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Traffic heat map of Calhoun County, South Carolina: 312 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 26 and Saint Matthews Road

Calhoun County, South Carolina Traffic Counts

How busy are the roads of Calhoun County, South Carolina? We measure 312 road miles, divided into 2,845 segments, with multi-sourced, cross-verified mobile and sensor data. Its highways rank among the top 3 counties in South Carolina for trucks per day. The breakdown below covers volume, trucks, congestion and driver profiles for retailers, logistics planners and engineers.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
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Total Traffic Volume & Performance in Calhoun County, South Carolina

Traffic

The average number of vehicles that travel each day over any road in the road network.

vehicles per day1,887
Trucks

The percentage of the total traffic volume composed of heavy vehicles.

16.4%
Average travel time

The average time of travel averaged among all vehicles traveling on the road network.

33.1 min
Congestion ratio

The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.

7.1%
Drivers’ average age

Average age of residents in the geographic areas where the vehicle trips originated.

44.8 yrs
Drivers’ average income

Average income of residents in the geographic areas where the vehicle trips originated.

$66,384

Our data shows 1,887 vehicles per day on the average road in Calhoun County, South Carolina, and 1,706,516 vehicle-miles traveled per day (≈623 million per year) across its 312 miles of monitored roads. About 1 in 6 vehicles is a truck, well above the 9.5% across South Carolina - a freight-heavy mix.

Quieter roads than 96% of counties in South Carolina

Calhoun's average daily traffic volume is 73% lower than the state average - 1,887 vehicles per day against 7,040 - suggesting less traffic load per road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 1.2% of South Carolina's statewide total. Calhoun carries less traffic than 96% of counties in South Carolina.

The average trip takes 33.1 minutes, on par with the state level. Its average travel time of 33.1 minutes is shorter than 64% of counties in South Carolina.

At 61% lower than the state level, the 7.1% congestion ratio signals smoother traffic flow - delays are rare enough to plan travel times almost to the minute.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Calhoun County, South Carolina

Trafficvehicles per day26,180
Trucks18.8%
Average travel time63.1 min
Congestion ratio53.8%
Drivers’ average age43.6 yrs
Drivers’ average income$69,725

Highways carry most of the traffic in Calhoun County, South Carolina: 78% of all vehicle-miles. The average highway carries 26,180 vehicles per day, 1482% more than the average non-highway road in the same area, which carries 1,654 vehicles per day.

That comes from just 16% of the monitored road miles: 50 miles in 27 segments, carrying 1,323,797 vehicle-miles traveled per day (≈483 million per year).

By highway travel volume, Calhoun outranks 57% of counties in South Carolina.

More highway trucks than 95% of counties in South Carolina

At 18.8%, highway truck share is 38% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

Calhoun's highway truck share (18.8%) is higher than 79% of counties in South Carolina. 95% of counties in South Carolina see fewer highway trucks per day than Calhoun's roughly 4,932.

non-highway traffic icon

Non-highway Traffic in Calhoun County, South Carolina

Trafficvehicles per day1,654
Trucks8.0%
Average travel time32.9 min
Congestion ratio6.7%
Drivers’ average age51.8 yrs
Drivers’ average income$59,134

At 22% of vehicle-miles, local roads carry a smaller share of the traffic in Calhoun County, South Carolina than highways. A typical local road sees 1,654 vehicles per day.

Spread over 262 miles and 2,818 segments, 84% of the road network, local roads carry a lighter load per mile: 382,719 vehicle-miles traveled per day (≈140 million per year). The truck share on non-highway roads is 8.0%.

Younger drivers than 89% of counties in South Carolina

Non-highway roads carry a truck concentration that's 57% lower than the highway network.

At 60% lower than the state level, the non-highway congestion ratio of 6.7% signals easier movement on local roads.

Trip origins here have higher average income than 60% of counties in South Carolina. The driver population here skews younger than 89% of counties in South Carolina.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Calhoun County, South Carolina, the peak hour concentrates about 7% of the day's traffic.

Calhoun County vs. South Carolina Traffic Comparison

The average daily traffic per road sets Calhoun County apart: 73% below the South Carolina average. Its truck share, by contrast, is 73% above.

MetricCalhoun CountySouth Carolina averageDifference
Traffic1,8877,040-73.2%
Truck % (Total Traffic)16.4%9.5%+72.7%
Truck % (Highway)18.8%13.7%+37.6%
Avg. Travel Time33.1 min33.3 min-0.4%

How Calhoun County compares

Calhoun County has the quietest roads among its nearby counties

Set against the average of the 4 areas nearest to it, Calhoun County carries 65.8% less traffic on a typical road and is 47.6% less congested; it has the quietest roads of the five. Less traffic and more room for it - the roads here run both quieter and freer than the areas around them.

Calhoun County and the 4 nearest county-level areas by centroid distance, with the South Carolina average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Calhoun County1,88716.4%1,706,51633.1 min7.1%
Orangeburg County, South Carolina3,82615.0%3,730,40336.1 min9.0%
Richland County, South Carolina9,6868.4%10,314,23032.7 min20.6%
Sumter County, South Carolina5,43210.0%2,622,82233.8 min15.6%
Clarendon County, South Carolina3,15518.3%1,778,90432.5 min9.2%
South Carolina average7,0409.5%N/A33.3 min18.2%

Calhoun County ranked within South Carolina

Calhoun County sits in South Carolina's top three on highway truck volume.

