
Total Traffic Volume & Performance in Adams County, Washington
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day2,523 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 17.6% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 40.1 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. | 7.6% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 40.7 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $73,529 |
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Our data shows 2,523 vehicles per day on the average road in Adams County, Washington, and 1,620,370 vehicle-miles traveled per day (≈591 million per year) across its 485 miles of monitored roads. About 1 in 6 vehicles is a truck, well above the 7.1% across Washington - a freight-heavy mix.
Longer trips than 89% of counties in Washington
At 2,523 vehicles per day, the average monitored road in Adams carries 66% less traffic than the state average of 7,322, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 1.0% of Washington's statewide total. By volume, Adams's 2,523 vehicles per day trails 71% of counties in Washington.
At 40.1 minutes, the average travel time is 21% higher than the state level. On travel time, Adams runs longer than 89% of counties in Washington.
At 62% lower than the state level, the 7.6% congestion ratio signals smoother traffic flow - free-flowing roads make scheduled deliveries highly predictable.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Adams County, Washington
| Traffic | vehicles per day5,818 |
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| Trucks | 20.1% |
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| Average travel time | 78.3 min |
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| Congestion ratio | 12.5% |
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| Drivers’ average age | 42.4 yrs |
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| Drivers’ average income | $79,902 |
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Highways carry most of the traffic in Adams County, Washington: 73% of all vehicle-miles. The average highway carries 5,818 vehicles per day, 157% more than the average non-highway road in the same area, which carries 2,264 vehicles per day.
With 42% of the road miles (203 miles in 133 segments), highways punch above their length, carrying 1,186,510 vehicle-miles traveled per day (≈433 million per year).
By highway travel volume, Adams outranks 50% of counties in Washington.
The highest highway truck share of any county in Washington
The concentration of trucks on highways (20.1%) is 111% higher than the state average for similar road classifications. That marks Adams as a major freight corridor, where highway access is what logistics operators compete on.
By share, Adams has the highest highway truck concentration in Washington, at 20.1%. By raw truck volume, Adams carries fewer highway trucks than 53% of counties in Washington.

Non-highway Traffic in Adams County, Washington
| Traffic | vehicles per day2,264 |
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| Trucks | 10.8% |
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| Average travel time | 37.1 min |
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| Congestion ratio | 7.2% |
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| Drivers’ average age | 40.0 yrs |
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| Drivers’ average income | $67,310 |
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Local roads carry a smaller share of travel in Adams County, Washington, 27% of vehicle-miles; most driving happens on highways. The average non-highway road carries 2,264 vehicles per day.
Local roads make up 58% of the monitored road miles (282 miles in 1,694 segments) but carry less than their share of travel: 433,859 vehicle-miles traveled per day (≈158 million per year). Trucks make up 10.8% of non-highway traffic, about 1 in 9 vehicles.
Younger drivers than 97% of counties in Washington
Non-highway roads carry a truck concentration that's 46% lower than the highway network.
The non-highway congestion ratio of 7.2% is 63% lower than the state level, suggesting more efficient local mobility than the state average.
Trip origins here have lower average income than 61% of counties in Washington. 97% of counties in Washington have an older driver population than Adams.