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Traffic heat map of Marlboro County, South Carolina: 340 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 95 and US 1

Marlboro County, South Carolina Traffic Counts

Trips here are the longest of any county in South Carolina, a median 59.0 minutes. This page breaks down traffic in Marlboro County, South Carolina across 340 miles of monitored roads split into 2,380 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
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 Marlboro County, South Carolina

Traffic

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

vehicles per day2,772
Trucks

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

10.5%
Average travel time

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

59.0 min
Congestion ratio

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

8.9%
Drivers’ average age

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

49.1 yrs
Drivers’ average income

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

$41,453

Our data shows 2,772 vehicles per day on the average road in Marlboro County, South Carolina, and 729,377 vehicle-miles traveled per day (≈266 million per year) across its 340 miles of monitored roads. Trucks are 10.5% of traffic, close to the 9.5% across South Carolina.

The longest trips of any county in South Carolina

Marlboro sees 61% lower average daily traffic volume than the state average (2,772 vehicles per day against 7,040), suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Network-wide, Marlboro accounts for about 0.5% of South Carolina's statewide total of vehicle-miles. Marlboro carries less traffic than 73% of counties in South Carolina.

The average trip takes 59.0 minutes, 77% higher than the state level. Marlboro additionally records the highest average travel time of any county in South Carolina - 59.0 minutes.

The congestion ratio of 8.9% is 51% lower, pointing to smoother traffic flow than the state level - free-flowing roads make scheduled deliveries highly predictable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Marlboro County, South Carolina

Trafficvehicles per day5,255
Trucks12.1%
Average travel time45.2 min
Congestion ratio12.1%
Drivers’ average age48.3 yrs
Drivers’ average income$41,295

A significant share of driving in Marlboro County, South Carolina, 38% of vehicle-miles, happens on highways. The average highway carries 5,255 vehicles per day, 136% more than the average non-highway road in the same area, which carries 2,229 vehicles per day.

With 17% of the road miles (60 miles in 427 segments), highways punch above their length, carrying 280,716 vehicle-miles traveled per day (≈102 million per year).

Fewer highway trucks than 86% of counties in South Carolina

Highway truck concentration here runs 12% lower than the state average, at 12.1%. The highway traffic mix is typical for South Carolina: neither freight- nor commuter-dominated.

64% of counties in South Carolina see a higher highway truck share than Marlboro's 12.1%. By raw truck volume, Marlboro carries fewer highway trucks than 86% of counties in South Carolina.

non-highway traffic icon

Non-highway Traffic in Marlboro County, South Carolina

Trafficvehicles per day2,229
Trucks9.5%
Average travel time62.0 min
Congestion ratio8.2%
Drivers’ average age50.0 yrs
Drivers’ average income$41,588

Local roads carry more than half of all travel in Marlboro County, South Carolina (62% of vehicle-miles). A typical local road sees 2,229 vehicles per day.

Local roads make up 83% of the monitored road miles (281 miles in 1,953 segments) but carry less than their share of travel: 448,661 vehicle-miles traveled per day (≈164 million per year). About 1 in 11 vehicles on non-highway roads is a truck (9.5%).

The lowest driver income of any county in South Carolina

The concentration of trucks on non-highway roads is 21% lower than on highways.

At 52% lower than the state level, the non-highway congestion ratio of 8.2% signals easier movement on local roads.

At $41,453, the average driver income for trips originating here is the lowest in South Carolina. The driver population here skews older than 69% of counties in South Carolina.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Marlboro County vs. South Carolina Traffic Comparison

The average travel time sets Marlboro County apart: 77% above the South Carolina average. Its average daily traffic per road, by contrast, is 61% below.

MetricMarlboro CountySouth Carolina averageDifference
Traffic2,7727,040-60.6%
Truck % (Total Traffic)10.5%9.5%+10.6%
Truck % (Highway)12.1%13.7%-11.7%
Avg. Travel Time59.0 min33.3 min+77.3%

How Marlboro County compares

Marlboro County moves the least traffic of its nearby counties

Compared with its 4 closest neighbours, Marlboro County sees 51.3% longer typical trips; it has the fourth busiest roads of the five. Trips here run longer without running slower: distance, not congestion, is what drivers spend their time on.

