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Traffic heat map of Berkeley County, South Carolina: 671 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Mark Clark Expressway

Berkeley County, South Carolina Traffic Counts

TrafficZoom tracks traffic on 671 road miles in Berkeley County, South Carolina, divided into 10,260 segments averaging 345 ft. Its drivers come from neighborhoods among the top 5 counties in South Carolina for household income. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Berkeley County, South Carolina

Traffic

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

vehicles per day9,605
Trucks

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

7.6%
Average travel time

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

32.4 min
Congestion ratio

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

25.1%
Drivers’ average age

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

43.6 yrs
Drivers’ average income

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

$84,863

The average monitored road in Berkeley County, South Carolina carries 9,605 vehicles per day. Across its 671 miles of monitored roads, that adds up to 5,252,992 vehicle-miles traveled per day (≈1.9 billion per year). About 1 in 13 vehicles is a truck, fewer than the 1 in 11 across South Carolina.

Busier roads than 89% of counties in South Carolina

Berkeley sees 36% higher average daily traffic volume than the state average (9,605 vehicles per day against 7,040), suggesting more demand on each road - more exposure for roadside businesses, and more competition for road space. Across the whole network, that travel is about 3.6% of South Carolina's statewide total. 89% of counties in South Carolina see less traffic than Berkeley's 9,605 vehicles per day.

At 32.4 minutes, the average travel time matches the state level closely. On travel time, Berkeley runs shorter than 84% of counties in South Carolina.

At 38% higher than the state level, the 25.1% congestion ratio signals more pronounced congestion - a factor for delivery windows and signal timing.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Berkeley County, South Carolina

Trafficvehicles per day19,907
Trucks11.1%
Average travel time32.9 min
Congestion ratio38.0%
Drivers’ average age43.8 yrs
Drivers’ average income$83,718

Highways carry a significant share of travel in Berkeley County, South Carolina: 38% of all vehicle-miles. The average highway carries 19,907 vehicles per day, 128% more than the average non-highway road in the same area, which carries 8,734 vehicles per day.

With 14% of the road miles (96 miles in 800 segments), highways punch above their length, carrying 2,007,909 vehicle-miles traveled per day (≈733 million per year).

That is more highway travel volume than 71% of counties in South Carolina.

Lower highway truck share than 76% of counties in South Carolina

The concentration of trucks on highways (11.1%) is 19% lower than the state average for similar road classifications. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 76% of counties in South Carolina. 60% of counties in South Carolina see fewer highway trucks per day than Berkeley's roughly 2,214.

non-highway traffic icon

Non-highway Traffic in Berkeley County, South Carolina

Trafficvehicles per day8,734
Trucks5.3%
Average travel time32.4 min
Congestion ratio24.0%
Drivers’ average age43.5 yrs
Drivers’ average income$85,489

Local roads carry more than half of all travel in Berkeley County, South Carolina (62% of vehicle-miles). A typical local road sees 8,734 vehicles per day.

Local roads make up 86% of the monitored road miles (575 miles in 9,460 segments) but carry less than their share of travel: 3,245,083 vehicle-miles traveled per day (≈1.2 billion per year). Trucks make up 5.3% of non-highway traffic, about 1 in 19 vehicles.

Drivers from higher-income areas than 93% of counties in South Carolina

Compared to highways, non-highway routes see 52% fewer trucks by share.

At 42% higher than the state level, the non-highway congestion ratio of 24.0% signals more friction on local roads.

93% of counties in South Carolina see lower average driver income among trip origins than Berkeley. Berkeley's median driver age is lower than 93% of counties in South Carolina.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Berkeley County vs. South Carolina Traffic Comparison

Of the four measures, average daily traffic per road differs most: Berkeley County runs 36% above the South Carolina average. Its truck share, by contrast, is 20% below.

MetricBerkeley CountySouth Carolina averageDifference
Traffic9,6057,040+36.4%
Truck % (Total Traffic)7.6%9.5%-20.4%
Truck % (Highway)11.1%13.7%-18.8%
Avg. Travel Time32.4 min33.3 min-2.6%

How Berkeley County compares

Berkeley County against nearby counties

Nothing in this table sets Berkeley County sharply apart from the 4 areas nearest to it, though it has the third busiest roads of the five.

