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Traffic heat map of San Joaquin County, California: 1,624 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Robert T. Monagan Freeway

San Joaquin County, California Traffic Counts

TrafficZoom tracks traffic on 1,624 road miles in San Joaquin County, California, divided into 32,051 segments averaging 267 ft. Its highways rank among the top 3 counties in California for trucks per day. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 San Joaquin County, California

Traffic

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

vehicles per day8,641
Trucks

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

11.7%
Average travel time

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

32.8 min
Congestion ratio

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

23.3%
Drivers’ average age

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

43.0 yrs
Drivers’ average income

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

$106,425

A typical monitored road in San Joaquin County, California sees 8,641 vehicles per day, while its 1,624 miles of monitored roads together handle 20,111,410 vehicle-miles traveled per day (≈7.3 billion per year). At 11.7%, the truck share runs above the 7.8% across California: about 1 in 9 vehicles.

Traffic 32% below the California average

San Joaquin's average daily traffic volume is 32% lower than the state average - 8,641 vehicles per day against 12,766 - suggesting less traffic load per road - lighter roads for freight, but less passing trade for roadside retail. In total volume terms, its road network carries about 2.2% of California's statewide total of vehicle-miles. San Joaquin carries more traffic than 63% of counties in California.

At 32.8 minutes, the average travel time matches the state level closely. 65% of counties in California have a longer average travel time than San Joaquin's 32.8 minutes.

At 15% lower than the state level, the 23.3% 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 San Joaquin County, California

Trafficvehicles per day36,604
Trucks16.0%
Average travel time45.8 min
Congestion ratio65.6%
Drivers’ average age43.1 yrs
Drivers’ average income$109,779

Highways carry more than half of all travel in San Joaquin County, California (57% of vehicle-miles). The average highway carries 36,604 vehicles per day, 379% more than the average non-highway road in the same area, which carries 7,636 vehicles per day.

With 19% of the road miles (309 miles in 1,112 segments), highways punch above their length, carrying 11,412,144 vehicle-miles traveled per day (≈4.2 billion per year).

80% of counties in California move less traffic on their highways.

More highway trucks than 98% of counties in California

The concentration of trucks on highways (16.0%) is 55% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.

San Joaquin's highway truck share (16.0%) is higher than 73% of counties in California. 98% of counties in California see fewer highway trucks per day than San Joaquin's roughly 5,871.

non-highway traffic icon

Non-highway Traffic in San Joaquin County, California

Trafficvehicles per day7,636
Trucks5.9%
Average travel time32.4 min
Congestion ratio21.8%
Drivers’ average age42.9 yrs
Drivers’ average income$103,645

Local roads carry a significant share of travel in San Joaquin County, California: 43% of all vehicle-miles. On the average non-highway road, that comes to 7,636 vehicles per day.

Local roads make up 81% of the monitored road miles (1,314 miles in 30,939 segments) but carry less than their share of travel: 8,699,267 vehicle-miles traveled per day (≈3.2 billion per year). The truck share on non-highway roads is 5.9%.

Younger drivers than 75% of counties in California

Compared to highways, non-highway routes see 63% fewer trucks by share.

The non-highway congestion ratio of 21.8% is 18% lower than the state level, suggesting more efficient local mobility than the state average.

Trip origins here have higher average income than 70% of counties in California. 75% of counties in California have an older driver population than San Joaquin.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 7:00 AM to 12:00 PM and a long afternoon plateau from 3:00 PM to 9:00 PM, with volumes reaching approximately 68% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 20% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +5% versus the annual average.
Lowest month:
January is the quietest month, with volumes -12% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In San Joaquin County, California, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +5% in high season.

San Joaquin County vs. California Traffic Comparison

San Joaquin County's biggest difference from the California average is its highway truck share, 55% above it. Its truck share is also 50% above.

MetricSan Joaquin CountyCalifornia averageDifference
Traffic8,64112,766-32.3%
Truck % (Total Traffic)11.7%7.8%+49.9%
Truck % (Highway)16.0%10.4%+54.5%
Avg. Travel Time32.8 min34.5 min-4.8%

How San Joaquin County compares

San Joaquin County has a higher truck share than any nearby county

San Joaquin 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 fourth busiest roads of the five. Traffic volume here matches the areas around it, but more of that traffic is trucks - a difference in what routes through, not in how much.

