Northumberland is an English Unitary Authority. It was created in April 2013.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 1,499,300,000 | 1,204,900,000 | 3,143.8 miles (5,059.5 km) |
| 2001 | 1,537,300,000 | 1,237,600,000 | 3,148.1 miles (5,066.3 km) |
| 2002 | 1,558,500,000 | 1,248,600,000 | 3,152.2 miles (5,072.9 km) |
| 2003 | 1,566,600,000 | 1,252,800,000 | 3,156.5 miles (5,080.0 km) |
| 2004 | 1,612,100,000 | 1,285,500,000 | 3,129.3 miles (5,036.1 km) |
| 2005 | 1,613,800,000 | 1,284,600,000 | 3,129.7 miles (5,036.7 km) |
| 2006 | 1,661,400,000 | 1,320,500,000 | 3,275.6 miles (5,271.5 km) |
| 2007 | 1,691,800,000 | 1,327,000,000 | 3,292.6 miles (5,299.0 km) |
| 2008 | 1,659,100,000 | 1,298,600,000 | 3,271.4 miles (5,264.8 km) |
| 2009 | 1,636,800,000 | 1,291,200,000 | 3,231.0 miles (5,199.8 km) |
| 2010 | 1,638,300,000 | 1,289,200,000 | 3,213.8 miles (5,172.1 km) |
| 2011 | 1,678,200,000 | 1,324,200,000 | 3,208.9 miles (5,164.2 km) |
| 2012 | 1,663,700,000 | 1,305,100,000 | 3,211.1 miles (5,167.7 km) |
| 2013 | 1,683,000,000 | 1,319,400,000 | 3,213.7 miles (5,171.9 km) |
| 2014 | 1,728,300,000 | 1,350,000,000 | 3,212.4 miles (5,169.9 km) |
| 2015 | 1,784,700,000 | 1,389,600,000 | 3,208.6 miles (5,163.8 km) |
| 2016 | 1,855,100,000 | 1,435,700,000 | 3,200.8 miles (5,151.1 km) |
| 2017 | 1,923,600,000 | 1,478,300,000 | 3,207.5 miles (5,162.0 km) |
| 2018 | 1,948,600,000 | 1,494,500,000 | 3,204.4 miles (5,157.0 km) |
| 2019 | 2,032,800,000 | 1,570,800,000 | 3,204.2 miles (5,156.6 km) |
| 2020 | 1,619,400,000 | 1,202,100,000 | 3,188.9 miles (5,132.0 km) |
| 2021 | 1,824,800,000 | 1,360,500,000 | 3,191.4 miles (5,136.1 km) |
| 2022 | 1,977,000,000 | 1,495,300,000 | 3,100.8 miles (4,990.2 km) |
| 2023 | 2,043,100,000 | 1,554,800,000 | 3,104.0 miles (4,995.4 km) |