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Traffic heat map of Chester County, South Carolina: 413 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 77 and Lancaster Highway

Chester County, South Carolina Traffic Counts

Traffic analytics for Chester County, South Carolina, calculated from real-world mobile and sensor networks on 4,197 road segments (413 road miles, about 519 ft each). Its busiest road, I 77, carries 44,163 vehicles a day, 14.9 times the average road. Use the figures below to move from assumptions to certainty on retail locations, logistics and road planning.
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 Chester County, South Carolina

Traffic

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

vehicles per day2,971
Trucks

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

15.7%
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.

46.2 yrs
Drivers’ average income

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

$64,437

A typical monitored road in Chester County, South Carolina sees 2,971 vehicles per day, while its 413 miles of monitored roads together handle 1,901,344 vehicle-miles traveled per day (≈694 million per year). About 1 in 6 vehicles is a truck, well above the 9.5% across South Carolina - a freight-heavy mix.

Congestion 59% below the South Carolina average

Chester sees 58% lower average daily traffic volume than the state average (2,971 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, Chester accounts for about 1.3% of South Carolina's statewide total of vehicle-miles. By volume, Chester's 2,971 vehicles per day trails 62% of counties in South Carolina.

Journey times run 7% higher than the state level, at 35.6 minutes on average. Its average travel time of 35.6 minutes is longer than 69% of counties in South Carolina.

The congestion ratio of 7.4% is 59% lower, pointing to smoother traffic flow than the state level - delays are rare enough to plan travel times almost to the minute.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Chester County, South Carolina

Trafficvehicles per day7,222
Trucks18.1%
Average travel time46.8 min
Congestion ratio12.9%
Drivers’ average age45.8 yrs
Drivers’ average income$68,431

Highways carry most of the traffic in Chester County, South Carolina: 77% of all vehicle-miles. The average highway carries 7,222 vehicles per day, 282% more than the average non-highway road in the same area, which carries 1,893 vehicles per day.

Highways make up 28% of the monitored road miles (117 miles, 849 segments), so they carry more than their share: 1,465,131 vehicle-miles traveled per day (≈535 million per year).

60% of counties in South Carolina move less traffic on their highways.

Higher highway truck share than 74% of counties in South Carolina

At 18.1%, highway truck share is 32% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

Chester's highway truck share (18.1%) is higher than 74% of counties in South Carolina. Chester's highway truck count is higher than 57% of counties in South Carolina, at roughly 1,309 trucks per day.

non-highway traffic icon

Non-highway Traffic in Chester County, South Carolina

Trafficvehicles per day1,893
Trucks7.5%
Average travel time32.7 min
Congestion ratio6.0%
Drivers’ average age48.6 yrs
Drivers’ average income$57,929

Local roads carry a smaller share of travel in Chester County, South Carolina, 23% of vehicle-miles; most driving happens on highways. A typical local road sees 1,893 vehicles per day.

Local roads make up 72% of the monitored road miles (296 miles in 3,348 segments) but carry less than their share of travel: 436,213 vehicle-miles traveled per day (≈159 million per year). About 1 in 13 vehicles on non-highway roads is a truck (7.5%).

Local congestion 65% below the South Carolina average

The concentration of trucks on non-highway roads is 59% lower than on highways.

Non-highway congestion (6.0%) runs 65% lower than the state average, pointing to smoother local traffic flow.

51% of counties in South Carolina see lower average driver income among trip origins than Chester. 76% of counties in South Carolina have an older driver population than Chester.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Chester County vs. South Carolina Traffic Comparison

Of the four measures, truck share differs most: Chester County runs 65% above the South Carolina average. Its average daily traffic per road, by contrast, is 58% below.

MetricChester CountySouth Carolina averageDifference
Traffic2,9717,040-57.8%
Truck % (Total Traffic)15.7%9.5%+65.3%
Truck % (Highway)18.1%13.7%+32.4%
Avg. Travel Time35.6 min33.3 min+6.9%

How Chester County compares

Chester County against nearby counties

Compared with its 4 closest neighbours, Chester County is 30.5% less congested and carries 31.5% less traffic on a typical road; it has the third busiest roads of the five. Freight passes through here that never reaches the areas around it: the truck share is high precisely because the local car traffic is not.

