
Total Traffic Volume & Performance in Thurston County, Washington
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day6,611 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 7.5% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 30.2 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. | 20.5% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 44.2 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $93,089 |
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The average monitored road in Thurston County, Washington carries 6,611 vehicles per day. Across its 732 miles of monitored roads, that adds up to 6,678,193 vehicle-miles traveled per day (≈2.4 billion per year). About 1 in 13 vehicles is a truck, in line with Washington (7.1%).
Shorter trips than 89% of counties in Washington
At 6,611 vehicles per day, the average road in Thurston carries somewhat less traffic than the state average of 7,322 (10% less). Network-wide, Thurston accounts for about 4.3% of Washington's statewide total of vehicle-miles. 84% of counties in Washington see less traffic than Thurston's 6,611 vehicles per day.
The average trip takes 30.2 minutes, 9% lower than the state level. Its average travel time of 30.2 minutes is shorter than 89% of counties in Washington.
At 20.5%, the congestion ratio matches the state level closely.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Thurston County, Washington
| Traffic | vehicles per day32,310 |
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| Trucks | 10.6% |
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| Average travel time | 44.0 min |
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| Congestion ratio | 52.9% |
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| Drivers’ average age | 44.7 yrs |
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| Drivers’ average income | $87,840 |
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Highways carry about half of all travel in Thurston County, Washington, 49% of vehicle-miles. The average highway carries 32,310 vehicles per day, 412% more than the average non-highway road in the same area, which carries 6,306 vehicles per day.
Yet highways are only 14% of the road network, 106 miles in 246 segments, so each mile of them is 3.4 times as busy as the average road mile.
That is more highway travel volume than 84% of counties in Washington.
More highway trucks than 94% of counties in Washington
Highway truck concentration here runs 12% higher than the state average, at 10.6%. The highway traffic mix is typical for Washington: neither freight- nor commuter-dominated.
By truck concentration, highways here outrank 56% of counties in Washington. 94% of counties in Washington see fewer highway trucks per day than Thurston's roughly 3,435.

Non-highway Traffic in Thurston County, Washington
| Traffic | vehicles per day6,306 |
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| Trucks | 4.5% |
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| Average travel time | 30.0 min |
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| Congestion ratio | 20.1% |
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| Drivers’ average age | 44.1 yrs |
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| Drivers’ average income | $96,532 |
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Local roads carry about half of all travel in Thurston County, Washington, 51% of vehicle-miles. On the average non-highway road, that comes to 6,306 vehicles per day.
Spread over 627 miles and 20,772 segments, 86% of the road network, local roads carry a lighter load per mile: 3,418,502 vehicle-miles traveled per day (≈1.2 billion per year). The truck share on non-highway roads is 4.5%.
Drivers from higher-income areas than 84% of counties in Washington
Compared to highways, non-highway routes see 57% fewer trucks by share.
At 20.1%, the non-highway congestion ratio matches the state level closely.
84% of counties in Washington see lower average driver income among trip origins than Thurston. 74% of counties in Washington have an older driver population than Thurston.