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Traffic heat map of Grayson County, Texas: 757 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Sam Rayburn Freeway

Grayson County, Texas Traffic Counts

Its busiest road, Sam Rayburn Freeway, carries 49,452 vehicles a day, 11.0 times the average road. This page breaks down traffic in Grayson County, Texas across 757 miles of monitored roads split into 13,138 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
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 Grayson County, Texas

Traffic

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

vehicles per day4,501
Trucks

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

9.8%
Average travel time

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

31.5 min
Congestion ratio

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

12.8%
Drivers’ average age

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

46.9 yrs
Drivers’ average income

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

$82,001

Our data shows 4,501 vehicles per day on the average road in Grayson County, Texas, and 4,293,979 vehicle-miles traveled per day (≈1.6 billion per year) across its 757 miles of monitored roads. Trucks are 9.8% of traffic, close to the 9.8% across Texas.

Shorter trips than 81% of counties in Texas

Grayson's average daily traffic volume is 35% lower than the state average - 4,501 vehicles per day against 6,895 - suggesting less traffic load per road - lighter roads for freight, but less passing trade for roadside retail. Network-wide, Grayson accounts for about 0.6% of Texas's statewide total of vehicle-miles. 73% of counties in Texas see less traffic than Grayson's 4,501 vehicles per day.

Journey times here (31.5 minutes on average) closely track the state level. On travel time, Grayson runs shorter than 81% of counties in Texas.

At 22% lower than the state level, the 12.8% congestion ratio signals smoother traffic flow - relevant for traffic control and delivery planning.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Grayson County, Texas

Trafficvehicles per day12,598
Trucks13.5%
Average travel time39.7 min
Congestion ratio23.2%
Drivers’ average age46.0 yrs
Drivers’ average income$80,463

Travel in Grayson County, Texas splits roughly evenly, with about half of it (48% of vehicle-miles) on highways. The average highway carries 12,598 vehicles per day, 208% more than the average non-highway road in the same area, which carries 4,094 vehicles per day.

Highways make up 19% of the monitored road miles (146 miles, 629 segments), so they carry more than their share: 2,059,892 vehicle-miles traveled per day (≈752 million per year).

That is more highway travel volume than 86% of counties in Texas.

More highway trucks than 68% of counties in Texas

The concentration of trucks on highways (13.5%) is in line with the state average for similar road classifications. The highway traffic mix is typical for Texas: neither freight- nor commuter-dominated.

62% of counties in Texas see a higher highway truck share than Grayson's 13.5%. By raw truck volume, Grayson carries more highway trucks than 68% of counties in Texas.

non-highway traffic icon

Non-highway Traffic in Grayson County, Texas

Trafficvehicles per day4,094
Trucks6.5%
Average travel time31.1 min
Congestion ratio12.3%
Drivers’ average age47.5 yrs
Drivers’ average income$83,012

Travel in Grayson County, Texas splits roughly evenly, with about half of it (52% of vehicle-miles) on local roads. On the average non-highway road, that comes to 4,094 vehicles per day.

Local roads make up 81% of the monitored road miles (611 miles in 12,509 segments) but carry less than their share of travel: 2,234,087 vehicle-miles traveled per day (≈815 million per year). Trucks make up 6.5% of non-highway traffic, about 1 in 15 vehicles.

Drivers from higher-income areas than 82% of counties in Texas

Compared to highways, non-highway routes see 52% fewer trucks by share.

At 23% lower than the state level, the non-highway congestion ratio of 12.3% signals easier movement on local roads.

82% of counties in Texas see lower average driver income among trip origins than Grayson. 62% of counties in Texas have a younger driver population than Grayson.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–8:00 AM and PM peak 4:00 PM–7:00 PM, with volumes reaching approximately 75% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 14% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
May–July is the high season, with volumes +9% versus the annual average.
Lowest month:
January is the quietest month, with volumes -15% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Grayson County, Texas, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +9% in high season.

Grayson County vs. Texas Traffic Comparison

Grayson County's biggest difference from the Texas average is its average daily traffic per road, 35% below it. The other measures stay close to the average.

MetricGrayson CountyTexas averageDifference
Traffic4,5016,895-34.7%
Truck % (Total Traffic)9.8%9.8%+0.8%
Truck % (Highway)13.5%13.8%-1.9%
Avg. Travel Time31.5 min32.6 min-3.4%

How Grayson County compares

Grayson County against nearby counties

Grayson 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. The same kind of road, just less of it: traffic per road matches the areas around it while the network itself is smaller.

