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TrafficThe average number of vehicles that travel each day over any road in the road network. | vehicles per day4,995 |
|---|---|
TrucksThe percentage of the total traffic volume composed of heavy vehicles. | 14.9% |
Average travel timeThe average time of travel averaged among all vehicles traveling on the road network. | 29.5 min |
Congestion ratioThe rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network. | 13.3% |
Drivers’ average ageAverage age of residents in the geographic areas where the vehicle trips originated. | 47.4 yrs |
Drivers’ average incomeAverage income of residents in the geographic areas where the vehicle trips originated. | $79,371 |
A typical monitored road in St. Clair County, Alabama sees 4,995 vehicles per day, while its 461 miles of monitored roads together handle 2,968,588 vehicle-miles traveled per day (≈1.1 billion per year). At 14.9%, the truck share runs above the 10.6% across Alabama: about 1 in 7 vehicles.
St. Clair sees 16% lower average daily traffic volume than the state average (4,995 vehicles per day against 5,932), suggesting less demand on each road - a critical factor for logistics and site planning. In total volume terms, its road network carries about 2.1% of Alabama's statewide total of vehicle-miles. 67% of counties in Alabama see less traffic than St. Clair's 4,995 vehicles per day.
Journey times run 7% lower than the state level, at 29.5 minutes on average. On travel time, St. Clair runs shorter than 97% of counties in Alabama.
Congestion is somewhat lower than the state level, at a ratio of 13.3% (14% lower) - crucial for traffic control improvement and logistics planning.
| Traffic | vehicles per day18,227 |
|---|---|
| Trucks | 20.6% |
| Average travel time | 48.0 min |
| Congestion ratio | 23.8% |
| Drivers’ average age | 46.2 yrs |
| Drivers’ average income | $78,539 |
Highways carry more than half of all travel in St. Clair County, Alabama (59% of vehicle-miles). The average highway carries 18,227 vehicles per day, 283% more than the average non-highway road in the same area, which carries 4,753 vehicles per day.
With 22% of the road miles (103 miles in 113 segments), highways punch above their length, carrying 1,746,050 vehicle-miles traveled per day (≈637 million per year).
85% of counties in Alabama move less traffic on their highways.
The concentration of trucks on highways (20.6%) 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.
83% of counties in Alabama see a lower highway truck share than St. Clair's 20.6%. By raw truck volume, St. Clair carries more highway trucks than 98% of counties in Alabama.
| Traffic | vehicles per day4,753 |
|---|---|
| Trucks | 6.7% |
| Average travel time | 29.2 min |
| Congestion ratio | 13.1% |
| Drivers’ average age | 47.8 yrs |
| Drivers’ average income | $79,952 |
A significant share of driving in St. Clair County, Alabama, 41% of vehicle-miles, happens on local roads. A typical local road sees 4,753 vehicles per day.
Spread over 358 miles and 6,182 segments, 78% of the road network, local roads carry a lighter load per mile: 1,222,538 vehicle-miles traveled per day (≈446 million per year). About 1 in 15 vehicles on non-highway roads is a truck (6.7%).
Non-highway roads carry a truck concentration that's 67% lower than the highway network.
Non-highway congestion (13.1%) runs slightly lower than the state level (11% lower).
94% of counties in Alabama see lower average driver income among trip origins than St. Clair. 65% of counties in Alabama have an older driver population than St. Clair.
The truck share sets St. Clair County apart: 40% above the Alabama average. Its highway truck share is also 39% above.
| Metric | St. Clair County | Alabama average | Difference |
|---|---|---|---|
| Traffic | 4,995 | 5,932 | -15.8% |
| Truck % (Total Traffic) | 14.9% | 10.6% | +40.0% |
| Truck % (Highway) | 20.6% | 14.8% | +38.9% |
| Avg. Travel Time | 29.5 min | 31.8 min | -7.3% |
St. Clair County tracks the 4 areas around it closely - no measure in this table sets it far apart from the areas immediately next to it, though it has the fourth busiest roads of the five. Traffic volume here matches the areas around it, but more of that traffic is trucks - a difference in what routes through, not in how much.
