
Total Traffic Volume & Performance in Williamson County, Texas
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day8,688 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 7.7% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 31.3 min |
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Congestion ratio The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network. | 18.2% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 41.7 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $116,623 |
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A typical monitored road in Williamson County, Texas sees 8,688 vehicles per day, while its 1,411 miles of monitored roads together handle 14,018,154 vehicle-miles traveled per day (≈5.1 billion per year). About 1 in 13 vehicles is a truck, fewer than the 1 in 10 across Texas.
Busier roads than 96% of counties in Texas
Williamson's average daily traffic volume is 26% higher than the state average - 8,688 vehicles per day against 6,895 - suggesting more traffic load per road - a busier backdrop for retail sites, at the cost of slower access. Network-wide, Williamson accounts for about 1.9% of Texas's statewide total of vehicle-miles. By volume, Williamson's 8,688 vehicles per day outpaces 96% of counties in Texas.
At 31.3 minutes, the average travel time matches the state level closely. Its average travel time of 31.3 minutes is shorter than 84% of counties in Texas.
Congestion is somewhat higher than the state level, at a ratio of 18.2% (11% higher) - crucial for traffic control improvement and logistics planning.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Williamson County, Texas
| Traffic | vehicles per day22,512 |
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| Trucks | 11.2% |
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| Average travel time | 38.1 min |
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| Congestion ratio | 35.2% |
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| Drivers’ average age | 41.3 yrs |
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| Drivers’ average income | $108,265 |
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Travel in Williamson County, Texas splits roughly evenly, with about half of it (47% of vehicle-miles) on highways. The average highway carries 22,512 vehicles per day, 187% more than the average non-highway road in the same area, which carries 7,837 vehicles per day.
With 18% of the road miles (253 miles in 1,540 segments), highways punch above their length, carrying 6,603,966 vehicle-miles traveled per day (≈2.4 billion per year).
By highway travel volume, Williamson outranks 96% of counties in Texas.
More highway trucks than 85% of counties in Texas
Highway truck concentration here runs 18% lower than the state average, at 11.2%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.
Williamson's highway truck share (11.2%) is lower than 81% of counties in Texas. 85% of counties in Texas see fewer highway trucks per day than Williamson's roughly 2,524.

Non-highway Traffic in Williamson County, Texas
| Traffic | vehicles per day7,837 |
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| Trucks | 4.6% |
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| Average travel time | 30.9 min |
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| Congestion ratio | 17.2% |
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| Drivers’ average age | 41.9 yrs |
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| Drivers’ average income | $120,563 |
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Travel in Williamson County, Texas splits roughly evenly, with about half of it (53% of vehicle-miles) on local roads. On the average non-highway road, that comes to 7,837 vehicles per day.
Local roads make up 82% of the monitored road miles (1,158 miles in 25,027 segments) but carry less than their share of travel: 7,414,189 vehicle-miles traveled per day (≈2.7 billion per year). The truck share on non-highway roads is 4.6%.
Drivers from higher-income areas than 98% of counties in Texas
Non-highway roads carry a truck concentration that's 59% lower than the highway network.
Non-highway congestion (17.2%) runs slightly higher than the state level (7% higher).
Williamson's average driver income is higher than 98% of counties in Texas. Williamson's median driver age is lower than 83% of counties in Texas.