Harrow is an English London Borough.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 395,500,000 | 340,900,000 | 291.5 miles (469.1 km) |
| 2001 | 401,800,000 | 345,600,000 | 292.3 miles (470.4 km) |
| 2002 | 423,500,000 | 365,800,000 | 293.1 miles (471.7 km) |
| 2003 | 421,100,000 | 358,700,000 | 293.9 miles (472.9 km) |
| 2004 | 418,700,000 | 356,300,000 | 292.5 miles (470.8 km) |
| 2005 | 418,700,000 | 354,900,000 | 294.5 miles (473.9 km) |
| 2006 | 420,700,000 | 354,200,000 | 296.7 miles (477.5 km) |
| 2007 | 420,600,000 | 351,000,000 | 297.0 miles (478.0 km) |
| 2008 | 419,100,000 | 351,100,000 | 297.1 miles (478.2 km) |
| 2009 | 411,600,000 | 345,800,000 | 296.8 miles (477.6 km) |
| 2010 | 399,600,000 | 334,500,000 | 296.3 miles (476.9 km) |
| 2011 | 402,500,000 | 338,400,000 | 295.8 miles (476.0 km) |
| 2012 | 407,900,000 | 342,900,000 | 295.9 miles (476.2 km) |
| 2013 | 402,100,000 | 338,200,000 | 296.2 miles (476.7 km) |
| 2014 | 405,700,000 | 339,700,000 | 295.8 miles (476.0 km) |
| 2015 | 403,000,000 | 336,900,000 | 294.2 miles (473.4 km) |
| 2016 | 410,400,000 | 335,600,000 | 294.4 miles (473.9 km) |
| 2017 | 406,300,000 | 332,600,000 | 294.6 miles (474.1 km) |
| 2018 | 399,700,000 | 328,700,000 | 295.9 miles (476.2 km) |
| 2019 | 411,100,000 | 339,200,000 | 295.9 miles (476.2 km) |
| 2020 | 323,400,000 | 261,500,000 | 295.7 miles (475.8 km) |
| 2021 | 375,400,000 | 306,300,000 | 294.7 miles (474.3 km) |
| 2022 | 389,100,000 | 317,300,000 | 293.5 miles (472.3 km) |
| 2023 | 394,200,000 | 321,800,000 | 293.6 miles (472.5 km) |