Caerphilly is a Welsh Unitary Authority.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 647,200,000 | 539,200,000 | 614.7 miles (989.2 km) |
| 2001 | 642,300,000 | 534,800,000 | 614.7 miles (989.2 km) |
| 2002 | 660,400,000 | 548,900,000 | 615.9 miles (991.2 km) |
| 2003 | 659,700,000 | 543,800,000 | 617.3 miles (993.4 km) |
| 2004 | 677,800,000 | 556,700,000 | 617.7 miles (994.1 km) |
| 2005 | 670,000,000 | 548,100,000 | 619.6 miles (997.1 km) |
| 2006 | 677,800,000 | 554,100,000 | 624.3 miles (1,004.7 km) |
| 2007 | 686,800,000 | 556,200,000 | 631.4 miles (1,016.1 km) |
| 2008 | 682,300,000 | 554,600,000 | 631.6 miles (1,016.5 km) |
| 2009 | 674,400,000 | 549,900,000 | 634.5 miles (1,021.1 km) |
| 2010 | 666,800,000 | 541,500,000 | 633.9 miles (1,020.1 km) |
| 2011 | 674,900,000 | 549,300,000 | 635.3 miles (1,022.4 km) |
| 2012 | 682,200,000 | 555,800,000 | 635.0 miles (1,022.0 km) |
| 2013 | 683,200,000 | 555,800,000 | 635.6 miles (1,022.9 km) |
| 2014 | 715,400,000 | 580,500,000 | 636.7 miles (1,024.7 km) |
| 2015 | 734,600,000 | 595,900,000 | 637.2 miles (1,025.5 km) |
| 2016 | 749,700,000 | 607,700,000 | 637.7 miles (1,026.2 km) |
| 2017 | 743,800,000 | 598,300,000 | 630.0 miles (1,013.9 km) |
| 2018 | 752,100,000 | 599,900,000 | 630.5 miles (1,014.7 km) |
| 2019 | 758,800,000 | 608,800,000 | 630.1 miles (1,014.0 km) |
| 2020 | 602,600,000 | 470,100,000 | 630.4 miles (1,014.5 km) |
| 2021 | 670,500,000 | 523,300,000 | 630.8 miles (1,015.2 km) |
| 2022 | 719,100,000 | 564,000,000 | 632.0 miles (1,017.1 km) |
| 2023 | 730,000,000 | 580,100,000 | 632.5 miles (1,017.9 km) |