
Total Traffic Volume & Performance in Mason County, Washington
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day3,459 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 5.8% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 33.7 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. | 12.5% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 48.6 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $81,750 |
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A typical monitored road in Mason County, Washington sees 3,459 vehicles per day, while its 352 miles of monitored roads together handle 1,196,383 vehicle-miles traveled per day (≈437 million per year). Trucks are a smaller part of the mix than across Washington: 5.8% against 7.1%.
Traffic 53% below the Washington average
Mason's average daily traffic volume is 53% lower than the state average - 3,459 vehicles per day against 7,322 - suggesting less traffic load per road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 0.8% of Washington's statewide total. Mason carries less traffic than 55% of counties in Washington.
Journey times here (33.7 minutes on average) closely track the state level. Its average travel time of 33.7 minutes is shorter than 53% of counties in Washington.
The congestion ratio of 12.5% is 37% lower, pointing to smoother traffic flow than the state level - fewer delays make delivery windows more reliable.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Mason County, Washington
| Traffic | vehicles per day6,645 |
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| Trucks | 6.7% |
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| Average travel time | 34.1 min |
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| Congestion ratio | 16.1% |
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| Drivers’ average age | 47.5 yrs |
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| Drivers’ average income | $78,985 |
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Highways carry a significant share of travel in Mason County, Washington: 34% of all vehicle-miles. The average highway carries 6,645 vehicles per day, 111% more than the average non-highway road in the same area, which carries 3,147 vehicles per day.
With 14% of the road miles (49 miles in 534 segments), highways punch above their length, carrying 408,531 vehicle-miles traveled per day (≈149 million per year).
Lower highway truck share than 97% of counties in Washington
At 6.7%, highway truck share is 30% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.
By truck concentration, highways here trail 97% of counties in Washington. 72% of counties in Washington see more highway trucks per day than Mason's roughly 445.

Non-highway Traffic in Mason County, Washington
| Traffic | vehicles per day3,147 |
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| Trucks | 5.3% |
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| Average travel time | 33.6 min |
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| Congestion ratio | 12.1% |
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| Drivers’ average age | 48.9 yrs |
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| Drivers’ average income | $82,957 |
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Local roads carry more than half of all travel in Mason County, Washington (66% of vehicle-miles). The average non-highway road carries 3,147 vehicles per day.
Spread over 303 miles and 5,459 segments, 86% of the road network, local roads carry a lighter load per mile: 787,852 vehicle-miles traveled per day (≈288 million per year). Trucks make up 5.3% of non-highway traffic, about 1 in 19 vehicles.
Local congestion 38% below the Washington average
The concentration of trucks on non-highway roads is 20% lower than on highways.
The non-highway congestion ratio of 12.1% is 38% lower than the state level, suggesting more efficient local mobility than the state average.
Trip origins here have higher average income than 58% of counties in Washington. 61% of counties in Washington have a younger driver population than Mason.