
Total Traffic Volume & Performance in Polk County, Tennessee
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day2,652 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 9.4% |
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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. | 6.4% |
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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. | $65,039 |
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Our data shows 2,652 vehicles per day on the average road in Polk County, Tennessee, and 468,953 vehicle-miles traveled per day (≈171 million per year) across its 156 miles of monitored roads. Trucks are a smaller part of the mix than across Tennessee: 9.4% against 11.3%.
Quieter roads than 83% of counties in Tennessee
At 2,652 vehicles per day, the average monitored road in Polk carries 63% less traffic than the state average of 7,251, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. In total volume terms, its road network carries about 0.3% of Tennessee's statewide total of vehicle-miles. 83% of counties in Tennessee see more traffic than Polk's 2,652 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 longer than 64% of counties in Tennessee.
The congestion ratio of 6.4% is 60% lower, pointing to smoother traffic flow than the state level - delays are rare enough to plan travel times almost to the minute.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Polk County, Tennessee
| Traffic | vehicles per day4,890 |
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| Trucks | 9.6% |
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| Average travel time | 38.7 min |
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| Congestion ratio | 10.5% |
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| Drivers’ average age | 48.8 yrs |
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| Drivers’ average income | $65,414 |
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The vast majority of driving in Polk County, Tennessee happens on highways: 82% of all vehicle-miles. The average highway carries 4,890 vehicles per day, 316% more than the average non-highway road in the same area, which carries 1,175 vehicles per day.
With 55% of the road miles (85 miles in 608 segments), highways punch above their length, carrying 384,045 vehicle-miles traveled per day (≈140 million per year).
Lower highway truck share than 88% of counties in Tennessee
Highway truck concentration here runs 39% lower than the state average, at 9.6%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.
Polk's highway truck share (9.6%) is lower than 88% of counties in Tennessee. 86% of counties in Tennessee see more highway trucks per day than Polk's roughly 469.

Non-highway Traffic in Polk County, Tennessee
| Traffic | vehicles per day1,175 |
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| Trucks | 8.7% |
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| Average travel time | 29.7 min |
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| Congestion ratio | 3.7% |
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| Drivers’ average age | 52.2 yrs |
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| Drivers’ average income | $63,604 |
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At 18% of vehicle-miles, local roads carry a smaller share of the traffic in Polk County, Tennessee than highways. The average non-highway road carries 1,175 vehicles per day.
Local roads make up 45% of the monitored road miles (71 miles in 921 segments) but carry less than their share of travel: 84,908 vehicle-miles traveled per day (≈31.0 million per year). The truck share on non-highway roads is 8.7%.
Local congestion 76% below the Tennessee average
Compared to highways, non-highway routes see 9% fewer trucks by share.
At 76% lower than the state level, the non-highway congestion ratio of 3.7% signals easier movement on local roads.
Trip origins here have higher average income than 68% of counties in Tennessee. The driver population here skews older than 62% of counties in Tennessee.