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Traffic heat map of Clarendon County, South Carolina: 444 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 95 and Paxville Highway

Clarendon County, South Carolina Traffic Counts

How busy are the roads of Clarendon County, South Carolina? We measure 444 road miles, divided into 3,902 segments, with multi-sourced, cross-verified mobile and sensor data. Its highways carry one of the top 3 truck shares of any county in South Carolina. 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 Clarendon County, South Carolina

Traffic

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

vehicles per day3,155
Trucks

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

18.3%
Average travel time

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

32.5 min
Congestion ratio

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

9.2%
Drivers’ average age

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

51.9 yrs
Drivers’ average income

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

$54,229

A typical monitored road in Clarendon County, South Carolina sees 3,155 vehicles per day, while its 444 miles of monitored roads together handle 1,778,904 vehicle-miles traveled per day (≈649 million per year). Freight weighs heavily here: trucks are 18.3% of traffic, against 9.5% across South Carolina.

Shorter trips than 82% of counties in South Carolina

At 3,155 vehicles per day, the average monitored road in Clarendon carries 55% less traffic than the state average of 7,040, suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. In total volume terms, its road network carries about 1.2% of South Carolina's statewide total of vehicle-miles. By volume, Clarendon's 3,155 vehicles per day trails 58% of counties in South Carolina.

At 32.5 minutes, the average travel time matches the state level closely. 82% of counties in South Carolina have a longer average travel time than Clarendon's 32.5 minutes.

Congestion runs 49% lower than the state level, at a ratio of 9.2%, which means smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Clarendon County, South Carolina

Trafficvehicles per day8,045
Trucks23.4%
Average travel time46.5 min
Congestion ratio13.8%
Drivers’ average age51.2 yrs
Drivers’ average income$56,066

Highways carry more than half of all travel in Clarendon County, South Carolina (69% of vehicle-miles). The average highway carries 8,045 vehicles per day, 230% more than the average non-highway road in the same area, which carries 2,438 vehicles per day.

Highways make up 24% of the monitored road miles (104 miles, 499 segments), so they carry more than their share: 1,235,498 vehicle-miles traveled per day (≈451 million per year).

52% of counties in South Carolina move less traffic on their highways.

Higher highway truck share than 95% of counties in South Carolina

Highway truck concentration here runs 71% higher than the state average, at 23.4%. That marks Clarendon as a major freight corridor, where highway access is what logistics operators compete on.

By truck concentration, highways here outrank 95% of counties in South Carolina. Clarendon's highway truck count is higher than 67% of counties in South Carolina, at roughly 1,881 trucks per day.

non-highway traffic icon

Non-highway Traffic in Clarendon County, South Carolina

Trafficvehicles per day2,438
Trucks6.6%
Average travel time30.4 min
Congestion ratio8.5%
Drivers’ average age52.6 yrs
Drivers’ average income$52,994

Local roads carry a significant share of travel in Clarendon County, South Carolina: 31% of all vehicle-miles. A typical local road sees 2,438 vehicles per day.

Spread over 339 miles and 3,403 segments, 76% of the road network, local roads carry a lighter load per mile: 543,406 vehicle-miles traveled per day (≈198 million per year). About 1 in 15 vehicles on non-highway roads is a truck (6.6%).

Older drivers than 91% of counties in South Carolina

Compared to highways, non-highway routes see 72% fewer trucks by share.

The non-highway congestion ratio of 8.5% is 50% lower than the state level, suggesting more efficient local mobility than the state average.

Trip origins here have lower average income than 78% of counties in South Carolina. 91% of counties in South Carolina have a younger driver population than Clarendon.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Clarendon County vs. South Carolina Traffic Comparison

The truck share sets Clarendon County apart: 92% above the South Carolina average. Its highway truck share is also 71% above.

MetricClarendon CountySouth Carolina averageDifference
Traffic3,1557,040-55.2%
Truck % (Total Traffic)18.3%9.5%+92.2%
Truck % (Highway)23.4%13.7%+70.8%
Avg. Travel Time32.5 min33.3 min-2.4%

How Clarendon County compares

Clarendon County has a higher truck share than any nearby county

Against the 4 nearest areas, Clarendon County runs 5.5 percentage points more truck traffic; it has the second 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.

Clarendon 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
Clarendon County3,15518.3%1,778,90432.5 min9.2%
Sumter County, South Carolina5,43210.0%2,622,82233.8 min15.6%
Williamsburg County, South Carolina2,4579.3%848,51336.0 min7.7%
Calhoun County, South Carolina1,88716.4%1,706,51633.1 min7.1%
Lee County, South Carolina2,22215.5%1,076,63635.6 min7.4%
South Carolina average7,0409.5%N/A33.3 min18.2%

Clarendon County ranked within South Carolina

On truck share on highways, Clarendon County is among the three highest county-level areas in South Carolina.

