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Traffic heat map of Horry County, South Carolina: 1,246 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 501

Horry County, South Carolina Traffic Counts

How busy are the roads of Horry County, South Carolina? We measure 1,246 road miles, divided into 17,340 segments, with multi-sourced, cross-verified mobile and sensor data. Its highways carry the lowest truck share of any county in South Carolina, 5.9%. 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 Horry County, South Carolina

Traffic

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

vehicles per day8,576
Trucks

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

5.3%
Average travel time

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

33.3 min
Congestion ratio

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

23.4%
Drivers’ average age

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

53.4 yrs
Drivers’ average income

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

$66,022

Our data shows 8,576 vehicles per day on the average road in Horry County, South Carolina, and 9,928,206 vehicle-miles traveled per day (≈3.6 billion per year) across its 1,246 miles of monitored roads. Traffic here is mostly passenger cars: only 5.3% trucks, against 9.5% across South Carolina.

Busier roads than 84% of counties in South Carolina

At 8,576 vehicles per day, the average monitored road in Horry carries 22% more traffic than the state average of 7,040, suggesting more demand on each road - a critical factor for logistics and site planning. Network-wide, Horry accounts for about 6.8% of South Carolina's statewide total of vehicle-miles. By volume, Horry's 8,576 vehicles per day outpaces 84% of counties in South Carolina.

The average trip takes 33.3 minutes, on par with the state level. 58% of counties in South Carolina have a longer average travel time than Horry's 33.3 minutes.

Congestion runs 29% higher than the state level, at a ratio of 23.4%, which means more pronounced congestion - a factor for delivery windows and signal timing.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Horry County, South Carolina

Trafficvehicles per day17,492
Trucks5.9%
Average travel time35.6 min
Congestion ratio37.7%
Drivers’ average age53.9 yrs
Drivers’ average income$67,165

Highways carry about half of all travel in Horry County, South Carolina, 51% of vehicle-miles. The average highway carries 17,492 vehicles per day, 149% more than the average non-highway road in the same area, which carries 7,024 vehicles per day.

Highways make up 28% of the monitored road miles (345 miles, 2,572 segments), so they carry more than their share: 5,095,446 vehicle-miles traveled per day (≈1.9 billion per year).

That puts Horry among the top 3 counties in South Carolina for highway travel volume.

The lowest highway truck share of any county in South Carolina

The concentration of trucks on highways (5.9%) is 57% lower than the state average for similar road classifications. Highways here carry mainly commuter and local trips, with little through freight.

Horry also posts the lowest highway truck share in South Carolina - 5.9%. Horry's highway truck count is lower than 74% of counties in South Carolina, at roughly 1,037 trucks per day.

non-highway traffic icon

Non-highway Traffic in Horry County, South Carolina

Trafficvehicles per day7,024
Trucks4.6%
Average travel time32.9 min
Congestion ratio20.9%
Drivers’ average age52.9 yrs
Drivers’ average income$64,971

Local roads carry about half of all travel in Horry County, South Carolina, 49% of vehicle-miles. On the average non-highway road, that comes to 7,024 vehicles per day.

Local roads make up 72% of the monitored road miles (901 miles in 14,768 segments) but carry less than their share of travel: 4,832,760 vehicle-miles traveled per day (≈1.8 billion per year). Trucks make up 4.6% of non-highway traffic, about 1 in 22 vehicles.

Older drivers than 96% of counties in South Carolina

Non-highway roads carry a truck concentration that's 23% lower than the highway network.

At 24% higher than the state level, the non-highway congestion ratio of 20.9% signals more friction on local roads.

Horry's average driver income is higher than 58% of counties in South Carolina. The driver population here skews older than 96% of counties in South Carolina.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and PM peak 4:00 PM–6:00 PM, with volumes reaching approximately 67% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 10% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +12% versus the annual average.
Lowest month:
January is the quietest month, with volumes -16% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Horry County, South Carolina, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +12% in high season.

Horry County vs. South Carolina Traffic Comparison

The highway truck share sets Horry County apart: 57% below the South Carolina average. Its truck share is also 44% below.

MetricHorry CountySouth Carolina averageDifference
Traffic8,5767,040+21.8%
Truck % (Total Traffic)5.3%9.5%-44.4%
Truck % (Highway)5.9%13.7%-56.7%
Avg. Travel Time33.3 min33.3 min+0.2%

How Horry County compares

Horry County moves more traffic than any nearby county

Against the 4 nearest areas, Horry County moves 6.2 times the total daily travel and is 103.2% more congested; it has the busiest roads of the five. It is where traffic concentrates in this corner of the map - the local bottleneck, with more vehicles per road AND less room to absorb them.

