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* Certified Data provided for On-System Daily Vehicle Miles, Centerline Miles and Lane Miles are based on calendar year 2022, provided by TPP-Data Management. These mileage statistics are On-System only (under the jurisdiction of TxDOT).
| County | Value * |
|---|---|
| Brazoria | 498.852 |
| Fort Bend | 458.421 |
| Galveston | 328.884 |
| Harris | 1,378.870 |
| Montgomery | 537.299 |
| Waller | 237.889 |