
Total Traffic Volume & Performance in Adams County, Illinois
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day4,336 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 7.4% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 33.8 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. | 12.9% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 49.6 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $70,218 |
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The average monitored road in Adams County, Illinois carries 4,336 vehicles per day. Across its 432 miles of monitored roads, that adds up to 1,164,837 vehicle-miles traveled per day (≈425 million per year). Trucks are a smaller part of the mix than across Illinois: 7.4% against 10.2%.
Traffic 49% below the Illinois average
Adams sees 49% lower average daily traffic volume than the state average (4,336 vehicles per day against 8,480), suggesting less demand on each road - lighter roads for freight, but less passing trade for roadside retail. Across the whole network, that travel is about 0.5% of Illinois's statewide total. 74% of counties in Illinois see less traffic than Adams's 4,336 vehicles per day.
The average trip takes 33.8 minutes, on par with the state level. Its average travel time of 33.8 minutes is longer than 50% of counties in Illinois.
Congestion runs 37% lower than the state level, at a ratio of 12.9%, which means smoother traffic flow - fewer delays make delivery windows more reliable.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Adams County, Illinois
| Traffic | vehicles per day3,651 |
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| Trucks | 11.8% |
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| Average travel time | 34.9 min |
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| Congestion ratio | 9.1% |
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| Drivers’ average age | 50.1 yrs |
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| Drivers’ average income | $72,168 |
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Highways carry a smaller share of travel in Adams County, Illinois, 26% of vehicle-miles; most driving happens on local roads. The average highway carries 3,651 vehicles per day, 17% less than the average non-highway road in the same area, which carries 4,379 vehicles per day.
Highways make up 20% of the monitored road miles (87 miles, 233 segments), so they carry more than their share: 308,609 vehicle-miles traveled per day (≈113 million per year).
Fewer highway trucks than 94% of counties in Illinois
The concentration of trucks on highways (11.8%) is 32% lower than the state average for similar road classifications. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.
By truck concentration, highways here trail 86% of counties in Illinois. By raw truck volume, Adams carries fewer highway trucks than 94% of counties in Illinois.

Non-highway Traffic in Adams County, Illinois
| Traffic | vehicles per day4,379 |
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| Trucks | 5.8% |
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| Average travel time | 33.7 min |
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| Congestion ratio | 13.2% |
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| Drivers’ average age | 49.6 yrs |
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| Drivers’ average income | $69,794 |
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Local roads carry most of the traffic in Adams County, Illinois: 74% of all vehicle-miles. On the average non-highway road, that comes to 4,379 vehicles per day.
Their share of road miles is similar, 80% (345 miles in 3,680 segments), carrying 856,228 vehicle-miles traveled per day (≈313 million per year). The truck share on non-highway roads is 5.8%.
Local congestion 36% below the Illinois average
Non-highway roads carry a truck concentration that's 50% lower than the highway network.
At 36% lower than the state level, the non-highway congestion ratio of 13.2% signals easier movement on local roads.
55% of counties in Illinois see higher average driver income among trip origins than Adams. 55% of counties in Illinois have a younger driver population than Adams.