
Total Traffic Volume & Performance in McHenry County, Illinois
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day9,188 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 6.8% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 34.3 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. | 24.0% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 47.7 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $110,532 |
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The average monitored road in McHenry County, Illinois carries 9,188 vehicles per day. Across its 628 miles of monitored roads, that adds up to 5,331,104 vehicle-miles traveled per day (≈1.9 billion per year). About 1 in 15 vehicles is a truck, fewer than the 1 in 10 across Illinois.
Busier roads than 95% of counties in Illinois
At 9,188 vehicles per day, the average road in McHenry carries somewhat more traffic than the state average of 8,480 (8% more). In total volume terms, its road network carries about 2.2% of Illinois's statewide total of vehicle-miles. 95% of counties in Illinois see less traffic than McHenry's 9,188 vehicles per day.
At 34.3 minutes, the average travel time matches the state level closely. 67% of counties in Illinois have a shorter average travel time than McHenry's 34.3 minutes.
At 16% higher than the state level, the 24.0% congestion ratio signals more pronounced congestion - relevant for traffic control and delivery planning.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in McHenry County, Illinois
| Traffic | vehicles per day19,609 |
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| Trucks | 20.0% |
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| Average travel time | 50.6 min |
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| Congestion ratio | 31.6% |
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| Drivers’ average age | 48.6 yrs |
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| Drivers’ average income | $96,448 |
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Only a small share of travel in McHenry County, Illinois happens on highways: 11% of vehicle-miles. The average highway carries 19,609 vehicles per day, 114% more than the average non-highway road in the same area, which carries 9,176 vehicles per day.
Highways make up 4% of the monitored road miles (24 miles, 17 segments), so they carry more than their share: 578,552 vehicle-miles traveled per day (≈211 million per year).
53% of counties in Illinois move less traffic on their highways.
The most highway trucks of any county in Illinois
At 20.0%, highway truck share is 15% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.
McHenry's highway truck share (20.0%) is lower than 52% of counties in Illinois. At roughly 4,909 trucks per day, McHenry carries the highest volume of highway trucks in Illinois.

Non-highway Traffic in McHenry County, Illinois
| Traffic | vehicles per day9,176 |
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| Trucks | 5.2% |
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| Average travel time | 34.3 min |
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| Congestion ratio | 24.0% |
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| Drivers’ average age | 47.7 yrs |
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| Drivers’ average income | $111,123 |
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Local roads carry the vast majority of travel in McHenry County, Illinois, 89% of all vehicle-miles. On the average non-highway road, that comes to 9,176 vehicles per day.
Their share of road miles is similar, 96% (604 miles in 14,589 segments), carrying 4,752,552 vehicle-miles traveled per day (≈1.7 billion per year). Trucks make up 5.2% of non-highway traffic, about 1 in 19 vehicles.
Drivers from higher-income areas than 95% of counties in Illinois
Compared to highways, non-highway routes see 74% fewer trucks by share.
The non-highway congestion ratio of 24.0% is 16% higher than the state level, suggesting slower local mobility than the state average.
95% of counties in Illinois see lower average driver income among trip origins than McHenry. 74% of counties in Illinois have an older driver population than McHenry.