Marlboro 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
Marlboro County2,77210.5%729,37759.0 min8.9%
Dillon County, South Carolina3,10419.1%1,306,94746.8 min9.0%
Scotland County, North Carolina3,9899.9%960,24743.3 min11.7%
Darlington County, South Carolina3,8199.9%1,999,70132.6 min11.5%
Chesterfield County, South Carolina2,6169.7%1,092,83533.2 min7.0%
South Carolina average7,0409.5%N/A33.3 min18.2%

Marlboro County ranked within South Carolina

Marlboro County posts the highest average travel time of any county-level area in South Carolina.

Marlboro 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.
MeasureMarlboro CountySouth Carolina rank
Traffic volume (AADT)2,772#34 of 46
Highway vehicle-miles per day280,716#38 of 43
Truck share on highways12.1%#28 of 43
Highway trucks per day635#37 of 43
Average travel time59.0 min#1 of 46
Average driver income$41,453#46 of 46
Average driver age49.1 yrs#15 of 46

Marlboro County ranks #1 of 46 on average travel time but #46 of 46 on average driver income - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Marlboro County, South Carolina

On their busiest stretches, the three busiest roads in Marlboro County carry 16,370 vehicles a day on average, 5.9 times the typical road in the county (2,772).

I 95 leads with 23,339 vehicles a day, 5,705 of them trucks (24.4%). That is 78% more than the next road, US 1 (13,097). It tops the truck ranking too, with the most trucks.

Freight stands out on I 95: trucks are 24.4% of the traffic there, against 10.5% county-wide.

Blenheim Highway carries longer journeys than most roads here, with a median trip of 88.3 minutes against 59.0 county-wide.

Drivers on I 95 come from neighborhoods with an average household income of $57,722, 39% above the county average of $41,453.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 95Motorway · 23,339vehicles5,705trucks · 24.4%
Road class
Motorway
Median trip time
52.0 min
Drivers’ median age
47.0 yrs
Drivers’ average income
$57,722

I 95 carries 8.4 times the county average on its busiest stretch, where the median trip lasts 52.0 minutes.

2US 1Trunk road · 13,097vehicles1,034trucks · 7.9%
Road class
Trunk road
Congestion ratio
14.9%
Median trip time
41.0 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$42,552

US 1 is a local road at heart: the median trip using it lasts 41.0 minutes, against 59.0 for the county.

3Broad StreetPrimary road · 12,674vehicles1,058trucks · 8.3%
Road class
Primary road
Congestion ratio
30.6%
Median trip time
76.1 min
Drivers’ median age
50.2 yrs
Drivers’ average income
$45,840

Travel on Broad Street's busiest stretch runs 31% over free-flow time, against 9% across the county, so expect slower peak hours.

4US 15Trunk road · 11,920vehicles1,188trucks · 10.0%
Road class
Trunk road
Median trip time
54.8 min
Drivers’ median age
47.6 yrs
Drivers’ average income
$38,970

US 15 carries 4.3 times the county average on its busiest stretch, where the median trip lasts 54.8 minutes.

5SC 38Primary road · 10,760vehicles858trucks · 8.0%
Road class
Primary road
Median trip time
85.9 min
Drivers’ median age
50.8 yrs
Drivers’ average income
$46,051

Drivers on SC 38 are on long journeys, a median 85.9 minutes against 59.0 county-wide: a through route more than a local street.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 95Motorway · #1 by traffic23,339vehicles5,705trucks · 24.4%
2US 15Trunk road · #4 by traffic11,920vehicles1,188trucks · 10.0%
3Blenheim HighwayPrimary road · 9,385vehicles1,127trucks · 12.0%
Road class
Primary road
Median trip time
88.3 min
Drivers’ median age
50.7 yrs
Drivers’ average income
$47,391

At 3.4 times the county average, Blenheim Highway draws drivers from neighborhoods averaging $47,391 in household income.

4Broad StreetPrimary road · #3 by traffic12,674vehicles1,058trucks · 8.3%
5US 1Trunk road · #2 by traffic13,097vehicles1,034trucks · 7.9%
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

MarlboroDepartment 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 Marlboro County

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

Need segment-level traffic data?

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