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Traffic heat map of Gwinnett County, Georgia: 1,227 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 85 and Stone Mountain Freeway

Gwinnett County, Georgia Traffic Counts

How busy are the roads of Gwinnett County, Georgia? We measure 1,227 road miles, divided into 35,652 segments, with multi-sourced, cross-verified mobile and sensor data. It ranks among the top 3 counties in Georgia for average daily traffic. 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 Gwinnett County, Georgia

Traffic

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

vehicles per day12,642
Trucks

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

6.8%
Average travel time

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

34.2 min
Congestion ratio

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

26.8%
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.

$102,968

The average monitored road in Gwinnett County, Georgia carries 12,642 vehicles per day. Across its 1,227 miles of monitored roads, that adds up to 19,215,872 vehicle-miles traveled per day (≈7.0 billion per year). Trucks are a smaller part of the mix than across Georgia: 6.8% against 9.7%.

Busier roads than 99% of counties in Georgia

Gwinnett's average daily traffic volume is 71% higher than the state average - 12,642 vehicles per day against 7,398 - suggesting more traffic load per road - prime passing trade for storefronts, with more competition for road space. Across the whole network, that travel is about 6.9% of Georgia's statewide total. By volume, Gwinnett's 12,642 vehicles per day outpaces 99% of counties in Georgia.

At 34.2 minutes, the average travel time matches the state level closely. On travel time, Gwinnett runs longer than 59% of counties in Georgia.

Congestion runs 59% higher than the state level, at a ratio of 26.8%, which means more pronounced congestion - expect markedly slower peak-hour deliveries and unreliable arrival times.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Gwinnett County, Georgia

Trafficvehicles per day27,601
Trucks9.4%
Average travel time37.8 min
Congestion ratio46.5%
Drivers’ average age43.7 yrs
Drivers’ average income$101,174

Travel in Gwinnett County, Georgia splits roughly evenly, with about half of it (50% of vehicle-miles) on highways. The average highway carries 27,601 vehicles per day, 152% more than the average non-highway road in the same area, which carries 10,944 vehicles per day.

With 24% of the road miles (293 miles in 3,634 segments), highways punch above their length, carrying 9,650,741 vehicle-miles traveled per day (≈3.5 billion per year).

That puts Gwinnett among the top 3 counties in Georgia for highway travel volume.

Lower highway truck share than 82% of counties in Georgia

The concentration of trucks on highways (9.4%) is 30% 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 82% of counties in Georgia. 78% of counties in Georgia see fewer highway trucks per day than Gwinnett's roughly 2,606.

non-highway traffic icon

Non-highway Traffic in Gwinnett County, Georgia

Trafficvehicles per day10,944
Trucks4.1%
Average travel time33.8 min
Congestion ratio24.6%
Drivers’ average age43.5 yrs
Drivers’ average income$104,473

Travel in Gwinnett County, Georgia splits roughly evenly, with about half of it (50% of vehicle-miles) on local roads. A typical local road sees 10,944 vehicles per day.

Spread over 935 miles and 32,018 segments, 76% of the road network, local roads carry a lighter load per mile: 9,565,131 vehicle-miles traveled per day (≈3.5 billion per year). About 1 in 24 vehicles on non-highway roads is a truck (4.1%).

Drivers from higher-income areas than 96% of counties in Georgia

Compared to highways, non-highway routes see 56% fewer trucks by share.

At 52% higher than the state level, the non-highway congestion ratio of 24.6% signals more friction on local roads.

Gwinnett's average driver income is higher than 96% of counties in Georgia. Gwinnett's median driver age is lower than 89% of counties in Georgia.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–9:00 AM and PM peak 4:00 PM–7:00 PM, with volumes reaching approximately 68% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 11% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
Traffic is nearly flat through the year: even August–October, the busiest stretch, runs only +3% versus the annual average.
Lowest month:
January is the quietest month, with volumes -6% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Gwinnett County, Georgia, the peak hour concentrates about 7% of the day's traffic, and traffic stays steady through the year (+3% in high season).

Gwinnett County vs. Georgia Traffic Comparison

The average daily traffic per road sets Gwinnett County apart: 71% above the Georgia average. Its highway truck share, by contrast, is 30% below.

MetricGwinnett CountyGeorgia averageDifference
Traffic12,6427,398+70.9%
Truck % (Total Traffic)6.8%9.7%-29.8%
Truck % (Highway)9.4%13.6%-30.4%
Avg. Travel Time34.2 min33.6 min+1.9%

How Gwinnett County compares

Gwinnett County against nearby counties

Against the 4 nearest areas, Gwinnett County moves 2.8 times the total daily travel; it has the second busiest roads of the five. Bigger and busier at once: more road than the areas around it and heavier traffic on it, which makes it the centre of gravity for travel in this part of the map.

