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Traffic heat map of Stanislaus County, California: 1,059 miles of roads shaded from blue (light) to red (heavy traffic), busiest on CA 99 and Briggsmore Avenue

Stanislaus County, California Traffic Counts

How busy are the roads of Stanislaus County, California? We measure 1,059 road miles, divided into 21,255 segments, with multi-sourced, cross-verified mobile and sensor data. Its average highway carries more trucks than in any other county in California, about 6,315 a day. 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 Stanislaus County, California

Traffic

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

vehicles per day10,302
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.

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.

27.2%
Drivers’ average age

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

43.2 yrs
Drivers’ average income

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

$88,730

A typical monitored road in Stanislaus County, California sees 10,302 vehicles per day, while its 1,059 miles of monitored roads together handle 11,775,215 vehicle-miles traveled per day (≈4.3 billion per year). Trucks are 9.8% of traffic, more than the 7.8% across California.

Busier roads than 77% of counties in California

At 10,302 vehicles per day, the average monitored road in Stanislaus carries 19% less traffic than the state average of 12,766, suggesting less demand on each road - a factor worth weighing in site selection and logistics planning. Network-wide, Stanislaus accounts for about 1.3% of California's statewide total of vehicle-miles. 77% of counties in California see less traffic than Stanislaus's 10,302 vehicles per day.

At 33.1 minutes, the average travel time matches the state level closely. 60% of counties in California have a longer average travel time than Stanislaus's 33.1 minutes.

At 27.2%, the congestion ratio matches the state level closely.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Stanislaus County, California

Trafficvehicles per day31,476
Trucks16.1%
Average travel time42.8 min
Congestion ratio60.0%
Drivers’ average age42.4 yrs
Drivers’ average income$89,293

Highways carry a significant share of travel in Stanislaus County, California: 41% of all vehicle-miles. The average highway carries 31,476 vehicles per day, 220% more than the average non-highway road in the same area, which carries 9,845 vehicles per day.

Yet highways are only 12% of the road network, 124 miles in 449 segments, so each mile of them is 3.5 times as busy as the average road mile.

63% of counties in California move less traffic on their highways.

The most highway trucks of any county in California

At 16.1%, highway truck share is 55% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

75% of counties in California see a lower highway truck share than Stanislaus's 16.1%. Stanislaus also moves the highest raw count of highway trucks in California, at roughly 6,315 per day.

non-highway traffic icon

Non-highway Traffic in Stanislaus County, California

Trafficvehicles per day9,845
Trucks5.4%
Average travel time32.9 min
Congestion ratio26.5%
Drivers’ average age43.5 yrs
Drivers’ average income$88,516

Local roads carry more than half of all travel in Stanislaus County, California (59% of vehicle-miles). On the average non-highway road, that comes to 9,845 vehicles per day.

Local roads make up 88% of the monitored road miles (935 miles in 20,806 segments) but carry less than their share of travel: 6,918,809 vehicle-miles traveled per day (≈2.5 billion per year). About 1 in 18 vehicles on non-highway roads is a truck (5.4%).

Younger drivers than 70% of counties in California

Compared to highways, non-highway routes see 66% fewer trucks by share.

Non-highway congestion here (26.5%) closely tracks the state average.

Stanislaus's average driver income is higher than 51% of counties in California. The driver population here skews younger than 70% of counties in California.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Stanislaus County, California, the peak hour concentrates about 7% of the day's traffic.

Stanislaus County vs. California Traffic Comparison

The highway truck share sets Stanislaus County apart: 55% above the California average. Its truck share is also 27% above.

MetricStanislaus CountyCalifornia averageDifference
Traffic10,30212,766-19.3%
Truck % (Total Traffic)9.8%7.8%+26.6%
Truck % (Highway)16.1%10.4%+55.2%
Avg. Travel Time33.1 min34.5 min-4.0%

How Stanislaus County compares

Stanislaus County against nearby counties

Compared with its 4 closest neighbours, Stanislaus County is 36.7% more congested; it has the second busiest roads of the five.

Stanislaus County and the 4 nearest county-level areas by centroid distance, with the California average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Stanislaus County10,3029.8%11,775,21533.1 min27.2%
Merced County, California5,64816.6%7,127,20635.9 min15.7%
San Joaquin County, California8,64111.7%20,111,41032.8 min23.3%
Calaveras County, California3,2266.8%907,92531.8 min13.2%
Santa Clara County, California13,3665.5%42,004,95132.0 min27.4%
California average12,7667.8%N/A34.5 min27.4%

Stanislaus County ranked within California

Stanislaus County posts the highest highway truck volume of any county-level area in California.

