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Traffic heat map of Brazoria County, Texas: 1,417 miles of roads shaded from blue (light) to red (heavy traffic), busiest on South Freeway

Brazoria County, Texas Traffic Counts

How busy are the roads of Brazoria County, Texas? We measure 1,417 road miles, divided into 28,286 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, South Freeway, carries 74,285 vehicles a day, 13.6 times the average road. 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 icon

Total Traffic Volume & Performance in Brazoria County, Texas

Traffic

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

vehicles per day5,477
Trucks

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

6.9%
Average travel time

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

32.1 min
Congestion ratio

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

15.2%
Drivers’ average age

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

43.1 yrs
Drivers’ average income

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

$99,257

Our data shows 5,477 vehicles per day on the average road in Brazoria County, Texas, and 7,780,595 vehicle-miles traveled per day (≈2.8 billion per year) across its 1,417 miles of monitored roads. Trucks are a smaller part of the mix than across Texas: 6.9% against 9.8%.

Busier roads than 82% of counties in Texas

Brazoria sees 21% lower average daily traffic volume than the state average (5,477 vehicles per day against 6,895), suggesting less demand on each road - a factor worth weighing in site selection and logistics planning. Across the whole network, that travel is about 1.1% of Texas's statewide total. Brazoria carries more traffic than 82% of counties in Texas.

Journey times here (32.1 minutes on average) closely track the state level. On travel time, Brazoria runs shorter than 75% of counties in Texas.

The congestion ratio of 15.2% runs slightly lower than the state level (7% lower).

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Brazoria County, Texas

Trafficvehicles per day19,469
Trucks10.2%
Average travel time41.1 min
Congestion ratio40.8%
Drivers’ average age42.6 yrs
Drivers’ average income$97,540

Highways carry a smaller share of travel in Brazoria County, Texas, 24% of vehicle-miles; most driving happens on local roads. The average highway carries 19,469 vehicles per day, 266% more than the average non-highway road in the same area, which carries 5,313 vehicles per day.

Yet highways are only 7% of the road network, 100 miles in 328 segments, so each mile of them is 3.4 times as busy as the average road mile.

That is more highway travel volume than 84% of counties in Texas.

Lower highway truck share than 91% of counties in Texas

At 10.2%, highway truck share is 26% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 91% of counties in Texas. By raw truck volume, Brazoria carries more highway trucks than 66% of counties in Texas.

non-highway traffic icon

Non-highway Traffic in Brazoria County, Texas

Trafficvehicles per day5,313
Trucks5.9%
Average travel time31.9 min
Congestion ratio14.9%
Drivers’ average age43.2 yrs
Drivers’ average income$99,588

Most travel in Brazoria County, Texas happens on local roads, 76% of all vehicle-miles. On the average non-highway road, that comes to 5,313 vehicles per day.

Local roads also make up about 93% of the monitored road miles: 1,318 miles in 27,958 segments, together carrying 5,945,952 vehicle-miles traveled per day (≈2.2 billion per year). About 1 in 17 vehicles on non-highway roads is a truck (5.9%).

Drivers from higher-income areas than 94% of counties in Texas

Compared to highways, non-highway routes see 42% fewer trucks by share.

Non-highway congestion (14.9%) runs slightly lower than the state level (7% lower).

Brazoria's average driver income is higher than 94% of counties in Texas. 72% of counties in Texas have an older driver population than Brazoria.

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 74% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 22% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
Traffic is nearly flat through the year: even March–May, the busiest stretch, runs only +2% 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 Brazoria County, Texas, the peak hour concentrates about 7% of the day's traffic, and traffic stays steady through the year (+2% in high season).

Brazoria County vs. Texas Traffic Comparison

Brazoria County's biggest difference from the Texas average is its truck share, 29% below it. Its highway truck share is also 26% below.

MetricBrazoria CountyTexas averageDifference
Traffic5,4776,895-20.6%
Truck % (Total Traffic)6.9%9.8%-29.2%
Truck % (Highway)10.2%13.8%-25.7%
Avg. Travel Time32.1 min32.6 min-1.7%

How Brazoria County compares

Brazoria County against nearby counties

Set against the average of the 4 areas nearest to it, Brazoria County moves 24.5% of the total daily travel; it has the fourth busiest roads of the five. Smaller and quieter on both counts: a shorter network than the areas around it, carrying lighter traffic across it.

