Cardiff is a Welsh Unitary Authority.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 1,682,400,000 | 1,424,600,000 | 652.8 miles (1,050.6 km) |
| 2001 | 1,717,900,000 | 1,454,900,000 | 654.4 miles (1,053.2 km) |
| 2002 | 1,743,400,000 | 1,485,800,000 | 654.7 miles (1,053.6 km) |
| 2003 | 1,756,700,000 | 1,480,700,000 | 656.4 miles (1,056.3 km) |
| 2004 | 1,803,400,000 | 1,523,300,000 | 658.8 miles (1,060.2 km) |
| 2005 | 1,701,100,000 | 1,417,600,000 | 663.0 miles (1,067.0 km) |
| 2006 | 1,712,800,000 | 1,443,100,000 | 665.7 miles (1,071.4 km) |
| 2007 | 1,714,700,000 | 1,456,600,000 | 667.3 miles (1,073.9 km) |
| 2008 | 1,677,100,000 | 1,421,600,000 | 666.7 miles (1,073.0 km) |
| 2009 | 1,621,700,000 | 1,365,700,000 | 667.3 miles (1,073.9 km) |
| 2010 | 1,599,700,000 | 1,343,900,000 | 668.8 miles (1,076.3 km) |
| 2011 | 1,635,000,000 | 1,375,300,000 | 668.7 miles (1,076.1 km) |
| 2012 | 1,670,900,000 | 1,390,500,000 | 671.0 miles (1,079.8 km) |
| 2013 | 1,690,000,000 | 1,401,000,000 | 671.3 miles (1,080.4 km) |
| 2014 | 1,789,300,000 | 1,484,900,000 | 671.8 miles (1,081.1 km) |
| 2015 | 1,841,400,000 | 1,521,300,000 | 671.7 miles (1,081.0 km) |
| 2016 | 1,888,000,000 | 1,557,200,000 | 673.2 miles (1,083.4 km) |
| 2017 | 1,882,100,000 | 1,534,200,000 | 671.3 miles (1,080.3 km) |
| 2018 | 1,960,700,000 | 1,602,000,000 | 675.9 miles (1,087.7 km) |
| 2019 | 1,994,600,000 | 1,648,000,000 | 679.8 miles (1,094.0 km) |
| 2020 | 1,550,500,000 | 1,226,300,000 | 681.8 miles (1,097.2 km) |
| 2021 | 1,736,000,000 | 1,374,400,000 | 683.8 miles (1,100.4 km) |
| 2022 | 1,917,400,000 | 1,539,500,000 | 686.7 miles (1,105.2 km) |
| 2023 | 1,961,400,000 | 1,592,400,000 | 689.1 miles (1,109.1 km) |