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* Certified Data provided for On-System Daily Vehicle Miles, Centerline Miles and Lane Miles are based on calendar year 2023, provided by TPP-Data Management. These mileage statistics are On-System only (under the jurisdiction of TxDOT).
| County | Value * |
|---|---|
| Brazoria | 6,175,616.640 |
| Fort Bend | 9,511,999.143 |
| Galveston | 5,585,093.156 |
| Harris | 69,420,211.479 |
| Montgomery | 12,945,656.951 |
| Waller | 2,382,736.747 |