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Traffic heat map of Cobb County, Georgia: 1,076 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Larry McDonald Memorial Highway

Cobb County, Georgia Traffic Counts

How busy are the roads of Cobb County, Georgia? We measure 1,076 road miles, divided into 34,478 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 Cobb County, Georgia

Traffic

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

vehicles per day12,142
Trucks

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

6.6%
Average travel time

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

33.1 min
Congestion ratio

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

23.2%
Drivers’ average age

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

43.4 yrs
Drivers’ average income

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

$113,864

A typical monitored road in Cobb County, Georgia sees 12,142 vehicles per day, while its 1,076 miles of monitored roads together handle 16,509,931 vehicle-miles traveled per day (≈6.0 billion per year). About 1 in 15 vehicles is a truck, fewer than the 1 in 10 across Georgia.

Busier roads than 99% of counties in Georgia

Cobb's average daily traffic volume is 64% higher than the state average - 12,142 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 5.9% of Georgia's statewide total. By volume, Cobb's 12,142 vehicles per day outpaces 99% of counties in Georgia.

At 33.1 minutes, the average travel time matches the state level closely. On travel time, Cobb runs shorter than 52% of counties in Georgia.

The congestion ratio of 23.2% is 38% higher, pointing to more pronounced congestion than the state level - expect slower peak-hour deliveries and less predictable arrival times.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Cobb County, Georgia

Trafficvehicles per day28,874
Trucks9.9%
Average travel time42.2 min
Congestion ratio46.5%
Drivers’ average age43.6 yrs
Drivers’ average income$106,103

Highways carry a significant share of travel in Cobb County, Georgia: 43% of all vehicle-miles. The average highway carries 28,874 vehicles per day, 157% more than the average non-highway road in the same area, which carries 11,216 vehicles per day.

With 17% of the road miles (181 miles in 1,809 segments), highways punch above their length, carrying 7,147,340 vehicle-miles traveled per day (≈2.6 billion per year).

No more than 4 other counties in Georgia move more traffic on their highways.

More highway trucks than 86% of counties in Georgia

The concentration of trucks on highways (9.9%) is 27% 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 77% of counties in Georgia. 86% of counties in Georgia see fewer highway trucks per day than Cobb's roughly 2,858.

non-highway traffic icon

Non-highway Traffic in Cobb County, Georgia

Trafficvehicles per day11,216
Trucks4.0%
Average travel time32.6 min
Congestion ratio21.9%
Drivers’ average age43.2 yrs
Drivers’ average income$118,380

Local roads carry more than half of all travel in Cobb County, Georgia (57% of vehicle-miles). A typical local road sees 11,216 vehicles per day.

Spread over 895 miles and 32,669 segments, 83% of the road network, local roads carry a lighter load per mile: 9,362,591 vehicle-miles traveled per day (≈3.4 billion per year). The truck share on non-highway roads is 4.0%.

Drivers from higher-income areas than 98% of counties in Georgia

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

The non-highway congestion ratio of 21.9% is 35% higher than the state level, suggesting slower local mobility than the state average.

Cobb's average driver income is higher than 98% of counties in Georgia. The driver population here skews younger than 91% 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–6:00 PM, with volumes reaching approximately 71% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 15% 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 -7% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

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

Cobb County vs. Georgia Traffic Comparison

The average daily traffic per road sets Cobb County apart: 64% above the Georgia average. Its truck share, by contrast, is 32% below.

MetricCobb CountyGeorgia averageDifference
Traffic12,1427,398+64.1%
Truck % (Total Traffic)6.6%9.7%-32.2%
Truck % (Highway)9.9%13.6%-27.0%
Avg. Travel Time33.1 min33.6 min-1.2%

How Cobb County compares

Cobb County against nearby counties

Cobb County tracks the 4 areas around it closely - no measure in this table sets it far apart from the areas immediately next to it, though it has the second busiest roads of the five.

Cobb 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
Cobb County12,1426.6%16,509,93133.1 min23.2%
Fulton County, Georgia11,9628.1%29,964,02936.2 min22.1%
Paulding County, Georgia8,8934.7%2,319,22431.7 min22.5%
DeKalb County, Georgia14,1777.9%17,970,15834.7 min27.0%
Douglas County, Georgia8,66910.6%3,749,84331.6 min22.4%
Georgia average7,3989.7%N/A33.6 min16.8%

Cobb County ranked within Georgia

On average daily traffic volume, Cobb County is among the three highest county-level areas in Georgia.