Stanislaus County ranked among 58 county-level areas in California (1 = highest); measures without data in every county rank a smaller field, down to 52.
MeasureStanislaus CountyCalifornia rank
Traffic volume (AADT)10,302#14 of 58
Highway vehicle-miles per day4,856,406#20 of 52
Truck share on highways16.1%#14 of 52
Highway trucks per day5,071#1 of 52
Average travel time33.1 min#35 of 58
Average driver income$88,730#29 of 58
Average driver age43.2 yrs#41 of 58

Busiest roads in Stanislaus County, California

Traffic concentrates on a few corridors: the three busiest roads average 72,286 vehicles a day, against 10,302 on the average road in Stanislaus County.

CA 99 leads with 125,381 vehicles a day, 15,224 of them trucks (12.1%). No other road comes close: Briggsmore Avenue, in second place, carries 47,237. It also carries the most trucks.

William Elton Brown Freeway carries longer journeys than most roads here, with a median trip of 80.1 minutes against 33.1 county-wide.

Trucks make up 28.1% of traffic on William Elton Brown Freeway and 26.6% on Side Freeway, against 9.8% across all roads in the county.

Drivers on William Elton Brown Freeway come from neighborhoods with an average household income of $148,723, 68% above the county average of $88,730.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1CA 99Motorway · 125,381vehicles15,224trucks · 12.1%
Road class
Motorway
Congestion ratio
90.2%
Median trip time
41.7 min
Drivers’ median age
42.4 yrs
Drivers’ average income
$87,949

Travel on CA 99's busiest stretch runs 90% over free-flow time, against 27% across the county, so expect slower peak hours.

2Briggsmore AvenuePrimary road · 47,237vehicles1,851trucks · 3.9%
Road class
Primary road
Congestion ratio
114.4%
Median trip time
31.9 min
Drivers’ median age
43.3 yrs
Drivers’ average income
$84,829

Briggsmore Avenue is one of the more congested roads here: trips take 114% longer than at free-flow speed, against 27% county-wide.

3Side FreewayMotorway · 44,240vehicles11,765trucks · 26.6%
Road class
Motorway
Congestion ratio
37.6%
Median trip time
62.8 min
Drivers’ median age
42.6 yrs
Drivers’ average income
$97,902

Side Freeway carries through traffic: the median trip using it lasts 62.8 minutes, against 33.1 for the county.

4Kiernan AvenuePrimary road · 41,945vehicles2,721trucks · 6.5%
Road class
Primary road
Congestion ratio
76.1%
Median trip time
30.0 min
Drivers’ median age
44.3 yrs
Drivers’ average income
$114,863

Kiernan Avenue carries 4.1 times the county average on its busiest stretch, where the median trip lasts 30.0 minutes.

5Claribel RoadSecondary road · 36,958vehicles1,602trucks · 4.3%
Road class
Secondary road
Congestion ratio
87.2%
Median trip time
30.6 min
Drivers’ median age
44.4 yrs
Drivers’ average income
$112,546

At 3.6 times the county average, Claribel Road draws drivers from neighborhoods averaging $112,546 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1CA 99Motorway · #1 by traffic125,381vehicles15,224trucks · 12.1%
2Side FreewayMotorway · #3 by traffic44,240vehicles11,765trucks · 26.6%
3William Elton Brown FreewayMotorway · 14,354vehicles4,032trucks · 28.1%
Road class
Motorway
Median trip time
80.1 min
Drivers’ median age
42.4 yrs
Drivers’ average income
$148,723

William Elton Brown Freeway carries 39% more than the county average at its busiest, 4,032 of them trucks (28.1%, above the county-wide 9.8%).

4Maze BoulevardTrunk road · 17,807vehicles2,938trucks · 16.5%
Road class
Trunk road
Congestion ratio
36.3%
Median trip time
40.4 min
Drivers’ median age
42.6 yrs
Drivers’ average income
$108,394

Maze Boulevard leans on freight: 2,938 trucks a day, 16.5% of its traffic against 9.8% county-wide.

5CA 132Trunk road · 18,344vehicles2,907trucks · 15.8%
Road class
Trunk road
Congestion ratio
41.8%
Median trip time
51.2 min
Drivers’ median age
42.2 yrs
Drivers’ average income
$114,416

Drivers on CA 132 are on long journeys, a median 51.2 minutes against 33.1 county-wide: a through route more than a local street.

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

StanislausDepartment 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 Stanislaus County

The same traffic breakdown for the areas closest to Stanislaus County, California.

Need segment-level traffic data?

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