
Total Traffic Volume & Performance in Twin Falls County, Idaho
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day5,757 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 6.2% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 35.8 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. | 16.7% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 44.3 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $70,915 |
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The average monitored road in Twin Falls County, Idaho carries 5,757 vehicles per day. Across its 410 miles of monitored roads, that adds up to 1,688,761 vehicle-miles traveled per day (≈616 million per year). Trucks are a smaller part of the mix than across Idaho: 6.2% against 9.7%.
Busier roads than 86% of counties in Idaho
At 5,757 vehicles per day, the average road in Twin Falls tracks closely with the state average of 5,734 vehicles per day. In total volume terms, its road network carries about 3.7% of Idaho's statewide total of vehicle-miles. By volume, Twin Falls's 5,757 vehicles per day outpaces 86% of counties in Idaho.
The average trip takes 35.8 minutes, 6% higher than the state level. On travel time, Twin Falls runs longer than 74% of counties in Idaho.
Congestion here (16.7%) closely tracks the state level.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Twin Falls County, Idaho
| Traffic | vehicles per day8,138 |
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| Trucks | 10.6% |
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| Average travel time | 35.9 min |
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| Drivers’ average age | 44.5 yrs |
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| Drivers’ average income | $73,772 |
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At 20% of vehicle-miles, highways carry a smaller share of the traffic in Twin Falls County, Idaho than local roads. The average highway carries 8,138 vehicles per day, 44% more than the average non-highway road in the same area, which carries 5,647 vehicles per day.
With 13% of the road miles (52 miles in 287 segments), highways punch above their length, carrying 342,173 vehicle-miles traveled per day (≈125 million per year).
Passenger-oriented highways
Highway truck concentration here runs 25% lower than the state average, at 10.6%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.
53% of counties in Idaho see a higher highway truck share than Twin Falls's 10.6%. By raw truck volume, Twin Falls carries more highway trucks than 50% of counties in Idaho.

Non-highway Traffic in Twin Falls County, Idaho
| Traffic | vehicles per day5,647 |
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| Trucks | 5.1% |
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| Average travel time | 35.7 min |
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| Congestion ratio | 16.7% |
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| Drivers’ average age | 44.3 yrs |
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| Drivers’ average income | $70,492 |
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Most travel in Twin Falls County, Idaho happens on local roads, 80% of all vehicle-miles. On the average non-highway road, that comes to 5,647 vehicles per day.
Local roads also make up about 87% of the monitored road miles: 358 miles in 6,230 segments, together carrying 1,346,589 vehicle-miles traveled per day (≈492 million per year). The truck share on non-highway roads is 5.1%.
Local roads carry 52% fewer trucks by share than highways
The concentration of trucks on non-highway roads is 52% lower than on highways.
The non-highway congestion ratio of 16.7% is in line with the state level.
51% of counties in Idaho see lower average driver income among trip origins than Twin Falls. 60% of counties in Idaho have an older driver population than Twin Falls.