
Total Traffic Volume & Performance in Merrimack County, New Hampshire
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day5,275 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 7.6% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 33.3 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. | 16.9% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 48.3 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $102,246 |
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The average monitored road in Merrimack County, New Hampshire carries 5,275 vehicles per day. Across its 748 miles of monitored roads, that adds up to 5,263,011 vehicle-miles traveled per day (≈1.9 billion per year). Trucks are 7.6% of traffic, close to the 7.0% across New Hampshire.
Shorter trips than 67% of counties in New Hampshire
Merrimack's average daily traffic volume is 7% lower than the state average - 5,275 vehicles per day against 5,669. Across the whole network, that travel is about 16% of New Hampshire's statewide total. 56% of counties in New Hampshire see less traffic than Merrimack's 5,275 vehicles per day.
Journey times here (33.3 minutes on average) closely track the state level. Its average travel time of 33.3 minutes is shorter than 67% of counties in New Hampshire.
At 16.9%, the congestion ratio matches the state level closely.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Merrimack County, New Hampshire
| Traffic | vehicles per day12,228 |
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| Trucks | 9.0% |
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| Average travel time | 43.1 min |
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| Congestion ratio | 32.3% |
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| Drivers’ average age | 48.8 yrs |
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| Drivers’ average income | $102,780 |
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A little more than half of the driving in Merrimack County, New Hampshire happens on highways: 60% of all vehicle-miles. The average highway carries 12,228 vehicles per day, 168% more than the average non-highway road in the same area, which carries 4,563 vehicles per day.
Highways make up 26% of the monitored road miles (198 miles, 1,461 segments), so they carry more than their share: 3,146,640 vehicle-miles traveled per day (≈1.1 billion per year).
By highway travel volume, Merrimack outranks 78% of counties in New Hampshire.
More highway trucks than 78% of counties in New Hampshire
Highway truck concentration here (9.0%) closely tracks the state average for similar road classifications. The highway traffic mix is typical for New Hampshire: neither freight- nor commuter-dominated.
Merrimack's highway truck share (9.0%) is higher than 56% of counties in New Hampshire. By raw truck volume, Merrimack carries more highway trucks than 78% of counties in New Hampshire.

Non-highway Traffic in Merrimack County, New Hampshire
| Traffic | vehicles per day4,563 |
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| Trucks | 5.5% |
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| Average travel time | 32.3 min |
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| Congestion ratio | 15.3% |
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| Drivers’ average age | 48.0 yrs |
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| Drivers’ average income | $101,778 |
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A significant share of driving in Merrimack County, New Hampshire, 40% of vehicle-miles, happens on local roads. A typical local road sees 4,563 vehicles per day.
Spread over 550 miles and 14,278 segments, 74% of the road network, local roads carry a lighter load per mile: 2,116,372 vehicle-miles traveled per day (≈772 million per year). The truck share on non-highway roads is 5.5%.
Drivers from higher-income areas than 78% of counties in New Hampshire
Compared to highways, non-highway routes see 39% fewer trucks by share.
Non-highway congestion (15.3%) runs slightly lower than the state level (5% lower).
Merrimack's average driver income is higher than 78% of counties in New Hampshire. The driver population here skews younger than 78% of counties in New Hampshire.