
Total Traffic Volume & Performance in Tama County, Iowa
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day1,382 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 11.0% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 42.3 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. | 5.6% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 49.5 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $71,125 |
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A typical monitored road in Tama County, Iowa sees 1,382 vehicles per day, while its 318 miles of monitored roads together handle 485,325 vehicle-miles traveled per day (≈177 million per year). Trucks are 11.0% of traffic, close to the 11.0% across Iowa.
Longer trips than 98% of counties in Iowa
At 1,382 vehicles per day, the average monitored road in Tama carries 55% less traffic than the state average of 3,042, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Network-wide, Tama accounts for about 0.6% of Iowa's statewide total of vehicle-miles. 65% of counties in Iowa see more traffic than Tama's 1,382 vehicles per day.
The average trip takes 42.3 minutes, 28% higher than the state level. Its average travel time of 42.3 minutes is longer than 98% of counties in Iowa.
At 51% lower than the state level, the 5.6% congestion ratio signals smoother traffic flow - free-flowing roads make scheduled deliveries highly predictable.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Tama County, Iowa
| Traffic | vehicles per day3,825 |
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| Trucks | 13.3% |
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| Average travel time | 56.5 min |
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| Congestion ratio | 8.8% |
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| Drivers’ average age | 48.3 yrs |
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| Drivers’ average income | $69,963 |
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Highways carry a significant share of travel in Tama County, Iowa: 40% of all vehicle-miles. The average highway carries 3,825 vehicles per day, 206% more than the average non-highway road in the same area, which carries 1,249 vehicles per day.
With 16% of the road miles (50 miles in 157 segments), highways punch above their length, carrying 192,490 vehicle-miles traveled per day (≈70.3 million per year).
Fewer highway trucks than 72% of counties in Iowa
Highway truck concentration here runs 17% lower than the state average, at 13.3%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.
By truck concentration, highways here trail 67% of counties in Iowa. Tama's highway truck count is lower than 72% of counties in Iowa, at roughly 509 trucks per day.

Non-highway Traffic in Tama County, Iowa
| Traffic | vehicles per day1,249 |
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| Trucks | 9.5% |
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| Average travel time | 41.5 min |
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| Congestion ratio | 5.4% |
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| Drivers’ average age | 50.5 yrs |
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| Drivers’ average income | $71,674 |
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Local roads carry more than half of all travel in Tama County, Iowa (60% of vehicle-miles). A typical local road sees 1,249 vehicles per day.
Local roads make up 84% of the monitored road miles (268 miles in 2,885 segments) but carry less than their share of travel: 292,835 vehicle-miles traveled per day (≈107 million per year). The truck share on non-highway roads is 9.5%.
Local congestion 52% below the Iowa average
Compared to highways, non-highway routes see 28% fewer trucks by share.
Non-highway congestion (5.4%) runs 52% lower than the state average, pointing to smoother local traffic flow.
57% of counties in Iowa see higher average driver income among trip origins than Tama. The driver population here skews younger than 56% of counties in Iowa.