- 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 Johnson County Road Miles Chart |
|---|
| Calendar Year | Number of All Vehicle Miles | Change from Prior Year | Number of Truck Miles | Change from Prior Year |
|---|
| 2005 | 328,706.561 | N/A | 9,514.889 | N/A |
| 2006 | 334,829.126 | 1.9% | 9,710.829 | 2.1% |
| 2007 | 334,133.426 | -0.2% | 10,692.268 | 10.1% |
| 2008 | 302,089.476 | -9.6% | 9,005.111 | -15.8% |
| 2009 | 379,866.350 | 25.7% | 11,447.441 | 27.1% |
| 2010 | 378,550.700 | -0.3% | 12,113.622 | 5.8% |
| 2011 | 376,852.920 | -0.4% | 12,059.293 | -0.4% |
| 2012 | 390,680.155 | 3.7% | 12,501.765 | 3.7% |
| 2013 | 390,331.730 | -0.1% | 12,490.615 | -0.1% |
| 2014 | 378,798.754 | -3.0% | 12,121.560 | -3.0% |
| 2015 | 380,928.083 | 0.6% | 12,189.699 | 0.6% |
| 2016 | 382,631.853 | 0.4% | 12,244.219 | 0.4% |
| 2017 | 382,532.983 | 0.0% | 11,722.710 | -4.3% |
| 2018 | 394,250.579 | 3.1% | 12,523.370 | 6.8% |
| 2019 | 386,636.108 | -1.9% | 13,032.789 | 4.1% |
| 2020 | 376,579.123 | -2.6% | 13,999.183 | 7.4% |
| 2021 | 362,711.591 | -3.7% | 12,378.333 | -11.6% |
| 2022 | 400,077.735 | 10.3% | 13,606.908 | 9.9% |