Brazoria County and the 4 nearest county-level areas by centroid distance, with the Texas average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Brazoria County5,4776.9%7,780,59532.1 min15.2%
Fort Bend County, Texas7,1085.5%12,825,63429.8 min16.0%
Galveston County, Texas8,9376.6%6,290,27832.0 min21.8%
Matagorda County, Texas3,7898.3%963,88036.0 min13.7%
Harris County, Texas10,0806.8%107,067,37733.1 min20.4%
Texas average6,8959.8%N/A32.6 min16.4%

Brazoria County ranked within Texas

Average driver income places Brazoria County #17 of 254 in Texas - the top quarter of the state.

Brazoria County ranked among 254 county-level areas in Texas (1 = highest); measures without data in every county rank a smaller field, down to 227.
MeasureBrazoria CountyTexas rank
Traffic volume (AADT)5,477#47 of 254
Highway vehicle-miles per day1,834,643#38 of 227
Truck share on highways10.2%#206 of 227
Highway trucks per day1,988#77 of 227
Average travel time32.1 min#192 of 254
Average driver income$99,257#17 of 254
Average driver age43.1 yrs#182 of 254

Brazoria County ranks #17 of 254 on average driver income but #206 of 227 on truck share on highways - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Brazoria County, Texas

On their busiest stretches, the three busiest roads in Brazoria County carry 60,468 vehicles a day on average, 11.0 times the typical road in the county (5,477).

South Freeway leads with 74,285 vehicles a day, 6,104 of them trucks (8.2%). It tops the truck ranking too, with the most trucks.

Freeway Frontage Road is busy with cars rather than freight: only 3.1% of its traffic is trucks, against 6.9% county-wide.

Trips using Nolan Ryan Expressway are long: a median of 42.0 minutes against 32.1 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1South FreewayMotorway · 74,285vehicles6,104trucks · 8.2%
Road class
Motorway
Congestion ratio
68.0%
Median trip time
39.9 min
Drivers’ median age
42.2 yrs
Drivers’ average income
$112,046

Delays build on South Freeway: its congestion ratio of 68% over free-flow time is well above the county's 15%.

2Nolan Ryan ExpresswayMotorway · 72,043vehicles5,874trucks · 8.2%
Road class
Motorway
Congestion ratio
102.8%
Median trip time
42.0 min
Drivers’ median age
42.3 yrs
Drivers’ average income
$109,665

Travel on Nolan Ryan Expressway's busiest stretch runs 103% over free-flow time, against 15% across the county, so expect slower peak hours.

3Freeway Frontage RoadSecondary road · 35,076vehicles1,087trucks · 3.1%
Road class
Secondary road
Congestion ratio
29.6%
Median trip time
35.0 min
Drivers’ median age
41.7 yrs
Drivers’ average income
$117,159

Freeway Frontage Road is a trunk route for the county, carrying 6.4 times the county average on its busiest stretch; trucks are 3.1% of it, below the county-wide 6.9%.

4Alvin Sugarland RoadPrimary road · 32,541vehicles1,764trucks · 5.4%
Road class
Primary road
Congestion ratio
20.0%
Median trip time
36.1 min
Drivers’ median age
42.5 yrs
Drivers’ average income
$113,952

Alvin Sugarland Road carries 5.9 times the county average at its busiest, 1,764 of them trucks (5.4%, below the county-wide 6.9%).

5Alvin BypassPrimary road · 30,025vehicles1,706trucks · 5.7%
Road class
Primary road
Congestion ratio
42.6%
Median trip time
33.1 min
Drivers’ median age
44.2 yrs
Drivers’ average income
$87,887

Alvin Bypass carries 5.5 times the county average on its busiest stretch, where the median trip lasts 33.1 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1South FreewayMotorway · #1 by traffic74,285vehicles6,104trucks · 8.2%
2Nolan Ryan ExpresswayMotorway · #2 by traffic72,043vehicles5,874trucks · 8.2%
3TX 6Primary road · 29,824vehicles1,819trucks · 6.1%
Road class
Primary road
Congestion ratio
36.4%
Median trip time
34.6 min
Drivers’ median age
42.7 yrs
Drivers’ average income
$104,376

At 5.4 times the county average, TX 6 draws drivers from neighborhoods averaging $104,376 in household income.

4TX 288Primary road · 20,266vehicles1,789trucks · 8.8%
Road class
Primary road
Congestion ratio
17.9%
Median trip time
30.8 min
Drivers’ median age
44.2 yrs
Drivers’ average income
$79,510

The busiest stretch of TX 288 carries 3.7 times the county average; trucks are 8.8% of it, above the county-wide 6.9%.

5Alvin Sugarland RoadPrimary road · #4 by traffic32,541vehicles1,764trucks · 5.4%
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

BrazoriaDepartment 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 Brazoria County

The same traffic breakdown for the areas closest to Brazoria County, Texas.

Need segment-level traffic data?

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