Blackburn with Darwen is an English Unitary Authority.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 419,700,000 | 351,100,000 | 348.1 miles (560.2 km) |
| 2001 | 415,100,000 | 346,800,000 | 349.0 miles (561.6 km) |
| 2002 | 423,300,000 | 352,800,000 | 349.6 miles (562.6 km) |
| 2003 | 423,300,000 | 347,900,000 | 350.5 miles (564.0 km) |
| 2004 | 432,400,000 | 353,700,000 | 349.8 miles (562.9 km) |
| 2005 | 437,300,000 | 358,000,000 | 352.3 miles (567.0 km) |
| 2006 | 430,700,000 | 351,500,000 | 341.3 miles (549.3 km) |
| 2007 | 445,000,000 | 365,800,000 | 340.8 miles (548.4 km) |
| 2008 | 434,200,000 | 355,400,000 | 340.2 miles (547.5 km) |
| 2009 | 423,600,000 | 348,500,000 | 339.7 miles (546.7 km) |
| 2010 | 423,700,000 | 346,800,000 | 341.5 miles (549.6 km) |
| 2011 | 426,600,000 | 349,600,000 | 340.8 miles (548.4 km) |
| 2012 | 424,800,000 | 347,100,000 | 341.2 miles (549.1 km) |
| 2013 | 432,000,000 | 352,800,000 | 341.4 miles (549.5 km) |
| 2014 | 446,000,000 | 362,900,000 | 341.3 miles (549.3 km) |
| 2015 | 450,300,000 | 366,500,000 | 341.6 miles (549.8 km) |
| 2016 | 449,300,000 | 365,100,000 | 341.9 miles (550.2 km) |
| 2017 | 431,200,000 | 350,500,000 | 342.2 miles (550.7 km) |
| 2018 | 451,600,000 | 369,100,000 | 344.3 miles (554.1 km) |
| 2019 | 456,800,000 | 373,600,000 | 344.5 miles (554.4 km) |
| 2020 | 354,400,000 | 280,700,000 | 346.0 miles (556.8 km) |
| 2021 | 396,900,000 | 314,200,000 | 347.0 miles (558.4 km) |
| 2022 | 418,400,000 | 332,000,000 | 327.4 miles (526.9 km) |
| 2023 | 433,200,000 | 348,200,000 | 329.7 miles (530.5 km) |