
Total Traffic Volume & Performance in O'Brien County, Iowa
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day1,346 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 8.9% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 37.8 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. | 6.8% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 48.2 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $74,177 |
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The average monitored road in O'Brien County, Iowa carries 1,346 vehicles per day. Across its 302 miles of monitored roads, that adds up to 318,716 vehicle-miles traveled per day (≈116 million per year). About 1 in 11 vehicles is a truck, fewer than the 1 in 9 across Iowa.
Longer trips than 87% of counties in Iowa
O'Brien's average daily traffic volume is 56% lower than the state average - 1,346 vehicles per day against 3,042 - suggesting less traffic load per road - very light roads: easy truck access, but little passing trade for roadside retail. In total volume terms, its road network carries about 0.4% of Iowa's statewide total of vehicle-miles. By volume, O'Brien's 1,346 vehicles per day trails 72% of counties in Iowa.
Journey times run 15% higher than the state level, at 37.8 minutes on average. 87% of counties in Iowa have a shorter average travel time than O'Brien's 37.8 minutes.
Congestion runs 41% lower than the state level, at a ratio of 6.8%, which means smoother traffic flow - fewer delays make delivery windows more reliable.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in O'Brien County, Iowa
| Traffic | vehicles per day2,117 |
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| Trucks | 13.9% |
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| Average travel time | 53.1 min |
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| Congestion ratio | 4.8% |
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| Drivers’ average age | 47.8 yrs |
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| Drivers’ average income | $81,615 |
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Highways carry only a small share of the traffic in O'Brien County, Iowa, 12% of all vehicle-miles. The average highway carries 2,117 vehicles per day, 59% more than the average non-highway road in the same area, which carries 1,328 vehicles per day.
With 6% of the road miles (17 miles in 60 segments), highways punch above their length, carrying 36,998 vehicle-miles traveled per day (≈13.5 million per year).
The fewest highway trucks of any county in Iowa
At 13.9%, highway truck share is 14% lower than the state average. The highway traffic mix is typical for Iowa: neither freight- nor commuter-dominated.
By truck concentration, highways here trail 57% of counties in Iowa. At roughly 297 trucks per day, O'Brien carries the lowest volume of highway trucks in Iowa.

Non-highway Traffic in O'Brien County, Iowa
| Traffic | vehicles per day1,328 |
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| Trucks | 8.3% |
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| Average travel time | 37.5 min |
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| Congestion ratio | 6.8% |
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| Drivers’ average age | 48.2 yrs |
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| Drivers’ average income | $73,662 |
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The vast majority of driving in O'Brien County, Iowa happens on local roads: 88% of all vehicle-miles. A typical local road sees 1,328 vehicles per day.
Their share of road miles is similar, 94% (285 miles in 2,606 segments), carrying 281,718 vehicle-miles traveled per day (≈103 million per year). Trucks make up 8.3% of non-highway traffic, about 1 in 12 vehicles.
Younger drivers than 71% of counties in Iowa
Non-highway roads carry a truck concentration that's 40% lower than the highway network.
The non-highway congestion ratio of 6.8% is 39% lower than the state level, suggesting more efficient local mobility than the state average.
O'Brien's average driver income is higher than 57% of counties in Iowa. The driver population here skews younger than 71% of counties in Iowa.