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Traffic heat map of Lee County, South Carolina: 309 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 20 and Main Street

Lee County, South Carolina Traffic Counts

How busy are the roads of Lee County, South Carolina? We measure 309 road miles, divided into 2,442 segments, with multi-sourced, cross-verified mobile and sensor data. About 1 in 6 vehicles here is a truck, against 1 in 11 across 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 Lee County, South Carolina

Traffic

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

vehicles per day2,222
Trucks

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

15.5%
Average travel time

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

35.6 min
Congestion ratio

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

7.4%
Drivers’ average age

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

46.7 yrs
Drivers’ average income

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

$56,511

A typical monitored road in Lee County, South Carolina sees 2,222 vehicles per day, while its 309 miles of monitored roads together handle 1,076,636 vehicle-miles traveled per day (≈393 million per year). About 1 in 6 vehicles is a truck, well above the 9.5% across South Carolina - a freight-heavy mix.

Quieter roads than 89% of counties in South Carolina

Lee sees 68% lower average daily traffic volume than the state average (2,222 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. Across the whole network, that travel is about 0.7% of South Carolina's statewide total. Lee carries less traffic than 89% of counties in South Carolina.

At 35.6 minutes, the average travel time is 7% higher than the state level. On travel time, Lee runs longer than 71% of counties in South Carolina.

Congestion runs 60% lower than the state level, at a ratio of 7.4%, which means smoother traffic flow - delays are rare enough to plan travel times almost to the minute.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Lee County, South Carolina

Trafficvehicles per day13,628
Trucks19.4%
Average travel time63.4 min
Congestion ratio30.3%
Drivers’ average age45.7 yrs
Drivers’ average income$66,378

Highways carry more than half of all travel in Lee County, South Carolina (63% of vehicle-miles). The average highway carries 13,628 vehicles per day, 576% more than the average non-highway road in the same area, which carries 2,017 vehicles per day.

Yet highways are only 15% of the road network, 48 miles in 43 segments, so each mile of them is 4.1 times as busy as the average road mile.

Higher highway truck share than 83% of counties in South Carolina

Highway truck concentration here runs 42% higher than the state average, at 19.4%. Highways here lean toward freight, so highway access is a real asset for logistics operators.

By truck concentration, highways here outrank 83% of counties in South Carolina. By raw truck volume, Lee carries more highway trucks than 69% of counties in South Carolina.

non-highway traffic icon

Non-highway Traffic in Lee County, South Carolina

Trafficvehicles per day2,017
Trucks8.8%
Average travel time35.1 min
Congestion ratio6.9%
Drivers’ average age47.7 yrs
Drivers’ average income$47,478

A significant share of driving in Lee County, South Carolina, 37% of vehicle-miles, happens on local roads. A typical local road sees 2,017 vehicles per day.

Spread over 262 miles and 2,399 segments, 85% of the road network, local roads carry a lighter load per mile: 395,352 vehicle-miles traveled per day (≈144 million per year). Trucks make up 8.8% of non-highway traffic, about 1 in 11 vehicles.

Local congestion 59% below the South Carolina average

Non-highway roads carry a truck concentration that's 55% lower than the highway network.

At 59% lower than the state level, the non-highway congestion ratio of 6.9% signals easier movement on local roads.

Lee's average driver income is lower than 71% of counties in South Carolina. Lee's median driver age is lower than 72% of counties in South Carolina.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Lee County vs. South Carolina Traffic Comparison

The average daily traffic per road sets Lee County apart: 68% below the South Carolina average. Its truck share, by contrast, is 64% above.

MetricLee CountySouth Carolina averageDifference
Traffic2,2227,040-68.4%
Truck % (Total Traffic)15.5%9.5%+63.6%
Truck % (Highway)19.4%13.7%+42.0%
Avg. Travel Time35.6 min33.3 min+7.0%

How Lee County compares

Lee County moves the least traffic of its nearby counties

Against the 4 nearest areas, Lee County carries 47.6% less traffic on a typical road and is 37.9% less congested; it has the quietest roads of the five. Less traffic and more room for it - the roads here run both quieter and freer than the areas around them.