Clarendon 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.
MeasureClarendon CountySouth Carolina rank
Traffic volume (AADT)3,155#27 of 46
Highway vehicle-miles per day1,235,498#21 of 43
Truck share on highways23.4%#3 of 43
Highway trucks per day1,881#15 of 43
Average travel time32.5 min#38 of 46
Average driver income$54,229#36 of 46
Average driver age51.9 yrs#5 of 46

The two ends of this table sit far apart: #3 of 43 on truck share on highways, against #38 of 46 on average travel time.

Busiest roads in Clarendon County, South Carolina

Traffic concentrates on a few corridors: the three busiest roads average 22,359 vehicles a day, against 3,155 on the average road in Clarendon County.

I 95 leads with 40,014 vehicles a day, 8,726 of them trucks (21.8%). That is 2.9 times the next road, Paxville Highway (13,794). It also carries the most trucks.

Trips using I 95 are long: a median of 53.6 minutes against 32.5 county-wide, the mark of a through route.

Boyce Street is busy with cars rather than freight: only 4.1% of its traffic is trucks, against 18.3% county-wide.

The truck ranking looks different from the traffic one, sharing just 2 of its 5 roads.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 95Motorway · 40,014vehicles8,726trucks · 21.8%
Road class
Motorway
Congestion ratio
42.5%
Median trip time
53.6 min
Drivers’ median age
51.8 yrs
Drivers’ average income
$49,568

Travel on I 95's busiest stretch runs 42% over free-flow time, against 9% across the county, so expect slower peak hours.

2Paxville HighwayPrimary road · 13,794vehicles639trucks · 4.6%
Road class
Primary road
Congestion ratio
15.8%
Median trip time
29.7 min
Drivers’ median age
52.5 yrs
Drivers’ average income
$46,730

On its busiest stretch, Paxville Highway carries 4.4 times the county average; trucks are 4.6% of it, below the county-wide 18.3%.

3Boyce StreetPrimary road · 13,269vehicles538trucks · 4.1%
Road class
Primary road
Congestion ratio
27.5%
Median trip time
34.9 min
Drivers’ median age
51.8 yrs
Drivers’ average income
$46,550

Boyce Street is one of the more congested roads here: trips take 27% longer than at free-flow speed, against 9% county-wide.

4Main StreetTrunk road · 11,085vehicles1,168trucks · 10.5%
Road class
Trunk road
Congestion ratio
16.3%
Median trip time
33.0 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$59,837

Main Street peaks at 11,085 vehicles a day, 3.5 times the county average; trucks are 10.5% of it, below the county-wide 18.3%.

5Brooks StreetTrunk road · 9,908vehicles666trucks · 6.7%
Road class
Trunk road
Median trip time
29.1 min
Drivers’ median age
51.7 yrs
Drivers’ average income
$52,969

Brooks Street carries 3.1 times the county average at its busiest, 666 of them trucks (6.7%, below the county-wide 18.3%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 95Motorway · #1 by traffic40,014vehicles8,726trucks · 21.8%
2Main StreetTrunk road · #4 by traffic11,085vehicles1,168trucks · 10.5%
3Clarence Coker HighwayTrunk road · 7,058vehicles854trucks · 12.1%
Road class
Trunk road
Congestion ratio
11.8%
Median trip time
37.4 min
Drivers’ median age
48.5 yrs
Drivers’ average income
$60,735

Clarence Coker Highway carries 2.2 times the county average on its busiest stretch, where the median trip lasts 37.4 minutes.

4Myrtle Beach HighwayTrunk road · 6,132vehicles777trucks · 12.7%
Road class
Trunk road
Median trip time
42.1 min
Drivers’ median age
46.8 yrs
Drivers’ average income
$61,848

Myrtle Beach Highway carries 94% more than the county average on its busiest stretch, where the median trip lasts 42.1 minutes.

5US 521Trunk road · 7,874vehicles751trucks · 9.5%
Road class
Trunk road
Congestion ratio
10.0%
Median trip time
34.3 min
Drivers’ median age
50.8 yrs
Drivers’ average income
$57,505

At 2.5 times the county average, US 521 draws drivers from neighborhoods averaging $57,505 in household income.

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

ClarendonDepartment 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 Clarendon County

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

Need segment-level traffic data?

Identify traffic patterns street by street and analyze the exact corridors that matter to your project.