Buckinghamshire is an English Unitary Authority. It was created in April 2020.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 3,829,800,000 | 3,201,100,000 | 2,017.0 miles (3,246.0 km) |
| 2001 | 3,825,300,000 | 3,195,300,000 | 2,020.5 miles (3,251.6 km) |
| 2002 | 3,828,000,000 | 3,195,000,000 | 2,023.9 miles (3,257.2 km) |
| 2003 | 3,796,400,000 | 3,144,300,000 | 2,027.6 miles (3,263.0 km) |
| 2004 | 3,724,700,000 | 3,084,200,000 | 1,964.7 miles (3,161.9 km) |
| 2005 | 3,677,500,000 | 3,028,900,000 | 1,973.5 miles (3,176.0 km) |
| 2006 | 3,745,400,000 | 3,059,200,000 | 1,996.7 miles (3,213.4 km) |
| 2007 | 3,790,800,000 | 3,085,200,000 | 2,002.9 miles (3,223.4 km) |
| 2008 | 3,755,300,000 | 3,083,900,000 | 2,001.9 miles (3,221.8 km) |
| 2009 | 3,664,600,000 | 3,010,400,000 | 2,013.1 miles (3,239.7 km) |
| 2010 | 3,670,300,000 | 2,982,500,000 | 2,015.0 miles (3,242.8 km) |
| 2011 | 3,608,800,000 | 2,949,600,000 | 2,019.2 miles (3,249.5 km) |
| 2012 | 3,689,300,000 | 3,007,500,000 | 2,025.4 miles (3,259.6 km) |
| 2013 | 3,722,200,000 | 3,038,700,000 | 2,030.2 miles (3,267.2 km) |
| 2014 | 3,849,500,000 | 3,126,500,000 | 2,037.1 miles (3,278.4 km) |
| 2015 | 3,957,200,000 | 3,177,700,000 | 2,043.1 miles (3,288.0 km) |
| 2016 | 4,102,200,000 | 3,282,400,000 | 2,049.7 miles (3,298.7 km) |
| 2017 | 4,117,700,000 | 3,310,000,000 | 2,052.1 miles (3,302.6 km) |
| 2018 | 4,063,900,000 | 3,253,800,000 | 2,052.9 miles (3,303.8 km) |
| 2019 | 4,067,400,000 | 3,250,000,000 | 2,064.0 miles (3,321.6 km) |
| 2020 | 3,202,700,000 | 2,450,200,000 | 2,069.0 miles (3,329.8 km) |
| 2021 | 3,532,700,000 | 2,682,400,000 | 2,077.7 miles (3,343.8 km) |
| 2022 | 3,939,500,000 | 3,033,800,000 | 2,085.7 miles (3,356.7 km) |
| 2023 | 4,022,100,000 | 3,121,700,000 | 2,091.4 miles (3,365.7 km) |