Somerset is an English Unitary Authority. It was created in April 2023.
| Year | All Motor Vehicles | Cars and Taxis | Road Network Total Length |
|---|---|---|---|
| 2000 | 3,380,400,000 | 2,694,200,000 | 4,170.0 miles (6,711.0 km) |
| 2001 | 3,501,200,000 | 2,789,900,000 | 4,176.2 miles (6,720.9 km) |
| 2002 | 3,612,500,000 | 2,902,100,000 | 4,182.3 miles (6,730.8 km) |
| 2003 | 3,666,400,000 | 2,939,100,000 | 4,188.7 miles (6,741.1 km) |
| 2004 | 3,736,300,000 | 2,973,000,000 | 4,172.2 miles (6,714.5 km) |
| 2005 | 3,793,300,000 | 3,008,300,000 | 4,132.2 miles (6,650.2 km) |
| 2006 | 3,953,600,000 | 3,158,600,000 | 4,206.2 miles (6,769.2 km) |
| 2007 | 4,014,800,000 | 3,165,600,000 | 4,212.5 miles (6,779.4 km) |
| 2008 | 4,069,300,000 | 3,216,100,000 | 4,207.0 miles (6,770.6 km) |
| 2009 | 4,012,900,000 | 3,185,700,000 | 4,205.2 miles (6,767.6 km) |
| 2010 | 3,996,300,000 | 3,156,200,000 | 4,203.6 miles (6,765.1 km) |
| 2011 | 3,980,400,000 | 3,143,300,000 | 4,192.2 miles (6,746.7 km) |
| 2012 | 4,008,700,000 | 3,163,900,000 | 4,203.6 miles (6,765.1 km) |
| 2013 | 4,035,300,000 | 3,182,800,000 | 4,208.8 miles (6,773.3 km) |
| 2014 | 4,101,600,000 | 3,210,400,000 | 4,213.0 miles (6,780.2 km) |
| 2015 | 4,212,100,000 | 3,276,000,000 | 4,206.4 miles (6,769.6 km) |
| 2016 | 4,393,300,000 | 3,390,300,000 | 4,225.0 miles (6,799.5 km) |
| 2017 | 4,610,100,000 | 3,575,800,000 | 4,235.1 miles (6,815.8 km) |
| 2018 | 4,611,800,000 | 3,583,300,000 | 4,225.4 miles (6,800.1 km) |
| 2019 | 4,705,300,000 | 3,658,900,000 | 4,230.0 miles (6,807.6 km) |
| 2020 | 3,657,200,000 | 2,724,100,000 | 4,237.7 miles (6,820.0 km) |
| 2021 | 4,128,100,000 | 3,083,000,000 | 4,245.4 miles (6,832.3 km) |
| 2022 | 4,403,000,000 | 3,324,400,000 | 4,214.6 miles (6,782.8 km) |
| 2023 | 4,511,100,000 | 3,429,200,000 | 4,224.1 miles (6,798.0 km) |