| Area | Average daily traffic | Truck share | Daily vehicle-miles | Average travel time | Congestion ratio |
|---|---|---|---|---|---|
| St. Clair County | 4,995 | 14.9% | 2,968,588 | 29.5 min | 13.3% |
| Talladega County, Alabama | 4,184 | 14.7% | 2,440,527 | 35.8 min | 10.6% |
| Blount County, Alabama | 5,084 | 10.4% | 1,486,176 | 31.4 min | 12.2% |
| Calhoun County, Alabama | 5,541 | 11.0% | 2,988,924 | 31.9 min | 14.2% |
| Etowah County, Alabama | 6,122 | 10.5% | 2,556,645 | 36.4 min | 15.8% |
| Alabama average | 5,932 | 10.6% | N/A | 31.8 min | 15.5% |
St. Clair County sits in Alabama's top three on highway truck volume.
| Measure | St. Clair County | Alabama rank |
|---|---|---|
| Traffic volume (AADT) | 4,995 | #23 of 67 |
| Highway vehicle-miles per day | 1,746,050 | #10 of 60 |
| Truck share on highways | 20.6% | #11 of 60 |
| Highway trucks per day | 3,749 | #2 of 60 |
| Average travel time | 29.5 min | #65 of 67 |
| Average driver income | $79,371 | #5 of 67 |
| Average driver age | 47.4 yrs | #44 of 67 |
St. Clair County ranks #2 of 60 on highway truck volume but #65 of 67 on average travel time - the two describe the same roads and are worth reading together rather than either on its own.
The three busiest roads in St. Clair County average 32,438 vehicles a day, 6.5 times the county average of 4,995 across all its monitored roads.
I 20 is the busiest road, at 49,084 vehicles a day, 11,098 of them trucks (22.6%). No other road comes close: I 59, in second place, carries 25,031. It tops the truck ranking too, with the most trucks.
I 20 carries longer journeys than most roads here, with a median trip of 47.1 minutes against 29.5 county-wide.
Few trucks use Martin Street: 3.8% of its traffic, under half the county's 14.9%.
Freight stands out on I 20: trucks are 22.6% of the traffic there, against 14.9% county-wide.
At 9.8 times the county average, I 20 draws drivers from neighborhoods averaging $79,420 in household income.
Drivers on I 59 are on long journeys, a median 45.2 minutes against 29.5 county-wide: a through route more than a local street.
Delays build on Martin Street: its congestion ratio of 30% over free-flow time is well above the county's 13%.
Travel on Moody Parkway's busiest stretch runs 38% over free-flow time, against 13% across the county, so expect slower peak hours.
On its busiest stretch, Heart of Dixie Highway carries 4.1 times the county average; trucks are 4.9% of it, below the county-wide 14.9%.
The average monitored road in St. Clair carries 4,995 vehicles per day, 16% less than the Alabama average of 5,932.
St. Clair carries more traffic than 67% of counties in Alabama, averaging 4,995 vehicles per day.
Drivers on St. Clair roads have a median age of 47 years, and the median household income of the neighborhoods trips originate from averages $79,371, 11% above the Alabama average.
Approximately 54% of highway traffic and 15% of non-highway traffic consists of vehicles whose trip originates outside St. Clair County, Alabama. A sizeable share of highway traffic comes from outside, mixed with local trips on the same roads.
Trucks make up about 14.9% of all traffic in St. Clair County, Alabama, rising to 20.6% on highways, where long-haul freight concentrates.
I 20 carries the most, 49,084 vehicles per day on its busiest stretch, followed by I 59 (25,031), Martin Street (23,200), Moody Parkway (20,724), Heart of Dixie Highway (20,402). Figures are AADT, both directions combined.
I 20, with about 11,098 trucks per day on its busiest stretch, 22.6% of its 49,084 vehicles.
About 49,084 vehicles per day in both directions on its busiest stretch, including 11,098 trucks (22.6%). Traffic is lower on its quieter stretches; TrafficZoom shows the count for every segment.

Mobile device location data (anonymized and aggregated)

Road sensor networks and traffic counters

Historical traffic pattern databases
The same traffic breakdown for the areas closest to St. Clair County, Alabama.
Identify traffic patterns street by street and analyze the exact corridors that matter to your project.