第四章行車隧道及管制區
交通流量—城門隧道
| 年份 | 交通量（輛次） | |||
| 東行 | 西行 | 雙程合計 | 平均每日 | |
| 2010 | 8,603,094 | 8,701,666 | 17,304,760 | 47,410 |
| 2011 | 8,752,668 | 8,785,962 | 17,538,630 | 48,051 |
| 2012 | 8,902,780 | 8,989,772 | 17,892,552 | 48,887 |
| 2013 | 9,062,911 | 9,172,062 | 18,234,973 | 49,959 |
| 2014 | 9,265,758 | 9,378,078 | 18,643,836 | 51,079 |
| 2015 | 9,551,334 | 9,664,297 | 19,215,631 | 52,646 |
| 2016 | 9,743,678 | 9,881,296 | 19,624,974 | 53,620 |
| 2017 | 9,835,981 | 9,964,411 | 19,800,392 | 54,248 |
| 2018 | 9,778,002 | 9,957,439 | 19,735,441 | 54,070 |
| 2019 | 9,588,900 | 9,786,315 | 19,375,215 | 53,083 |