第四章行車隧道及管制區
交通流量—西區海底隧道
| 年份 | 交通量（輛次） | |||
| 南行 | 北行 | 雙程合計 | 平均每日 | |
| 2010 | 9,724,843 | 9,832,011 | 19,556,854 | 53,580 |
| 2011 | 10,334,138 | 10,452,681 | 20,786,819 | 56,950 |
| 2012 | 10,975,847 | 11,149,635 | 22,125,482 | 60,452 |
| 2013 | 11,216,731 | 11,397,394 | 22,614,125 | 61,957 |
| 2014 | 11,422,736 | 11,583,613 | 23,006,349 | 63,031 |
| 2015 | 11,762,751 | 12,080,907 | 23,843,658 | 65,325 |
| 2016 | 12,207,828 | 12,470,139 | 24,677,967 | 67,426 |
| 2017 | 12,210,884 | 12,455,963 | 24,666,847 | 67,580 |
| 2018 | 12,521,701 | 12,692,898 | 25,214,599 | 69,081 |
| 2019 | 12,646,400 | 12,822,664 | 25,469,064 | 69,778 |