Berkeley 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
Berkeley County9,6057.6%5,252,99232.4 min25.1%
Charleston County, South Carolina13,5756.3%11,678,51631.9 min30.6%
Dorchester County, South Carolina10,61511.0%3,816,72035.2 min30.9%
Williamsburg County, South Carolina2,4579.3%848,51336.0 min7.7%
Georgetown County, South Carolina5,8957.3%1,977,60836.1 min14.1%
South Carolina average7,0409.5%N/A33.3 min18.2%

Berkeley County ranked within South Carolina

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

Berkeley 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.
MeasureBerkeley CountySouth Carolina rank
Traffic volume (AADT)9,605#6 of 46
Highway vehicle-miles per day2,007,909#13 of 43
Truck share on highways11.1%#33 of 43
Highway trucks per day2,214#18 of 43
Average travel time32.4 min#39 of 46
Average driver income$84,863#4 of 46
Average driver age43.6 yrs#43 of 46

Berkeley County ranks #4 of 46 on average driver income but #43 of 46 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Berkeley County, South Carolina

The three busiest roads in Berkeley County average 56,016 vehicles a day, 5.8 times the county average of 9,605 across all its monitored roads.

Mark Clark Expressway leads with 68,810 vehicles a day, 8,236 of them trucks (12.0%). It tops the truck ranking too, with the most trucks.

Trucks make up 14.1% of traffic on I 26, against 7.6% across all roads in the county.

Trips using I 26 are long: a median of 44.1 minutes against 32.4 county-wide, the mark of a through route.

Mark Clark Expressway draws drivers from wealthier areas: their neighborhoods average $107,124 in household income, 26% above the county's $84,863.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Mark Clark ExpresswayMotorway · 68,810vehicles8,236trucks · 12.0%
Road class
Motorway
Congestion ratio
63.8%
Median trip time
36.6 min
Drivers’ median age
44.1 yrs
Drivers’ average income
$107,124

Mark Clark Expressway is one of the more congested roads here: trips take 64% longer than at free-flow speed, against 25% county-wide.

2I 26Motorway · 57,490vehicles8,125trucks · 14.1%
Road class
Motorway
Congestion ratio
43.9%
Median trip time
44.1 min
Drivers’ median age
44.5 yrs
Drivers’ average income
$83,473

I 26 is a trunk route for the county, carrying 6.0 times the county average on its busiest stretch; trucks are 14.1% of it, above the county-wide 7.6%.

3Main StreetPrimary road · 41,748vehicles1,650trucks · 4.0%
Road class
Primary road
Congestion ratio
51.9%
Median trip time
36.0 min
Drivers’ median age
44.0 yrs
Drivers’ average income
$83,464

Main Street peaks at 41,748 vehicles a day, 4.3 times the county average; trucks are 4.0% of it, below the county-wide 7.6%.

4US 52Trunk road · 37,681vehicles1,777trucks · 4.7%
Road class
Trunk road
Congestion ratio
53.7%
Median trip time
29.4 min
Drivers’ median age
44.4 yrs
Drivers’ average income
$67,511

Delays build on US 52: its congestion ratio of 54% over free-flow time is well above the county's 25%.

5Live Oak DrivePrimary road · 35,750vehicles1,881trucks · 5.3%
Road class
Primary road
Congestion ratio
41.5%
Median trip time
29.2 min
Drivers’ median age
44.3 yrs
Drivers’ average income
$81,911

Live Oak Drive carries 3.7 times the county average at its busiest, 1,881 of them trucks (5.3%, below the county-wide 7.6%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1Mark Clark ExpresswayMotorway · #1 by traffic68,810vehicles8,236trucks · 12.0%
2I 26Motorway · #2 by traffic57,490vehicles8,125trucks · 14.1%
3US 17 Alt / US 52Trunk road · 34,729vehicles2,301trucks · 6.6%
Road class
Trunk road
Congestion ratio
47.7%
Median trip time
30.5 min
Drivers’ median age
44.3 yrs
Drivers’ average income
$64,458

US 17 Alt / US 52 carries 3.6 times the county average on its busiest stretch, where the median trip lasts 30.5 minutes.

4Live Oak DrivePrimary road · #5 by traffic35,750vehicles1,881trucks · 5.3%
5US 52Trunk road · #4 by traffic37,681vehicles1,777trucks · 4.7%
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

BerkeleyDepartment 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 Berkeley County

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

Need segment-level traffic data?

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