Horry 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
Horry County8,5765.3%9,928,20633.3 min23.4%
Marion County, South Carolina3,62410.3%1,295,59640.7 min9.9%
Columbus County, North Carolina4,10710.1%1,870,92343.6 min13.0%
Georgetown County, South Carolina5,8957.3%1,977,60836.1 min14.1%
Dillon County, South Carolina3,10419.1%1,306,94746.8 min9.0%
South Carolina average7,0409.5%N/A33.3 min18.2%

Horry County ranked within South Carolina

On highway travel volume and average driver age, Horry County is among the three highest county-level areas in South Carolina.

Horry 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.
MeasureHorry CountySouth Carolina rank
Traffic volume (AADT)8,576#8 of 46
Highway vehicle-miles per day5,095,446#3 of 43
Truck share on highways5.9%#43 of 43
Highway trucks per day1,037#32 of 43
Average travel time33.3 min#27 of 46
Average driver income$66,022#20 of 46
Average driver age53.4 yrs#3 of 46

Horry County ranks #3 of 43 on highway travel volume but #43 of 43 on truck share on highways. It carries some of the heaviest highway traffic in South Carolina, but very little of it is freight - this is commuter and local car volume, not through-trucking.

Busiest roads in Horry County, South Carolina

Traffic concentrates on a few corridors: the three busiest roads average 49,944 vehicles a day, against 8,576 on the average road in Horry County.

US 501 leads with 57,341 vehicles a day, 4,444 of them trucks (7.8%). It tops the truck ranking too, with the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 501Motorway · 57,341vehicles4,444trucks · 7.8%
Road class
Motorway
Congestion ratio
73.5%
Median trip time
34.4 min
Drivers’ median age
53.4 yrs
Drivers’ average income
$63,408

Travel on US 501's busiest stretch runs 74% over free-flow time, against 23% across the county, so expect slower peak hours.

2Robert M. Grissom ParkwayTrunk road · 46,458vehicles1,656trucks · 3.6%
Road class
Trunk road
Congestion ratio
54.8%
Median trip time
33.0 min
Drivers’ median age
53.5 yrs
Drivers’ average income
$69,729

Robert M. Grissom Parkway is one of the more congested roads here: trips take 55% longer than at free-flow speed, against 23% county-wide.

3Church StreetTrunk road · 46,034vehicles2,367trucks · 5.1%
Road class
Trunk road
Congestion ratio
34.8%
Median trip time
41.7 min
Drivers’ median age
51.5 yrs
Drivers’ average income
$60,648

A main artery: Church Street's busiest stretch carries 5.4 times the county average; trucks are 5.1% of it, in line with the county-wide 5.3%.

4Kings HighwayTrunk road · 45,475vehicles1,606trucks · 3.5%
Road class
Trunk road
Congestion ratio
29.7%
Median trip time
30.5 min
Drivers’ median age
53.9 yrs
Drivers’ average income
$69,129

Kings Highway is a trunk route for the county, carrying 5.3 times the county average on its busiest stretch; trucks are 3.5% of it, below the county-wide 5.3%.

5US 17Trunk road · 40,861vehicles1,360trucks · 3.3%
Road class
Trunk road
Congestion ratio
36.7%
Median trip time
31.7 min
Drivers’ median age
55.4 yrs
Drivers’ average income
$69,799

US 17 carries 4.8 times the county average on its busiest stretch, where the median trip lasts 31.7 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 501Motorway · #1 by traffic57,341vehicles4,444trucks · 7.8%
2Church StreetTrunk road · #3 by traffic46,034vehicles2,367trucks · 5.1%
3Carolina Bays ParkwayMotorway · 38,448vehicles1,938trucks · 5.0%
Road class
Motorway
Congestion ratio
25.8%
Median trip time
36.5 min
Drivers’ median age
54.7 yrs
Drivers’ average income
$70,096

At 4.5 times the county average, Carolina Bays Parkway draws drivers from neighborhoods averaging $70,096 in household income.

4Mark Garner HighwayTrunk road · 39,789vehicles1,866trucks · 4.7%
Road class
Trunk road
Congestion ratio
39.0%
Median trip time
32.5 min
Drivers’ median age
54.6 yrs
Drivers’ average income
$68,692

The busiest stretch of Mark Garner Highway carries 4.6 times the county average; trucks are 4.7% of it, below the county-wide 5.3%.

5Robert M. Grissom ParkwayTrunk road · #2 by traffic46,458vehicles1,656trucks · 3.6%
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

HorryDepartment 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 Horry County

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

Need segment-level traffic data?

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