Southampton is an English Unitary Authority.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 680,500,000 | 571,700,000 | 354.1 miles (569.8 km) |
| 2001 | 676,100,000 | 568,800,000 | 355.0 miles (571.3 km) |
| 2002 | 691,000,000 | 581,600,000 | 355.9 miles (572.7 km) |
| 2003 | 682,300,000 | 567,600,000 | 356.9 miles (574.3 km) |
| 2004 | 679,100,000 | 562,500,000 | 357.2 miles (574.9 km) |
| 2005 | 668,500,000 | 550,900,000 | 357.8 miles (575.8 km) |
| 2006 | 658,200,000 | 541,100,000 | 357.9 miles (575.9 km) |
| 2007 | 652,600,000 | 534,600,000 | 358.8 miles (577.5 km) |
| 2008 | 618,700,000 | 507,200,000 | 359.3 miles (578.2 km) |
| 2009 | 599,000,000 | 492,500,000 | 358.5 miles (577.0 km) |
| 2010 | 593,000,000 | 484,600,000 | 358.5 miles (577.0 km) |
| 2011 | 605,900,000 | 495,300,000 | 359.0 miles (577.7 km) |
| 2012 | 607,400,000 | 495,800,000 | 359.6 miles (578.7 km) |
| 2013 | 606,600,000 | 494,900,000 | 360.0 miles (579.4 km) |
| 2014 | 620,800,000 | 504,000,000 | 360.5 miles (580.2 km) |
| 2015 | 627,500,000 | 508,000,000 | 360.7 miles (580.5 km) |
| 2016 | 627,100,000 | 508,200,000 | 361.0 miles (580.9 km) |
| 2017 | 634,100,000 | 515,700,000 | 360.8 miles (580.7 km) |
| 2018 | 648,300,000 | 526,700,000 | 363.8 miles (585.5 km) |
| 2019 | 637,100,000 | 516,500,000 | 363.6 miles (585.2 km) |
| 2020 | 502,300,000 | 391,800,000 | 363.1 miles (584.4 km) |
| 2021 | 543,200,000 | 425,900,000 | 363.3 miles (584.6 km) |
| 2022 | 594,500,000 | 473,400,000 | 368.8 miles (593.5 km) |
| 2023 | 603,400,000 | 482,900,000 | 368.8 miles (593.5 km) |