Darlington is an English Unitary Authority.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 481,700,000 | 389,900,000 | 331.0 miles (532.7 km) |
| 2001 | 492,700,000 | 400,000,000 | 331.6 miles (533.7 km) |
| 2002 | 507,700,000 | 414,100,000 | 332.3 miles (534.7 km) |
| 2003 | 504,500,000 | 408,200,000 | 332.9 miles (535.8 km) |
| 2004 | 497,800,000 | 399,000,000 | 332.1 miles (534.4 km) |
| 2005 | 499,300,000 | 399,900,000 | 334.1 miles (537.7 km) |
| 2006 | 502,200,000 | 402,800,000 | 338.1 miles (544.1 km) |
| 2007 | 495,700,000 | 393,300,000 | 336.2 miles (541.1 km) |
| 2008 | 488,400,000 | 386,600,000 | 337.0 miles (542.4 km) |
| 2009 | 479,300,000 | 381,500,000 | 339.8 miles (546.9 km) |
| 2010 | 472,200,000 | 373,500,000 | 339.6 miles (546.5 km) |
| 2011 | 478,300,000 | 379,500,000 | 339.3 miles (546.1 km) |
| 2012 | 482,100,000 | 383,200,000 | 340.1 miles (547.3 km) |
| 2013 | 480,600,000 | 380,700,000 | 341.0 miles (548.8 km) |
| 2014 | 494,400,000 | 390,200,000 | 342.0 miles (550.4 km) |
| 2015 | 503,000,000 | 395,100,000 | 340.6 miles (548.2 km) |
| 2016 | 497,400,000 | 389,100,000 | 342.1 miles (550.5 km) |
| 2017 | 498,600,000 | 387,200,000 | 342.6 miles (551.3 km) |
| 2018 | 511,700,000 | 399,700,000 | 343.3 miles (552.5 km) |
| 2019 | 526,300,000 | 413,600,000 | 345.7 miles (556.3 km) |
| 2020 | 424,400,000 | 317,500,000 | 348.7 miles (561.2 km) |
| 2021 | 472,700,000 | 355,600,000 | 350.0 miles (563.2 km) |
| 2022 | 514,200,000 | 397,400,000 | 345.6 miles (556.2 km) |
| 2023 | 525,600,000 | 408,900,000 | 347.7 miles (559.5 km) |