Grayson 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
Grayson County4,5019.8%4,293,97931.5 min12.8%
Collin County, Texas7,4875.6%23,071,55130.7 min16.3%
Marshall County, Oklahoma3,7848.5%417,84332.9 min10.1%
Fannin County, Texas2,6639.5%1,058,76431.6 min8.4%
Cooke County, Texas3,50820.0%1,990,15032.7 min12.3%
Texas average6,8959.8%N/A32.6 min16.4%

Grayson County ranked within Texas

Highway travel volume places Grayson County #32 of 227 in Texas - the top quarter of the state.

Grayson County ranked among 254 county-level areas in Texas (1 = highest); measures without data in every county rank a smaller field, down to 227.
MeasureGrayson CountyTexas rank
Traffic volume (AADT)4,501#69 of 254
Highway vehicle-miles per day2,059,892#32 of 227
Truck share on highways13.5%#141 of 227
Highway trucks per day1,700#74 of 227
Average travel time31.5 min#207 of 254
Average driver income$82,001#46 of 254
Average driver age46.9 yrs#96 of 254

The two ends of this table sit far apart: #32 of 227 on highway travel volume, against #207 of 254 on average travel time.

Busiest roads in Grayson County, Texas

Traffic concentrates on a few corridors: the three busiest roads average 45,960 vehicles a day, against 4,501 on the average road in Grayson County.

Sam Rayburn Freeway leads with 49,452 vehicles a day, 8,309 of them trucks (16.8%). Henry Hynds Expressway carries the most trucks, 8,722 a day (18.7% of its traffic), although it ranks #2 for all traffic.

Trucks make up 18.7% of traffic on Henry Hynds Expressway and 18.1% on Collins Freeway, against 9.8% across all roads in the county.

Trips using US 75 are long: a median of 46.0 minutes against 31.5 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Sam Rayburn FreewayMotorway · 49,452vehicles8,309trucks · 16.8%
Road class
Motorway
Congestion ratio
59.4%
Median trip time
42.4 min
Drivers’ median age
44.7 yrs
Drivers’ average income
$88,064

Delays build on Sam Rayburn Freeway: its congestion ratio of 59% over free-flow time is well above the county's 13%.

2Henry Hynds ExpresswayMotorway · 46,551vehicles8,722trucks · 18.7%
Road class
Motorway
Median trip time
45.6 min
Drivers’ median age
43.9 yrs
Drivers’ average income
$98,594

Henry Hynds Expressway carries through traffic: the median trip using it lasts 45.6 minutes, against 31.5 for the county.

3Collins FreewayMotorway · 41,877vehicles7,578trucks · 18.1%
Road class
Motorway
Congestion ratio
40.5%
Median trip time
45.4 min
Drivers’ median age
44.2 yrs
Drivers’ average income
$90,156

Travel on Collins Freeway's busiest stretch runs 41% over free-flow time, against 13% across the county, so expect slower peak hours.

4US 75Motorway · 39,522vehicles6,925trucks · 17.5%
Road class
Motorway
Congestion ratio
36.9%
Median trip time
46.0 min
Drivers’ median age
43.9 yrs
Drivers’ average income
$92,633

Trucks make up 17.5% of US 75's traffic, against 9.8% across the county, so freight weighs heavily here.

5Katy Memorial ExpresswayMotorway · 33,363vehicles5,272trucks · 15.8%
Road class
Motorway
Congestion ratio
39.7%
Median trip time
38.4 min
Drivers’ median age
46.3 yrs
Drivers’ average income
$73,014

Katy Memorial Expressway carries 7.4 times the county average on its busiest stretch, where the median trip lasts 38.4 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Henry Hynds ExpresswayMotorway · #2 by traffic46,551vehicles8,722trucks · 18.7%
2Sam Rayburn FreewayMotorway · #1 by traffic49,452vehicles8,309trucks · 16.8%
3Collins FreewayMotorway · #3 by traffic41,877vehicles7,578trucks · 18.1%
4US 75Motorway · #4 by traffic39,522vehicles6,925trucks · 17.5%
5Katy Memorial ExpresswayMotorway · #5 by traffic33,363vehicles5,272trucks · 15.8%
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

GraysonDepartment 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 Grayson County

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

Need segment-level traffic data?

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