Calhoun County ranked among 46 county-level areas in South Carolina (1 = highest); measures without data in every county rank a smaller field, down to 43.
MeasureCalhoun CountySouth Carolina rank
Traffic volume (AADT)1,887#44 of 46
Highway vehicle-miles per day1,323,797#19 of 43
Truck share on highways18.8%#10 of 43
Highway trucks per day4,932#3 of 43
Average travel time33.1 min#30 of 46
Average driver income$66,384#19 of 46
Average driver age44.8 yrs#41 of 46

Calhoun County ranks #3 of 43 on highway truck volume but #44 of 46 on average daily traffic volume - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Calhoun County, South Carolina

The three busiest roads in Calhoun County average 22,730 vehicles a day, 12.0 times the county average of 1,887 across all its monitored roads.

I 26 leads with 56,235 vehicles a day, 11,671 of them trucks (20.8%). That is 8.2 times the next road, Saint Matthews Road (6,880). It tops the truck ranking too, with the most trucks.

Trips using I 26 are long: a median of 61.2 minutes against 33.1 county-wide, the mark of a through route.

Harry C Raysor Drive skews older: its drivers' median age is 52.3, compared with 44.8 county-wide.

Few trucks use Saint Matthews Road: 7.5% of its traffic, under half the county's 16.4%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 26Motorway · 56,235vehicles11,671trucks · 20.8%
Road class
Motorway
Congestion ratio
58.7%
Median trip time
61.2 min
Drivers’ median age
43.8 yrs
Drivers’ average income
$68,734

I 26 is one of the more congested roads here: trips take 59% longer than at free-flow speed, against 7% county-wide.

2Saint Matthews RoadPrimary road · 6,880vehicles520trucks · 7.5%
Road class
Primary road
Congestion ratio
7.7%
Median trip time
29.9 min
Drivers’ median age
51.6 yrs
Drivers’ average income
$56,533

Saint Matthews Road peaks at 6,880 vehicles a day, 3.6 times the county average; trucks are 7.5% of it, below the county-wide 16.4%.

3Columbia Road NortheastPrimary road · 5,074vehicles470trucks · 9.3%
Road class
Primary road
Congestion ratio
11.8%
Median trip time
36.9 min
Drivers’ median age
50.4 yrs
Drivers’ average income
$57,825

Columbia Road Northeast carries 2.7 times the county average at its busiest, 470 of them trucks (9.3%, below the county-wide 16.4%).

4Harry C Raysor DrivePrimary road · 5,063vehicles362trucks · 7.2%
Road class
Primary road
Congestion ratio
12.4%
Median trip time
32.4 min
Drivers’ median age
52.3 yrs
Drivers’ average income
$55,215

Harry C Raysor Drive carries 2.7 times the county average on its busiest stretch, where the median trip lasts 32.4 minutes.

5US 21Primary road · 4,106vehicles365trucks · 8.9%
Road class
Primary road
Congestion ratio
9.8%
Median trip time
37.6 min
Drivers’ median age
51.2 yrs
Drivers’ average income
$62,839

At 2.2 times the county average, US 21 draws drivers from neighborhoods averaging $62,839 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 26Motorway · #1 by traffic56,235vehicles11,671trucks · 20.8%
2Saint Matthews RoadPrimary road · #2 by traffic6,880vehicles520trucks · 7.5%
3Columbia Road NortheastPrimary road · #3 by traffic5,074vehicles470trucks · 9.3%
4US 21Primary road · #5 by traffic4,106vehicles365trucks · 8.9%
5Harry C Raysor DrivePrimary road · #4 by traffic5,063vehicles362trucks · 7.2%
How to read these road counts
  • The first number is AADT, annual average daily traffic: the vehicles passing a point on an average day, both directions combined and trucks included. On a divided highway both carriageways are added together.
  • Traffic changes along a road, with more near interchanges and towns and less in open country. Every figure for a road describes its busiest stretch in the county, so the two rankings show the same numbers for the same road.
  • The second number is the trucks on that stretch, a part of its AADT. The bar splits the AADT into cars and light vehicles (blue) and trucks (amber).
  • See segment-level AADT for any road on TrafficZoom.

Data Sources & Methodology

The data presented on this page is derived from TrafficZoom's proprietary analytics platform, which aggregates and normalizes information from multiple sources, including:

Mobile device location data (anonymized and aggregated)

Road sensor networks and traffic counters

Historical traffic pattern databases

Public traffic count programs published by the

CalhounDepartment of Transportation

Demographic Baseline for O-D Modeling

U.S. Census Bureau
All metrics represent estimates based on statistical modeling and are intended for strategic planning purposes.
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Data current as of:
Q3 2026

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Counties near Calhoun County

The same traffic breakdown for the areas closest to Calhoun County, South Carolina.

Need segment-level traffic data?

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