Monmouthshire is a Welsh Unitary Authority.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 757,500,000 | 587,000,000 | 988.6 miles (1,591.0 km) |
| 2001 | 759,300,000 | 594,300,000 | 990.0 miles (1,593.2 km) |
| 2002 | 781,100,000 | 607,600,000 | 991.4 miles (1,595.5 km) |
| 2003 | 768,200,000 | 595,900,000 | 992.9 miles (1,597.8 km) |
| 2004 | 815,800,000 | 635,000,000 | 994.4 miles (1,600.3 km) |
| 2005 | 820,300,000 | 633,500,000 | 995.6 miles (1,602.3 km) |
| 2006 | 812,800,000 | 628,600,000 | 1,015.3 miles (1,633.9 km) |
| 2007 | 839,500,000 | 642,400,000 | 1,016.6 miles (1,636.1 km) |
| 2008 | 851,100,000 | 655,600,000 | 1,014.1 miles (1,632.0 km) |
| 2009 | 840,300,000 | 654,000,000 | 1,013.6 miles (1,631.2 km) |
| 2010 | 823,600,000 | 635,200,000 | 1,011.8 miles (1,628.4 km) |
| 2011 | 827,500,000 | 639,200,000 | 1,011.2 miles (1,627.4 km) |
| 2012 | 817,900,000 | 628,000,000 | 1,011.0 miles (1,627.0 km) |
| 2013 | 824,200,000 | 634,400,000 | 1,011.7 miles (1,628.1 km) |
| 2014 | 863,800,000 | 666,700,000 | 1,011.6 miles (1,628.0 km) |
| 2015 | 875,600,000 | 670,900,000 | 1,011.1 miles (1,627.3 km) |
| 2016 | 917,400,000 | 699,700,000 | 1,013.6 miles (1,631.2 km) |
| 2017 | 929,800,000 | 705,400,000 | 1,012.0 miles (1,628.7 km) |
| 2018 | 938,000,000 | 709,900,000 | 1,010.1 miles (1,625.6 km) |
| 2019 | 955,300,000 | 723,000,000 | 1,010.8 miles (1,626.7 km) |
| 2020 | 705,100,000 | 507,500,000 | 1,010.7 miles (1,626.5 km) |
| 2021 | 802,600,000 | 573,000,000 | 1,011.4 miles (1,627.6 km) |
| 2022 | 896,100,000 | 650,000,000 | 1,012.9 miles (1,630.1 km) |
| 2023 | 947,200,000 | 700,000,000 | 1,014.0 miles (1,631.9 km) |