Need segment-level traffic data?

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

Get insights →
Traffic heat map of Barnwell County, South Carolina: 237 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Dunbarton Boulevard

Barnwell County, South Carolina Traffic Counts

Our Barnwell County, South Carolina traffic data covers 2,362 road segments over 237 road miles, with an average segment of just 530 ft. Its busiest road, Dunbarton Boulevard, carries 15,913 vehicles a day, 5.6 times the average road. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
Find my place
total traffic icon

Total Traffic Volume & Performance in Barnwell County, South Carolina

Traffic

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

vehicles per day2,821
Trucks

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

8.0%
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.

8.4%
Drivers’ average age

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

48.5 yrs
Drivers’ average income

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

$48,493

The average monitored road in Barnwell County, South Carolina carries 2,821 vehicles per day. Across its 237 miles of monitored roads, that adds up to 457,248 vehicle-miles traveled per day (≈167 million per year). Trucks are a smaller part of the mix than across South Carolina: 8.0% against 9.5%.

Traffic 60% below the South Carolina average

Barnwell's average daily traffic volume is 60% lower than the state average - 2,821 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 0.3% of South Carolina's statewide total. Barnwell carries less traffic than 69% of counties in South Carolina.

At 33.1 minutes, the average travel time matches the state level closely. 67% of counties in South Carolina have a longer average travel time than Barnwell's 33.1 minutes.

The congestion ratio of 8.4% is 54% lower, pointing to smoother traffic flow than the state level - free-flowing roads make scheduled deliveries highly predictable.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Barnwell County vs. South Carolina Traffic Comparison

The average daily traffic per road sets Barnwell County apart: 60% below the South Carolina average. Its truck share is also 16% below.

MetricBarnwell CountySouth Carolina averageDifference
Traffic2,8217,040-59.9%
Truck % (Total Traffic)8.0%9.5%-15.9%
Avg. Travel Time33.1 min33.3 min-0.5%

How Barnwell County compares

Barnwell County has the lowest truck share of its nearby counties

Against the 4 nearest areas, Barnwell County moves 30.1% of the total daily travel; it has the second busiest roads of the five. The same kind of road, just less of it: traffic per road matches the areas around it while the network itself is smaller.

Barnwell 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
Barnwell County2,8218.0%457,24833.1 min8.4%
Aiken County, South Carolina6,11411.2%4,778,13531.1 min13.8%
Bamberg County, South Carolina1,8209.7%319,44835.8 min5.1%
Allendale County, South Carolina1,77512.0%189,12240.5 min5.9%
Burke County, Georgia2,35813.4%784,99135.3 min7.0%
South Carolina average7,0409.5%N/A33.3 min18.2%

Barnwell County ranked within South Carolina

Average driver income places Barnwell County #43 of 46 in South Carolina - the bottom quarter of the state.

Barnwell County ranked among 46 county-level areas in South Carolina (1 = highest).
MeasureBarnwell CountySouth Carolina rank
Traffic volume (AADT)2,821#32 of 46
Average travel time33.1 min#31 of 46
Average driver income$48,493#43 of 46
Average driver age48.5 yrs#17 of 46

Busiest roads in Barnwell County, South Carolina

Traffic concentrates on a few corridors: the three busiest roads average 10,023 vehicles a day, against 2,821 on the average road in Barnwell County.

Dunbarton Boulevard is the busiest road, at 15,913 vehicles a day, 889 of them trucks (5.6%). That is 2.2 times the next road, Church Street (7,172). It also carries the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Dunbarton BoulevardPrimary road · 15,913vehicles889trucks · 5.6%
Road class
Primary road
Median trip time
30.6 min
Drivers’ median age
47.8 yrs
Drivers’ average income
$47,424

A main artery: Dunbarton Boulevard's busiest stretch carries 5.6 times the county average; trucks are 5.6% of it, below the county-wide 8.0%.

2Church StreetPrimary road · 7,172vehicles603trucks · 8.4%
Road class
Primary road
Congestion ratio
16.9%
Median trip time
39.5 min
Drivers’ median age
49.0 yrs
Drivers’ average income
$53,125

Church Street is one of the more congested roads here: trips take 17% longer than at free-flow speed, against 8% county-wide.

3Marlboro AvenuePrimary road · 6,986vehicles565trucks · 8.1%
Road class
Primary road
Congestion ratio
16.9%
Median trip time
34.5 min
Drivers’ median age
48.3 yrs
Drivers’ average income
$42,821

Marlboro Avenue peaks at 6,986 vehicles a day, 2.5 times the county average; trucks are 8.1% of it, in line with the county-wide 8.0%.

4US 278Primary road · 6,362vehicles572trucks · 9.0%
Road class
Primary road
Congestion ratio
14.5%
Median trip time
35.7 min
Drivers’ median age
48.5 yrs
Drivers’ average income
$41,008

US 278 carries 2.3 times the county average at its busiest, 572 of them trucks (9.0%, above the county-wide 8.0%).

5Main StreetPrimary road · 6,112vehicles517trucks · 8.5%
Road class
Primary road
Congestion ratio
21.9%
Median trip time
36.0 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$45,812

Delays build on Main Street: its congestion ratio of 22% over free-flow time is well above the county's 8%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Dunbarton BoulevardPrimary road · #1 by traffic15,913vehicles889trucks · 5.6%
2Church StreetPrimary road · #2 by traffic7,172vehicles603trucks · 8.4%
3US 278Primary road · #4 by traffic6,362vehicles572trucks · 9.0%
4Marlboro AvenuePrimary road · #3 by traffic6,986vehicles565trucks · 8.1%
5US 78Primary road · 6,064vehicles552trucks · 9.1%
Road class
Primary road
Median trip time
41.5 min
Drivers’ median age
49.0 yrs
Drivers’ average income
$53,608

US 78 carries 2.1 times the county average on its busiest stretch, where the median trip lasts 41.5 minutes.

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

BarnwellDepartment 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.
link arrow icon
Data current as of:
Q3 2026

Explore further

TrafficZoom platform

— street-level analytics and custom corridor reports.

Map AI

— demographics, housing and mobility data.

Counties near Barnwell County

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

Need segment-level traffic data?

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