Lee 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
Lee County2,22215.5%1,076,63635.6 min7.4%
Sumter County, South Carolina5,43210.0%2,622,82233.8 min15.6%
Kershaw County, South Carolina4,56410.8%2,266,07133.1 min11.1%
Darlington County, South Carolina3,8199.9%1,999,70132.6 min11.5%
Clarendon County, South Carolina3,15518.3%1,778,90432.5 min9.2%
South Carolina average7,0409.5%N/A33.3 min18.2%

Lee County ranked within South Carolina

Average daily traffic volume places Lee County #41 of 46 in South Carolina - the bottom quarter of the state.

Lee 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.
MeasureLee CountySouth Carolina rank
Traffic volume (AADT)2,222#41 of 46
Highway vehicle-miles per day681,284#32 of 43
Truck share on highways19.4%#8 of 43
Highway trucks per day2,649#14 of 43
Average travel time35.6 min#14 of 46
Average driver income$56,511#33 of 46
Average driver age46.7 yrs#33 of 46

Lee County ranks #8 of 43 on truck share on highways but #41 of 46 on average daily traffic volume - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Lee County, South Carolina

On their busiest stretches, the three busiest roads in Lee County carry 15,357 vehicles a day on average, 6.9 times the typical road in the county (2,222).

I 20 is the busiest road, at 28,371 vehicles a day, 5,514 of them trucks (19.4%). That is 2.6 times the next road, Main Street (11,008). It also carries the most trucks.

Trips using I 20 are long: a median of 63.4 minutes against 35.6 county-wide, the mark of a through route.

Drivers on Wisacky Highway come from neighborhoods with an average household income of $36,677, 35% below the county average of $56,511.

Main Street is busy with cars rather than freight: only 6.7% of its traffic is trucks, against 15.5% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 20Motorway · 28,371vehicles5,514trucks · 19.4%
Road class
Motorway
Congestion ratio
30.3%
Median trip time
63.4 min
Drivers’ median age
45.7 yrs
Drivers’ average income
$66,378

Delays build on I 20: its congestion ratio of 30% over free-flow time is well above the county's 7%.

2Main StreetPrimary road · 11,008vehicles738trucks · 6.7%
Road class
Primary road
Congestion ratio
26.9%
Median trip time
34.7 min
Drivers’ median age
47.7 yrs
Drivers’ average income
$43,376

Travel on Main Street's busiest stretch runs 27% over free-flow time, against 7% across the county, so expect slower peak hours.

3Sumter HighwayPrimary road · 6,691vehicles619trucks · 9.2%
Road class
Primary road
Congestion ratio
13.8%
Median trip time
33.9 min
Drivers’ median age
47.4 yrs
Drivers’ average income
$43,807

Sumter Highway carries 3.0 times the county average at its busiest, 619 of them trucks (9.2%, below the county-wide 15.5%).

4Hartsville HighwayPrimary road · 5,658vehicles533trucks · 9.4%
Road class
Primary road
Congestion ratio
11.7%
Median trip time
36.4 min
Drivers’ median age
48.0 yrs
Drivers’ average income
$51,216

Hartsville Highway carries 2.5 times the county average on its busiest stretch, where the median trip lasts 36.4 minutes.

5Wisacky HighwaySecondary road · 4,313vehicles322trucks · 7.5%
Road class
Secondary road
Congestion ratio
11.3%
Median trip time
39.6 min
Drivers’ median age
46.6 yrs
Drivers’ average income
$36,677

At 94% more than the county average, Wisacky Highway draws drivers from neighborhoods averaging $36,677 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 20Motorway · #1 by traffic28,371vehicles5,514trucks · 19.4%
2Main StreetPrimary road · #2 by traffic11,008vehicles738trucks · 6.7%
3Sumter HighwayPrimary road · #3 by traffic6,691vehicles619trucks · 9.2%
4Hartsville HighwayPrimary road · #4 by traffic5,658vehicles533trucks · 9.4%
5N Main StPrimary road · 3,855vehicles418trucks · 10.8%
Road class
Primary road
Congestion ratio
9.2%
Median trip time
36.5 min
Drivers’ median age
49.8 yrs
Drivers’ average income
$45,606

N Main St is busy by local standards, at 74% more than the county average on its busiest stretch; trucks are 10.8% of it, below the county-wide 15.5%.

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

LeeDepartment 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 Lee County

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

Need segment-level traffic data?

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