Section 4Road Tunnels and Control Areas
Traffic Statistics – Discovery Bay Tunnel
| Year | Traffic (Vehicles) | |||
| Eastbound | Westbound | Total | Daily Average | |
| 2010 | 202,430 | 202,430 | 404,860 | 1,109 |
| 2011 | 204,855 | 204,855 | 409,710 | 1,122 |
| 2012 | 199,033 | 199,033 | 398,066 | 1,088 |
| 2013 | 219,248 | 219,248 | 438,496 | 1,201 |
| 2014 | 239,922 | 239,922 | 479,844 | 1,315 |
| 2015 | 369,412 | 369,412 | 738,824 | 2,024 |
| 2016 | 394,745 | 394,745 | 789,490 | 2,157 |
| 2017 | 420,951 | 420,951 | 841,902 | 2,307 |
| 2018 | 435,010 | 435,010 | 870,020 | 2,384 |
| 2019 | 439,448 | 439,448 | 878,896 | 2,408 |
