−0.015	0.170
Ss	1.459	0.789	0.065	−0.088	3.005
Cons	−1.254	0.912	0.169	−3.041	0.534
The transitional state from synchronized flow to wide moving jams (S⟶J)
Is	−0.241	0.118	0.041	−0.473	−0.010
Dc	−0.695	0.288	0.016	−1.258	−0.131
Stdo	9.106	4.366	0.037	0.548	17.663
Cons	−1.586	1.119	0.156	−3.780	0.607
The transitional state from wide moving jams to synchronized flow (J⟶S)
Tr	7.849	3.412	0.021	1.161	14.536
Cs	−27.593	14.976	0.065	−56.945	1.759
Cons	0.442	2.240	0.844	−3.948	4.831