Discrete Dynamics in Nature and Society

Research Article

Distinguishing between Rural and Urban Road Segment Traffic Safety Based on Zero-Inflated Negative Binomial Regression Models

Table 3

-test statistics for rural and urban segment comparison.


Road function	Lane	Variable	District	N	Mean	Standard deviation	Mean difference	P value

Interstate	2	Per_lane_ Mile	Rural Urban	30 86	2.06 4.52	1.12 4.63	−2.456	0.000
	2	Per_100 MVMT	Rural Urban	30 86	45.31 77.14	25.07 79.69	−31.83	0.001
	4	Per_lane_ Mile	Rural Urban	1 4	0.00 1.16	— 2.21	−1.167	—
	4	Per_100 MVMT	Rural Urban	1 4	0.00 30.18	— 56.91	−30.184	—

Expressway	2	Per_lane_ Mile	Rural Urban	2 151	0.44 2.31	0.62 3.37	−1.873	0.074
	2	Per_100 MVMT	Rural Urban	2 151	19.83 75.06	28.05 112.07	−55.233	0.171
	4	Per_lane_ Mile	Rural Urban	0 77	— 1.26	— 2.34	—	—
	4	Per_100 MVMT	Rural Urban	0 77	— 43.08	— 74.91	—	—

P_Arterial	2	Per_lane_ Mile	Rural Urban	91 162	0.57 1.19	0.76 1.97	−0.621	0.000
	2	Per_100 MVMT	Rural Urban	91 162	34.01 59.85	44.34 102.08	−25.837	0.006
	4	Per_lane_ Mile	Rural Urban	9 592	0.54 0.90	0.44 1.79	−0.363	0.546
	4	Per_100 MVMT	Rural Urban	9 592	23.99 91.62	19.57 357.28	−67.630	0.571

M_Arterial	2	Per_lane_ Mile	Rural Urban	241 783	0.29 0.60	0.78 1.20	−0.307	0.000
	2	Per_100 MVMT	Rural Urban	241 783	108.70 133.16	424.56 436.68	−24.454	0.444
	4	Per_lane_ Mile	Rural Urban	0 532	— 0.59	— 1.41	—	—
	4	Per_100 MVMT	Rural Urban	0 532	— 105.56	— 246.18	—	—

Total comparison
		Per_lane_ Mile	Rural Urban	374 2387	0.51 0.99	0.93 2.07	−0.480	0.000
		Per_100 MVMT	Rural Urban	374 2387	82.64 102.96	343.16 331.91		0.133