Off-Ramp Vehicle Mandatory Lane-Changing Duration in Small Spacing Section of Tunnel-Interchange Section Based on Survival Analysis

Table 4

Statistical results of MLCD under the influence of different spacings.

Spacing (m)	Total cases	Invalid cases	Average				Median				Log-ran test
			Estimate	Standard error	95% confidence interval		Estimate	Standard error	95% confidence interval
					Lower	Upper			Lower	Upper
300	42	8	3.802	0.208	3.395	4.209	3.966	0.123	3.725	4.207	0.000
400	42	6	5.815	0.286	5.254	6.375	5.450	0.206	5.046	5.854	—
500	42	0	7.449	0.214	7.030	7.868	7.750	0.139	7.477	8.023	—
600	42	0	6.907	0.300	6.320	7.494	7.400	0.366	6.683	8.117	—

Log-rank test is used to determine whether there are significant differences between survival functions. indicates a significant difference; indicates no significant difference.