
Total Traffic Volume & Performance in Salt Lake County, Utah
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day12,656 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 5.9% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 32.1 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. | 25.7% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 39.1 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $104,848 |
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A typical monitored road in Salt Lake County, Utah sees 12,656 vehicles per day, while its 1,503 miles of monitored roads together handle 25,179,994 vehicle-miles traveled per day (≈9.2 billion per year). Trucks are a smaller part of the mix than across Utah: 5.9% against 8.9%.
Busier roads than 93% of counties in Utah
Salt Lake sees 24% higher average daily traffic volume than the state average (12,656 vehicles per day against 10,198), suggesting more demand on each road - a factor worth weighing in site selection and logistics planning. In total volume terms, its road network carries about 29% of Utah's statewide total of vehicle-miles. Salt Lake carries more traffic than 93% of counties in Utah.
At 32.1 minutes, the average travel time matches the state level closely. Its average travel time of 32.1 minutes is shorter than 61% of counties in Utah.
The congestion ratio of 25.7% is 21% higher, pointing to more pronounced congestion than the state level - relevant for traffic control and delivery planning.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Salt Lake County, Utah
| Traffic | vehicles per day42,376 |
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| Trucks | 7.7% |
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| Average travel time | 37.2 min |
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| Congestion ratio | 54.0% |
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| Drivers’ average age | 39.1 yrs |
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| Drivers’ average income | $104,618 |
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Travel in Salt Lake County, Utah splits roughly evenly, with about half of it (49% of vehicle-miles) on highways. The average highway carries 42,376 vehicles per day, 256% more than the average non-highway road in the same area, which carries 11,891 vehicles per day.
With 20% of the road miles (303 miles in 1,252 segments), highways punch above their length, carrying 12,368,837 vehicle-miles traveled per day (≈4.5 billion per year).
By highway travel volume, Salt Lake ranks first in Utah.
Lower highway truck share than 96% of counties in Utah
At 7.7%, highway truck share is 37% lower than the state average. Trucks are a small share of a very large highway flow, so Salt Lake still moves heavy freight volumes alongside its passenger traffic.
Salt Lake's highway truck share (7.7%) is lower than 96% of counties in Utah. Salt Lake's highway truck count is higher than 92% of counties in Utah, at roughly 3,271 trucks per day.

Non-highway Traffic in Salt Lake County, Utah
| Traffic | vehicles per day11,891 |
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| Trucks | 4.1% |
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| Average travel time | 32.0 min |
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| Congestion ratio | 25.0% |
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| Drivers’ average age | 39.1 yrs |
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| Drivers’ average income | $105,029 |
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Travel in Salt Lake County, Utah splits roughly evenly, with about half of it (51% of vehicle-miles) on local roads. On the average non-highway road, that comes to 11,891 vehicles per day.
Spread over 1,201 miles and 48,636 segments, 80% of the road network, local roads carry a lighter load per mile: 12,811,157 vehicle-miles traveled per day (≈4.7 billion per year). Trucks make up 4.1% of non-highway traffic, about 1 in 24 vehicles.
Younger drivers than 93% of counties in Utah
The concentration of trucks on non-highway roads is 47% lower than on highways.
Non-highway congestion (25.0%) runs slightly higher than the state level (10% higher).
Trip origins here have higher average income than 86% of counties in Utah. Salt Lake's median driver age is lower than 93% of counties in Utah.