San Joaquin 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
San Joaquin County8,64111.7%20,111,41032.8 min23.3%
Sacramento County, California11,8025.8%33,124,74633.3 min27.9%
Stanislaus County, California10,3029.8%11,775,21533.1 min27.2%
Calaveras County, California3,2266.8%907,92531.8 min13.2%
Contra Costa County, California11,9386.1%25,822,58330.6 min31.6%
California average12,7667.8%N/A34.5 min27.4%

San Joaquin County ranked within California

On highway truck volume, San Joaquin County is among the three highest county-level areas in California.

San Joaquin County ranked among 58 county-level areas in California (1 = highest); measures without data in every county rank a smaller field, down to 52.
MeasureSan Joaquin CountyCalifornia rank
Traffic volume (AADT)8,641#22 of 58
Highway vehicle-miles per day11,412,144#11 of 52
Truck share on highways16.0%#15 of 52
Highway trucks per day5,871#2 of 52
Average travel time32.8 min#38 of 58
Average driver income$106,425#18 of 58
Average driver age43.0 yrs#44 of 58

San Joaquin County ranks #2 of 52 on highway truck volume but #44 of 58 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in San Joaquin County, California

Traffic concentrates on a few corridors: the three busiest roads average 120,223 vehicles a day, against 8,641 on the average road in San Joaquin County.

Robert T. Monagan Freeway leads with 131,576 vehicles a day, 18,599 of them trucks (14.1%). It also carries the most trucks.

Trips using Robert T. Monagan Freeway are long: a median of 52.3 minutes against 32.8 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Robert T. Monagan FreewayMotorway · 131,576vehicles18,599trucks · 14.1%
Road class
Motorway
Congestion ratio
104.4%
Median trip time
52.3 min
Drivers’ median age
43.1 yrs
Drivers’ average income
$130,965

Robert T. Monagan Freeway is a trunk route for the county, carrying 15.2 times the county average on its busiest stretch; trucks are 14.1% of it, above the county-wide 11.7%.

2CA 99Motorway · 117,816vehicles15,588trucks · 13.2%
Road class
Motorway
Congestion ratio
78.2%
Median trip time
40.7 min
Drivers’ median age
43.2 yrs
Drivers’ average income
$103,988

CA 99 carries 13.6 times the county average at its busiest, 15,588 of them trucks (13.2%, above the county-wide 11.7%).

3CA 99 / CA 4Motorway · 111,277vehicles16,472trucks · 14.8%
Road class
Motorway
Congestion ratio
120.1%
Median trip time
45.4 min
Drivers’ median age
43.6 yrs
Drivers’ average income
$91,000

Delays build on CA 99 / CA 4: its congestion ratio of 120% over free-flow time is well above the county's 23%.

4CA 99 / CA 12Motorway · 102,358vehicles16,564trucks · 16.2%
Road class
Motorway
Congestion ratio
116.6%
Median trip time
47.6 min
Drivers’ median age
44.5 yrs
Drivers’ average income
$98,139

Travel on CA 99 / CA 12's busiest stretch runs 117% over free-flow time, against 23% across the county, so expect slower peak hours.

5Sacramento FreewayMotorway · 73,910vehicles11,827trucks · 16.0%
Road class
Motorway
Congestion ratio
88.9%
Median trip time
46.6 min
Drivers’ median age
45.1 yrs
Drivers’ average income
$109,305

Sacramento Freeway carries through traffic: the median trip using it lasts 46.6 minutes, against 32.8 for the county.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Robert T. Monagan FreewayMotorway · #1 by traffic131,576vehicles18,599trucks · 14.1%
2CA 99 / CA 12Motorway · #4 by traffic102,358vehicles16,564trucks · 16.2%
3CA 99 / CA 4Motorway · #3 by traffic111,277vehicles16,472trucks · 14.8%
4CA 99Motorway · #2 by traffic117,816vehicles15,588trucks · 13.2%
5Side FreewayMotorway · 73,463vehicles12,655trucks · 17.2%
Road class
Motorway
Congestion ratio
74.8%
Median trip time
44.6 min
Drivers’ median age
42.8 yrs
Drivers’ average income
$105,935

Side Freeway carries 8.5 times the county average on its busiest stretch, where the median trip lasts 44.6 minutes.

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

San JoaquinDepartment 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 San Joaquin County

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

Need segment-level traffic data?

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