- Data only includes miles travelled on county roads. It does not include miles travelled on city, state or federal roads and highways.
- Lack of a visible bar can occur when the number is so small the result is a bar less than one pixel in height.
| Data for the Harris County Road Miles Chart |
|---|
| Calendar Year | Number of All Vehicle Miles | Change from Prior Year | Number of Truck Miles | Change from Prior Year |
|---|
| 2005 | 10,417,336.793 | N/A | 264,695.384 | N/A |
| 2006 | 10,417,336.793 | 0.0% | 264,695.384 | 0.0% |
| 2007 | 12,397,676.412 | 19.0% | 316,653.395 | 19.6% |
| 2008 | 9,689,594.718 | -21.8% | 252,317.978 | -20.3% |
| 2009 | 9,672,259.473 | -0.2% | 251,760.537 | -0.2% |
| 2010 | 11,901,891.528 | 23.1% | 380,860.529 | 51.3% |
| 2011 | 12,736,823.855 | 7.0% | 403,677.901 | 6.0% |
| 2012 | 12,727,367.793 | -0.1% | 403,348.224 | -0.1% |
| 2013 | 12,556,588.252 | -1.3% | 401,810.824 | -0.4% |
| 2014 | 9,449,293.330 | -24.7% | 302,008.991 | -24.8% |
| 2015 | 10,358,214.503 | 9.6% | 334,731.249 | 10.8% |
| 2016 | 14,281,719.674 | 37.9% | 464,859.988 | 38.9% |
| 2017 | 14,387,400.728 | 0.7% | 469,039.176 | 0.9% |
| 2018 | 15,485,417.032 | 7.6% | 594,016.033 | 26.6% |
| 2019 | 15,855,661.265 | 2.4% | 618,606.134 | 4.1% |
| 2020 | 15,974,662.240 | 0.8% | 620,044.539 | 0.2% |
| 2021 | 14,876,208.160 | -6.9% | 592,900.620 | -4.4% |
| 2022 | 15,604,883.759 | 4.9% | 609,361.637 | 2.8% |