
Total Traffic Volume & Performance in Delaware County, Iowa
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day1,486 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 11.3% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 31.5 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. | 6.9% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 51.4 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $80,113 |
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The average monitored road in Delaware County, Iowa carries 1,486 vehicles per day. Across its 366 miles of monitored roads, that adds up to 611,003 vehicle-miles traveled per day (≈223 million per year). Trucks are 11.3% of traffic, close to the 11.0% across Iowa.
Shorter trips than 78% of counties in Iowa
At 1,486 vehicles per day, the average monitored road in Delaware carries 51% 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. Across the whole network, that travel is about 0.7% of Iowa's statewide total. 58% of counties in Iowa see more traffic than Delaware's 1,486 vehicles per day.
At 31.5 minutes, the average travel time matches the state level closely. Its average travel time of 31.5 minutes is shorter than 78% of counties in Iowa.
The congestion ratio of 6.9% is 39% lower, pointing to smoother traffic flow than the state level - travel times are easy to plan around for scheduled deliveries.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Delaware County, Iowa
| Traffic | vehicles per day4,893 |
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| Trucks | 14.1% |
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| Average travel time | 47.5 min |
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| Congestion ratio | 11.4% |
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| Drivers’ average age | 50.4 yrs |
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| Drivers’ average income | $82,820 |
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Highways carry about half of all travel in Delaware County, Iowa, 52% of vehicle-miles. The average highway carries 4,893 vehicles per day, 263% more than the average non-highway road in the same area, which carries 1,348 vehicles per day.
Highways make up 18% of the monitored road miles (64 miles, 113 segments), so they carry more than their share: 316,708 vehicle-miles traveled per day (≈116 million per year).
A typical mix of freight and passenger traffic
Highway truck concentration here runs 12% lower than the state average, at 14.1%. The highway traffic mix is typical for Iowa: neither freight- nor commuter-dominated.
Delaware's highway truck share (14.1%) is lower than 52% of counties in Iowa. By raw truck volume, Delaware carries fewer highway trucks than 54% of counties in Iowa.

Non-highway Traffic in Delaware County, Iowa
| Traffic | vehicles per day1,348 |
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| Trucks | 8.3% |
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| Average travel time | 30.9 min |
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| Congestion ratio | 6.8% |
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| Drivers’ average age | 51.9 yrs |
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| Drivers’ average income | $78,292 |
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Local roads carry about half of all travel in Delaware County, Iowa, 48% of vehicle-miles. On the average non-highway road, that comes to 1,348 vehicles per day.
Local roads make up 82% of the monitored road miles (301 miles in 2,797 segments) but carry less than their share of travel: 294,294 vehicle-miles traveled per day (≈107 million per year). Trucks make up 8.3% of non-highway traffic, about 1 in 12 vehicles.
Drivers from higher-income areas than 80% of counties in Iowa
Compared to highways, non-highway routes see 41% fewer trucks by share.
At 39% lower than the state level, the non-highway congestion ratio of 6.8% signals easier movement on local roads.
Delaware's average driver income is higher than 80% of counties in Iowa. 69% of counties in Iowa have a younger driver population than Delaware.