Gwinnett County and the 4 nearest county-level areas by centroid distance, with the Georgia average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Gwinnett County12,6426.8%19,215,87234.2 min26.8%
DeKalb County, Georgia14,1777.9%17,970,15834.7 min27.0%
Forsyth County, Georgia7,7315.3%4,444,64230.5 min18.8%
Rockdale County, Georgia7,2708.9%2,575,90432.4 min18.4%
Barrow County, Georgia8,0879.2%2,284,97832.8 min19.5%
Georgia average7,3989.7%N/A33.6 min16.8%

Gwinnett County ranked within Georgia

On average daily traffic volume and highway travel volume, Gwinnett County is among the three highest county-level areas in Georgia.

Gwinnett County ranked among 159 county-level areas in Georgia (1 = highest); measures without data in every county rank a smaller field, down to 147.
MeasureGwinnett CountyGeorgia rank
Traffic volume (AADT)12,642#2 of 159
Highway vehicle-miles per day9,650,741#3 of 147
Truck share on highways9.4%#121 of 147
Highway trucks per day2,606#33 of 147
Average travel time34.2 min#65 of 159
Average driver income$102,968#7 of 159
Average driver age43.6 yrs#142 of 159

Gwinnett County ranks #2 of 159 on average daily traffic volume but #142 of 159 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Gwinnett County, Georgia

The three busiest roads in Gwinnett County average 114,667 vehicles a day, 9.1 times the county average of 12,642 across all its monitored roads.

I 85 leads with 169,062 vehicles a day, 18,178 of them trucks (10.8%). No other road comes close: Stone Mountain Freeway, in second place, carries 89,986. It tops the truck ranking too, with the most trucks.

Trucks make up 15.1% of traffic on I-85 Express Lanes Extension and 14.3% on Lanier Parkway, against 6.8% across all roads in the county.

Trips using I 85 are long: a median of 47.4 minutes against 34.2 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 85Motorway · 169,062vehicles18,178trucks · 10.8%
Road class
Motorway
Congestion ratio
83.2%
Median trip time
47.4 min
Drivers’ median age
42.6 yrs
Drivers’ average income
$96,513

I 85 is one of the more congested roads here: trips take 83% longer than at free-flow speed, against 27% county-wide.

2Stone Mountain FreewayMotorway · 89,986vehicles6,207trucks · 6.9%
Road class
Motorway
Congestion ratio
64.2%
Median trip time
36.2 min
Drivers’ median age
43.8 yrs
Drivers’ average income
$93,099

At 7.1 times the county average, Stone Mountain Freeway draws drivers from neighborhoods averaging $93,099 in household income.

3University ParkwayMotorway · 84,951vehicles10,388trucks · 12.2%
Road class
Motorway
Congestion ratio
88.2%
Median trip time
42.4 min
Drivers’ median age
41.6 yrs
Drivers’ average income
$91,653

Delays build on University Parkway: its congestion ratio of 88% over free-flow time is well above the county's 27%.

4I-85 Express Lanes ExtensionMotorway · 77,729vehicles11,699trucks · 15.1%
Road class
Motorway
Congestion ratio
33.2%
Median trip time
45.1 min
Drivers’ median age
43.5 yrs
Drivers’ average income
$106,829

Drivers on I-85 Express Lanes Extension are on long journeys, a median 45.1 minutes against 34.2 county-wide: a through route more than a local street.

5Peachtree Industrial BoulevardMotorway · 71,723vehicles5,304trucks · 7.4%
Road class
Motorway
Congestion ratio
57.7%
Median trip time
34.7 min
Drivers’ median age
43.3 yrs
Drivers’ average income
$126,447

A main artery: Peachtree Industrial Boulevard's busiest stretch carries 5.7 times the county average; trucks are 7.4% of it, above the county-wide 6.8%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 85Motorway · #1 by traffic169,062vehicles18,178trucks · 10.8%
2I-85 Express Lanes ExtensionMotorway · #4 by traffic77,729vehicles11,699trucks · 15.1%
3University ParkwayMotorway · #3 by traffic84,951vehicles10,388trucks · 12.2%
4Lanier ParkwayMotorway · 66,842vehicles9,590trucks · 14.3%
Road class
Motorway
Congestion ratio
81.3%
Median trip time
40.9 min
Drivers’ median age
44.2 yrs
Drivers’ average income
$92,698

Lanier Parkway is a trunk route for the county, carrying 5.3 times the county average on its busiest stretch; trucks are 14.3% of it, above the county-wide 6.8%.

5Stone Mountain FreewayMotorway · #2 by traffic89,986vehicles6,207trucks · 6.9%
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

GwinnettDepartment 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 Gwinnett County

The same traffic breakdown for the areas closest to Gwinnett County, Georgia.

Need segment-level traffic data?

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