
Total Traffic Volume & Performance in Mercer County, Ohio
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day3,270 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 10.2% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 33.4 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. | 9.3% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 49.1 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $80,887 |
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The average monitored road in Mercer County, Ohio carries 3,270 vehicles per day. Across its 283 miles of monitored roads, that adds up to 803,661 vehicle-miles traveled per day (≈293 million per year). About 1 in 10 vehicles is a truck, in line with Ohio (9.9%).
Congestion 43% below the Ohio average
Mercer's average daily traffic volume is 43% lower than the state average - 3,270 vehicles per day against 5,773 - suggesting less traffic load per road - less drive-by exposure for retail, but easier access for deliveries. Across the whole network, that travel is about 0.3% of Ohio's statewide total. Mercer carries less traffic than 51% of counties in Ohio.
Journey times here (33.4 minutes on average) closely track the state level. Its average travel time of 33.4 minutes is longer than 51% of counties in Ohio.
At 43% lower than the state level, the 9.3% congestion ratio signals smoother traffic flow - travel times are easy to plan around for scheduled deliveries.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Mercer County, Ohio
| Traffic | vehicles per day6,295 |
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| Trucks | 11.9% |
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| Average travel time | 34.8 min |
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| Congestion ratio | 15.9% |
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| Drivers’ average age | 49.1 yrs |
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| Drivers’ average income | $78,241 |
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Highways carry a significant share of travel in Mercer County, Ohio: 36% of all vehicle-miles. The average highway carries 6,295 vehicles per day, 130% more than the average non-highway road in the same area, which carries 2,740 vehicles per day.
With 18% of the road miles (51 miles in 492 segments), highways punch above their length, carrying 289,222 vehicle-miles traveled per day (≈106 million per year).
Fewer highway trucks than 84% of counties in Ohio
The concentration of trucks on highways (11.9%) is 20% lower than the state average for similar road classifications. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.
73% of counties in Ohio see a higher highway truck share than Mercer's 11.9%. 84% of counties in Ohio see more highway trucks per day than Mercer's roughly 750.

Non-highway Traffic in Mercer County, Ohio
| Traffic | vehicles per day2,740 |
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| Trucks | 9.2% |
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| Average travel time | 33.2 min |
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| Congestion ratio | 8.1% |
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| Drivers’ average age | 49.0 yrs |
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| Drivers’ average income | $82,514 |
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A little more than half of the driving in Mercer County, Ohio happens on local roads: 64% of all vehicle-miles. The average non-highway road carries 2,740 vehicles per day.
Spread over 232 miles and 2,805 segments, 82% of the road network, local roads carry a lighter load per mile: 514,440 vehicle-miles traveled per day (≈188 million per year). Trucks make up 9.2% of non-highway traffic, about 1 in 11 vehicles.
Drivers from higher-income areas than 76% of counties in Ohio
Non-highway roads carry a truck concentration that's 23% lower than the highway network.
Non-highway congestion (8.1%) runs 49% lower than the state average, pointing to smoother local traffic flow.
Mercer's average driver income is higher than 76% of counties in Ohio. The driver population here skews younger than 52% of counties in Ohio.