Chester 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
Chester County2,97115.7%1,901,34435.6 min7.4%
York County, South Carolina8,5367.7%6,161,72433.4 min18.1%
Fairfield County, South Carolina2,22716.4%1,599,90035.0 min6.6%
Lancaster County, South Carolina4,3566.7%1,879,32734.2 min10.9%
Union County, South Carolina2,2359.6%558,71932.3 min6.9%
South Carolina average7,0409.5%N/A33.3 min18.2%

Chester County ranked within South Carolina

Average driver age places Chester County #35 of 46 in South Carolina - the bottom quarter of the state.

Chester 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.
MeasureChester CountySouth Carolina rank
Traffic volume (AADT)2,971#29 of 46
Highway vehicle-miles per day1,465,131#18 of 43
Truck share on highways18.1%#12 of 43
Highway trucks per day1,309#19 of 43
Average travel time35.6 min#15 of 46
Average driver income$64,437#23 of 46
Average driver age46.2 yrs#35 of 46

Busiest roads in Chester County, South Carolina

Traffic concentrates on a few corridors: the three busiest roads average 22,143 vehicles a day, against 2,971 on the average road in Chester County.

I 77 leads with 44,163 vehicles a day, 9,348 of them trucks (21.2%). No other road comes close: Lancaster Highway, in second place, carries 11,406. It tops the truck ranking too, with the most trucks.

I 77 carries longer journeys than most roads here, with a median trip of 59.9 minutes against 35.6 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 77Motorway · 44,163vehicles9,348trucks · 21.2%
Road class
Motorway
Congestion ratio
52.8%
Median trip time
59.9 min
Drivers’ median age
44.6 yrs
Drivers’ average income
$80,194

Delays build on I 77: its congestion ratio of 53% over free-flow time is well above the county's 7%.

2Lancaster HighwayTrunk road · 11,406vehicles1,158trucks · 10.2%
Road class
Trunk road
Congestion ratio
14.3%
Median trip time
34.2 min
Drivers’ median age
47.0 yrs
Drivers’ average income
$58,953

At 3.8 times the county average, Lancaster Highway draws drivers from neighborhoods averaging $58,953 in household income.

3SC 9Trunk road · 10,859vehicles973trucks · 9.0%
Road class
Trunk road
Congestion ratio
16.9%
Median trip time
35.1 min
Drivers’ median age
47.2 yrs
Drivers’ average income
$60,822

Travel on SC 9's busiest stretch runs 17% over free-flow time, against 7% across the county, so expect slower peak hours.

4J A Cochran BypassTrunk road · 10,372vehicles804trucks · 7.8%
Road class
Trunk road
Congestion ratio
14.1%
Median trip time
33.8 min
Drivers’ median age
47.2 yrs
Drivers’ average income
$56,470

The busiest stretch of J A Cochran Bypass carries 3.5 times the county average; trucks are 7.8% of it, below the county-wide 15.7%.

5J A Cochran (Bypass)Primary road · 8,507vehicles452trucks · 5.3%
Road class
Primary road
Congestion ratio
11.2%
Median trip time
26.9 min
Drivers’ median age
47.8 yrs
Drivers’ average income
$54,868

On its busiest stretch, J A Cochran (Bypass) carries 2.9 times the county average; trucks are 5.3% of it, below the county-wide 15.7%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 77Motorway · #1 by traffic44,163vehicles9,348trucks · 21.2%
2Lancaster HighwayTrunk road · #2 by traffic11,406vehicles1,158trucks · 10.2%
3SC 9Trunk road · #3 by traffic10,859vehicles973trucks · 9.0%
4J A Cochran BypassTrunk road · #4 by traffic10,372vehicles804trucks · 7.8%
5Catawba River RoadTrunk road · 7,523vehicles789trucks · 10.5%
Road class
Trunk road
Congestion ratio
15.9%
Median trip time
34.4 min
Drivers’ median age
46.1 yrs
Drivers’ average income
$64,167

Catawba River Road peaks at 7,523 vehicles a day, 2.5 times the county average; trucks are 10.5% of it, below the county-wide 15.7%.

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

ChesterDepartment 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 Chester County

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

Need segment-level traffic data?

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