
Total Traffic Volume & Performance in Linn County, Iowa
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day5,107 |
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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. | 34.6 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. | 14.5% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 45.6 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $89,106 |
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A typical monitored road in Linn County, Iowa sees 5,107 vehicles per day, while its 857 miles of monitored roads together handle 4,350,192 vehicle-miles traveled per day (≈1.6 billion per year). Trucks are a smaller part of the mix than across Iowa: 7.5% against 11.0%.
Busier roads than 98% of counties in Iowa
At 5,107 vehicles per day, the average monitored road in Linn carries 68% more traffic than the state average of 3,042, suggesting more demand on each road - prime passing trade for storefronts, with more competition for road space. Across the whole network, that travel is about 5.2% of Iowa's statewide total. Linn carries more traffic than 98% of counties in Iowa.
At 34.6 minutes, the average travel time matches the state level closely. Its average travel time of 34.6 minutes is longer than 64% of counties in Iowa.
Congestion runs 27% higher than the state level, at a ratio of 14.5%, which means more pronounced congestion - expect slower peak-hour deliveries and less predictable arrival times.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Linn County, Iowa
| Traffic | vehicles per day9,976 |
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| Trucks | 10.3% |
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| Average travel time | 36.7 min |
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| Congestion ratio | 18.0% |
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| Drivers’ average age | 45.3 yrs |
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| Drivers’ average income | $89,172 |
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Travel in Linn County, Iowa splits roughly evenly, with about half of it (46% of vehicle-miles) on highways. The average highway carries 9,976 vehicles per day, 104% more than the average non-highway road in the same area, which carries 4,878 vehicles per day.
Highways make up 25% of the monitored road miles (211 miles, 767 segments), so they carry more than their share: 2,010,341 vehicle-miles traveled per day (≈734 million per year).
No more than 2 other counties in Iowa move more traffic on their highways.
Lower highway truck share than 99% of counties in Iowa
The concentration of trucks on highways (10.3%) is 36% 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 99% of counties in Iowa. Linn's highway truck count is higher than 62% of counties in Iowa, at roughly 1,031 trucks per day.

Non-highway Traffic in Linn County, Iowa
| Traffic | vehicles per day4,878 |
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| Trucks | 5.0% |
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| Average travel time | 34.5 min |
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| Congestion ratio | 14.3% |
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| Drivers’ average age | 45.7 yrs |
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| Drivers’ average income | $89,056 |
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Travel in Linn County, Iowa splits roughly evenly, with about half of it (54% of vehicle-miles) on local roads. A typical local road sees 4,878 vehicles per day.
Local roads make up 75% of the monitored road miles (647 miles in 16,352 segments) but carry less than their share of travel: 2,339,852 vehicle-miles traveled per day (≈854 million per year). The truck share on non-highway roads is 5.0%.
Drivers from higher-income areas than 94% of counties in Iowa
The concentration of trucks on non-highway roads is 52% lower than on highways.
Non-highway congestion (14.3%) runs 29% higher than the state average, pointing to slower local traffic flow.
94% of counties in Iowa see lower average driver income among trip origins than Linn. The driver population here skews younger than 90% of counties in Iowa.