Interactive Influence Analysis of Tunnel Lateral Clearance on Driving Behavior Using Expressway Field Data

Table 9

Driving performance statistics of small car drivers with different lateral clearances.

	Scheme number	Operating speed (km/h)	Speed increase or decrease ratio (%)	Speed standard deviation (km/h)
Right lateral clearance	Scheme 1	123.4	—	6.7
	Scheme 2	121.2	1.8↓	5.6
	Scheme 3	128.0	3.7↑	8.5
Left lateral clearance	Scheme 1	121.6	—	8.7
	Scheme 2	126.3	3.9↑	7.6

Note. “↑” and “↓” indicate that, relative to Scheme 1, the indicator is increased or decreased.