
Total Traffic Volume & Performance in Mercer County, New Jersey
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day7,849 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 9.6% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 35.4 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. | 23.1% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 47.5 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $129,224 |
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Our data shows 7,849 vehicles per day on the average road in Mercer County, New Jersey, and 5,871,435 vehicle-miles traveled per day (≈2.1 billion per year) across its 622 miles of monitored roads. At 9.6%, the truck share runs above the 7.9% across New Jersey: about 1 in 10 vehicles.
Longer trips than 90% of counties in New Jersey
At 7,849 vehicles per day, the average road in Mercer carries somewhat less traffic than the state average of 8,886 (12% less) - a critical factor for logistics and site planning. Across the whole network, that travel is about 3.8% of New Jersey's statewide total. By volume, Mercer's 7,849 vehicles per day trails 55% of counties in New Jersey.
Journey times run 6% higher than the state level, at 35.4 minutes on average. Its average travel time of 35.4 minutes is longer than 90% of counties in New Jersey.
Congestion is somewhat lower than the state level, at a ratio of 23.1% (15% lower) - crucial for traffic control improvement and logistics planning.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Mercer County, New Jersey
| Traffic | vehicles per day16,962 |
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| Trucks | 14.2% |
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| Average travel time | 40.5 min |
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| Congestion ratio | 31.0% |
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| Drivers’ average age | 47.6 yrs |
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| Drivers’ average income | $133,483 |
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Travel in Mercer County, New Jersey splits roughly evenly, with about half of it (53% of vehicle-miles) on highways. The average highway carries 16,962 vehicles per day, 136% more than the average non-highway road in the same area, which carries 7,181 vehicles per day.
Highways make up 27% of the monitored road miles (171 miles, 1,232 segments), so they carry more than their share: 3,138,710 vehicle-miles traveled per day (≈1.1 billion per year).
Higher highway truck share than 85% of counties in New Jersey
The concentration of trucks on highways (14.2%) is 39% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.
Mercer's highway truck share (14.2%) is higher than 85% of counties in New Jersey. 60% of counties in New Jersey see fewer highway trucks per day than Mercer's roughly 2,415.

Non-highway Traffic in Mercer County, New Jersey
| Traffic | vehicles per day7,181 |
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| Trucks | 4.2% |
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| Average travel time | 35.0 min |
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| Congestion ratio | 22.5% |
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| Drivers’ average age | 47.3 yrs |
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| Drivers’ average income | $126,901 |
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Travel in Mercer County, New Jersey splits roughly evenly, with about half of it (47% of vehicle-miles) on local roads. The average non-highway road carries 7,181 vehicles per day.
Spread over 452 miles and 16,804 segments, 73% of the road network, local roads carry a lighter load per mile: 2,732,725 vehicle-miles traveled per day (≈997 million per year). About 1 in 24 vehicles on non-highway roads is a truck (4.2%).
Local roads carry 71% fewer trucks by share than highways
Non-highway roads carry a truck concentration that's 71% lower than the highway network.
Non-highway congestion (22.5%) runs slightly lower than the state level (8% lower).
Trip origins here have higher average income than 65% of counties in New Jersey. Mercer's median driver age is lower than 60% of counties in New Jersey.