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TrafficThe average number of vehicles that travel each day over any road in the road network. | vehicles per day9,605 |
|---|---|
TrucksThe percentage of the total traffic volume composed of heavy vehicles. | 7.6% |
Average travel timeThe average time of travel averaged among all vehicles traveling on the road network. | 32.4 min |
Congestion ratioThe rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network. | 25.1% |
Drivers’ average ageAverage age of residents in the geographic areas where the vehicle trips originated. | 43.6 yrs |
Drivers’ average incomeAverage 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.
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.
| Traffic | vehicles per day19,907 |
|---|---|
| Trucks | 11.1% |
| Average travel time | 32.9 min |
| Congestion ratio | 38.0% |
| Drivers’ average age | 43.8 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.
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.
| Traffic | vehicles per day8,734 |
|---|---|
| Trucks | 5.3% |
| Average travel time | 32.4 min |
| Congestion ratio | 24.0% |
| Drivers’ average age | 43.5 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.
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.
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.
| Metric | Berkeley County | South Carolina average | Difference |
|---|---|---|---|
| Traffic | 9,605 | 7,040 | +36.4% |
| Truck % (Total Traffic) | 7.6% | 9.5% | -20.4% |
| Truck % (Highway) | 11.1% | 13.7% | -18.8% |
| Avg. Travel Time | 32.4 min | 33.3 min | -2.6% |
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.
| Area | Average daily traffic | Truck share | Daily vehicle-miles | Average travel time | Congestion ratio |
|---|---|---|---|---|---|
| Berkeley County | 9,605 | 7.6% | 5,252,992 | 32.4 min | 25.1% |
| Charleston County, South Carolina | 13,575 | 6.3% | 11,678,516 | 31.9 min | 30.6% |
| Dorchester County, South Carolina | 10,615 | 11.0% | 3,816,720 | 35.2 min | 30.9% |
| Williamsburg County, South Carolina | 2,457 | 9.3% | 848,513 | 36.0 min | 7.7% |
| Georgetown County, South Carolina | 5,895 | 7.3% | 1,977,608 | 36.1 min | 14.1% |
| South Carolina average | 7,040 | 9.5% | N/A | 33.3 min | 18.2% |
Average driver age places Berkeley County #43 of 46 in South Carolina - the bottom quarter of the state.
| Measure | Berkeley County | South Carolina rank |
|---|---|---|
| Traffic volume (AADT) | 9,605 | #6 of 46 |
| Highway vehicle-miles per day | 2,007,909 | #13 of 43 |
| Truck share on highways | 11.1% | #33 of 43 |
| Highway trucks per day | 2,214 | #18 of 43 |
| Average travel time | 32.4 min | #39 of 46 |
| Average driver income | $84,863 | #4 of 46 |
| Average driver age | 43.6 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.
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.
Mark Clark Expressway is one of the more congested roads here: trips take 64% longer than at free-flow speed, against 25% county-wide.
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%.
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%.
Delays build on US 52: its congestion ratio of 54% over free-flow time is well above the county's 25%.
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%).
US 17 Alt / US 52 carries 3.6 times the county average on its busiest stretch, where the median trip lasts 30.5 minutes.
The average monitored road in Berkeley carries 9,605 vehicles per day, 36% more than the South Carolina average of 7,040.
Berkeley carries more traffic than 89% of counties in South Carolina, averaging 9,605 vehicles per day.
Approximately 16% of highway traffic and 17% of non-highway traffic consists of vehicles whose trip originates outside Berkeley County, South Carolina. Even highway traffic is mostly local, so these roads mainly serve residents and commuters.
Trucks make up about 7.6% of all traffic in Berkeley County, South Carolina, rising to 11.1% on highways, where long-haul freight concentrates.
Weekday traffic has two busy windows: AM peak 7:00 AM–9:00 AM and PM peak 4:00 PM–6:00 PM - about 74% above the daily average.
Drivers on Berkeley roads have a median age of 44 years, younger than the South Carolina average of 46, and the median household income of the neighborhoods trips originate from averages $84,863, 15% above the South Carolina average.
The average trip in Berkeley takes 32.4 minutes, about the same as the South Carolina average, delays at signals and congestion included.
Mark Clark Expressway carries the most, 68,810 vehicles per day on its busiest stretch, followed by I 26 (57,490), Main Street (41,748), US 52 (37,681), Live Oak Drive (35,750). Figures are AADT, both directions combined.
Mark Clark Expressway, with about 8,236 trucks per day on its busiest stretch, 12.0% of its 68,810 vehicles.
About 68,810 vehicles per day in both directions on its busiest stretch, including 8,236 trucks (12.0%). Traffic is lower on its quieter stretches; TrafficZoom shows the count for every segment.

Mobile device location data (anonymized and aggregated)

Road sensor networks and traffic counters

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