Impact of Tunnel Groups on Pupil Diameter of Drivers on Mountainous Freeway in China: A Real-World Driving Study

Table 1

Distribution of tunnels.

Serial number	Name of tunnel	Length (m)	Tunnel type	Spacing distance (m)
1	Pengjiaheba Tunnel	117	Short tunnel	—
2	Jianyangping Tunnel No. 2	1636	Long tunnel	2840
3	Jianyangping Tunnel No. 1	1420	Long tunnel	97
4	Putou Tunnel	2348	Extra-long tunnel	125
5	Lixian Tunnel	5500	Extra-long tunnel	6272
6	Weiguan Tunnel	1159	Long tunnel	306
7	Ganbao Tunnel	4582	Extra-long tunnel	622
8	Mudui Tunnel	2342	Long tunnel	1929
9	Puxigou Tunnel	394	Short tunnel	80
10	Xindianzi Tunnel	1871	Long tunnel	305
11	Xuecheng Tunnel No. 2	185	Short tunnel	3112
12	Xuecheng Tunnel No. 1	3463	Extra-long tunnel	216
13	Gucheng Tunnel	2911	Long tunnel	342
14	Tonghua Tunnel No. 2	3025	Extra-long tunnel	152
15	Tonghua Tunnel No. 1	2475	Long tunnel	105
16	Taoping Tunnel	2374	Long tunnel	818
17	Xiazhuang Tunnel	215	Short tunnel	6388
18	Sangping Tunnel	2181	Long tunnel	1656