Cobb County ranked among 159 county-level areas in Georgia (1 = highest); measures without data in every county rank a smaller field, down to 147.
MeasureCobb CountyGeorgia rank
Traffic volume (AADT)12,142#3 of 159
Highway vehicle-miles per day7,147,340#4 of 147
Truck share on highways9.9%#114 of 147
Highway trucks per day2,858#22 of 147
Average travel time33.1 min#83 of 159
Average driver income$113,864#4 of 159
Average driver age43.4 yrs#145 of 159

Cobb County ranks #3 of 159 on average daily traffic volume but #145 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 Cobb County, Georgia

Traffic concentrates on a few corridors: the three busiest roads average 150,538 vehicles a day, against 12,142 on the average road in Cobb County.

Larry McDonald Memorial Highway is the busiest road, at 169,145 vehicles a day, 17,968 of them trucks (10.6%). Tom Murphy Freeway carries the most trucks, 19,735 a day (15.6% of its traffic), although it ranks #3 for all traffic.

Freight stands out on I 75 and Tom Murphy Freeway: trucks are 16.8% and 15.6% of the traffic there, against 6.6% county-wide.

Trips using I 75 are long: a median of 48.2 minutes against 33.1 county-wide, the mark of a through route.

Tom Murphy Freeway draws drivers from lower-income areas: their neighborhoods average $84,342 in household income, 26% below the county's $113,864.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Larry McDonald Memorial HighwayMotorway · 169,145vehicles17,968trucks · 10.6%
Road class
Motorway
Congestion ratio
79.8%
Median trip time
45.7 min
Drivers’ median age
43.3 yrs
Drivers’ average income
$101,120

A main artery: Larry McDonald Memorial Highway's busiest stretch carries 13.9 times the county average; trucks are 10.6% of it, above the county-wide 6.6%.

2PerimeterMotorway · 155,620vehicles17,216trucks · 11.1%
Road class
Motorway
Congestion ratio
74.4%
Median trip time
46.2 min
Drivers’ median age
43.1 yrs
Drivers’ average income
$106,541

Drivers on Perimeter are on long journeys, a median 46.2 minutes against 33.1 county-wide: a through route more than a local street.

3Tom Murphy FreewayMotorway · 126,850vehicles19,735trucks · 15.6%
Road class
Motorway
Congestion ratio
79.2%
Median trip time
47.2 min
Drivers’ median age
42.4 yrs
Drivers’ average income
$84,342

Tom Murphy Freeway carries through traffic: the median trip using it lasts 47.2 minutes, against 33.1 for the county.

4I 75Motorway · 110,596vehicles18,523trucks · 16.8%
Road class
Motorway
Congestion ratio
80.8%
Median trip time
48.2 min
Drivers’ median age
43.3 yrs
Drivers’ average income
$91,029

Delays build on I 75: its congestion ratio of 81% over free-flow time is well above the county's 23%.

5Phillip Landrum Memorial HighwayMotorway · 69,497vehicles6,208trucks · 8.9%
Road class
Motorway
Congestion ratio
80.7%
Median trip time
36.5 min
Drivers’ median age
44.7 yrs
Drivers’ average income
$106,790

Travel on Phillip Landrum Memorial Highway's busiest stretch runs 81% over free-flow time, against 23% across the county, so expect slower peak hours.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Tom Murphy FreewayMotorway · #3 by traffic126,850vehicles19,735trucks · 15.6%
2I 75Motorway · #4 by traffic110,596vehicles18,523trucks · 16.8%
3Larry McDonald Memorial HighwayMotorway · #1 by traffic169,145vehicles17,968trucks · 10.6%
4PerimeterMotorway · #2 by traffic155,620vehicles17,216trucks · 11.1%
5Phillip Landrum Memorial HighwayMotorway · #5 by traffic69,497vehicles6,208trucks · 8.9%
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

CobbDepartment 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 Cobb County

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

Need segment-level traffic data?

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