
Total Traffic Volume & Performance in Custer County, South Dakota
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day2,656 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 8.3% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 27.2 min |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 55.9 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $78,594 |
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The average monitored road in Custer County, South Dakota carries 2,656 vehicles per day. Across its 247 miles of monitored roads, that adds up to 380,827 vehicle-miles traveled per day (≈139 million per year). About 1 in 12 vehicles is a truck, fewer than the 1 in 10 across South Dakota.
Shorter trips than 98% of counties in South Dakota
At 2,656 vehicles per day, the average monitored road in Custer carries 16% less traffic than the state average of 3,156, suggesting less demand on each road - a factor worth weighing in site selection and logistics planning. In total volume terms, its road network carries about 1.6% of South Dakota's statewide total of vehicle-miles. 83% of counties in South Dakota see less traffic than Custer's 2,656 vehicles per day.
The average trip takes 27.2 minutes, 16% lower than the state level. Its average travel time of 27.2 minutes is shorter than 98% of counties in South Dakota.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Custer County, South Dakota
| Traffic | vehicles per day6,794 |
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| Trucks | 9.7% |
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| Average travel time | 30.7 min |
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| Drivers’ average age | 54.1 yrs |
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| Drivers’ average income | $77,055 |
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Highways carry about half of all travel in Custer County, South Dakota, 48% of vehicle-miles. The average highway carries 6,794 vehicles per day, 231% more than the average non-highway road in the same area, which carries 2,051 vehicles per day.
Highways make up 26% of the monitored road miles (63 miles, 157 segments), so they carry more than their share: 184,583 vehicle-miles traveled per day (≈67.4 million per year).
By highway travel volume, Custer outranks 58% of counties in South Dakota.
Lower highway truck share than 96% of counties in South Dakota
At 9.7%, highway truck share is 29% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.
96% of counties in South Dakota see a higher highway truck share than Custer's 9.7%. By raw truck volume, Custer carries fewer highway trucks than 58% of counties in South Dakota.

Non-highway Traffic in Custer County, South Dakota
| Traffic | vehicles per day2,051 |
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| Trucks | 7.1% |
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| Average travel time | 26.7 min |
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| Drivers’ average age | 57.6 yrs |
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| Drivers’ average income | $79,990 |
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Local roads carry about half of all travel in Custer County, South Dakota, 52% of vehicle-miles. The average non-highway road carries 2,051 vehicles per day.
Spread over 184 miles and 1,075 segments, 74% of the road network, local roads carry a lighter load per mile: 196,244 vehicle-miles traveled per day (≈71.6 million per year). About 1 in 14 vehicles on non-highway roads is a truck (7.1%).
Older drivers than 94% of counties in South Dakota
Non-highway roads carry a truck concentration that's 27% lower than the highway network.
86% of counties in South Dakota see lower average driver income among trip origins than Custer. The driver population here skews older than 94% of counties in South Dakota.