
Total Traffic Volume & Performance in Rock County, Wisconsin
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day4,173 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 12.3% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 34.1 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. | 12.2% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 47.6 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $78,084 |
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A typical monitored road in Rock County, Wisconsin sees 4,173 vehicles per day, while its 748 miles of monitored roads together handle 3,531,638 vehicle-miles traveled per day (≈1.3 billion per year). At 12.3%, the truck share runs above the 10.2% across Wisconsin: about 1 in 8 vehicles.
Busier roads than 85% of counties in Wisconsin
At 4,173 vehicles per day, the average road in Rock carries somewhat more traffic than the state average of 3,802 (10% more). In total volume terms, its road network carries about 2.7% of Wisconsin's statewide total of vehicle-miles. By volume, Rock's 4,173 vehicles per day outpaces 85% of counties in Wisconsin.
Journey times run 6% higher than the state level, at 34.1 minutes on average. Its average travel time of 34.1 minutes is longer than 70% of counties in Wisconsin.
Congestion here (12.2%) closely tracks the state level.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Rock County, Wisconsin
| Traffic | vehicles per day12,130 |
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| Trucks | 20.0% |
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| Average travel time | 49.7 min |
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| Congestion ratio | 25.3% |
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| Drivers’ average age | 47.6 yrs |
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| Drivers’ average income | $83,731 |
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Highways carry a significant share of travel in Rock County, Wisconsin: 44% of all vehicle-miles. The average highway carries 12,130 vehicles per day, 212% more than the average non-highway road in the same area, which carries 3,886 vehicles per day.
Yet highways are only 15% of the road network, 109 miles in 415 segments, so each mile of them is 3.0 times as busy as the average road mile.
By highway travel volume, Rock outranks 84% of counties in Wisconsin.
Higher highway truck share than 93% of counties in Wisconsin
Highway truck concentration here runs 36% higher than the state average, at 20.0%. Highways here lean toward freight, so highway access is a real asset for logistics operators.
Rock's highway truck share (20.0%) is higher than 93% of counties in Wisconsin. Rock's highway truck count is higher than 88% of counties in Wisconsin, at roughly 2,426 trucks per day.

Non-highway Traffic in Rock County, Wisconsin
| Traffic | vehicles per day3,886 |
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| Trucks | 6.4% |
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| Average travel time | 33.6 min |
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| Congestion ratio | 11.7% |
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| Drivers’ average age | 47.6 yrs |
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| Drivers’ average income | $76,658 |
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A little more than half of the driving in Rock County, Wisconsin happens on local roads: 56% of all vehicle-miles. The average non-highway road carries 3,886 vehicles per day.
Spread over 639 miles and 11,503 segments, 85% of the road network, local roads carry a lighter load per mile: 1,991,077 vehicle-miles traveled per day (≈727 million per year). About 1 in 16 vehicles on non-highway roads is a truck (6.4%).
Younger drivers than 82% of counties in Wisconsin
The concentration of trucks on non-highway roads is 68% lower than on highways.
The non-highway congestion ratio of 11.7% is in line with the state level.
63% of counties in Wisconsin see lower average driver income among trip origins than Rock. The driver population here skews younger than 82% of counties in Wisconsin.