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Traffic heat map of California: roads over 1,000 vehicles a day shaded from blue (light) to red (heavy traffic), busiest on Tuskegee Airmen Highway

California Traffic Counts

Our California traffic data covers 1,457,402 road segments over 66,735 road miles, with an average segment of just 242 ft. It has the busiest roads of any state nationwide, averaging 12,766 vehicles a day. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
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 California

Traffic

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

vehicles per day12,766
Trucks

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

7.8%
Average travel time

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

34.5 min
Congestion ratio

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

27.4%
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.

$111,276

A typical monitored road in California sees 12,766 vehicles per day, while its 66,735 miles of monitored roads together handle 927,539,301 vehicle-miles traveled per day (≈339 billion per year). About 1 in 13 vehicles is a truck, fewer than the 1 in 11 across the US.

The busiest roads of any state nationwide

California's average daily traffic volume is 83% higher than the national average - 12,766 vehicles per day against 6,986 - suggesting more traffic load per road - prime passing trade for storefronts, with more competition for road space. Network-wide, California accounts for about 12% of the national total of vehicle-miles. California stands out as having the highest traffic volume nationwide - 12,766 vehicles per day.

At 34.5 minutes, the average travel time matches the national level closely. 83% of states nationwide have a shorter average travel time than California's 34.5 minutes.

Congestion runs 45% higher than the national level, at a ratio of 27.4%, which means more pronounced congestion - a factor for delivery windows and signal timing.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in California

Trafficvehicles per day37,794
Trucks10.4%
Average travel time41.0 min
Congestion ratio62.6%
Drivers’ average age43.2 yrs
Drivers’ average income$111,892

Travel in California splits roughly evenly, with about half of it (54% of vehicle-miles) on highways. The average highway carries 37,794 vehicles per day, 224% more than the average non-highway road in the same area, which carries 11,652 vehicles per day.

With 21% of the road miles (14,127 miles in 62,075 segments), highways punch above their length, carrying 498,012,863 vehicle-miles traveled per day (≈182 billion per year).

By highway travel volume, California ranks first nationwide.

The most highway trucks of any state nationwide

Highway truck concentration here runs 21% lower than the national average, at 10.4%. Trucks are a small share of a very large highway flow, so California still moves heavy freight volumes alongside its passenger traffic.

California's highway truck share (10.4%) is lower than 76% of states nationwide. By raw volume, California carries the highest number of highway trucks nationwide - roughly 3,659 trucks per day.

non-highway traffic icon

Non-highway Traffic in California

Trafficvehicles per day11,652
Trucks4.8%
Average travel time34.3 min
Congestion ratio26.5%
Drivers’ average age43.5 yrs
Drivers’ average income$110,743

Travel in California splits roughly evenly, with about half of it (46% of vehicle-miles) on local roads. On the average non-highway road, that comes to 11,652 vehicles per day.

Local roads make up 79% of the monitored road miles (52,608 miles in 1,395,327 segments) but carry less than their share of travel: 429,526,443 vehicle-miles traveled per day (≈157 billion per year). Trucks make up 4.8% of non-highway traffic, about 1 in 21 vehicles.

Drivers from higher-income areas than 90% of states nationwide

The concentration of trucks on non-highway roads is 54% lower than on highways.

The non-highway congestion ratio of 26.5% is 45% higher than the national level, suggesting slower local mobility than the national average.

90% of states nationwide see lower average driver income among trip origins than California. 88% of states nationwide have an older driver population than California.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–9:00 AM and a long afternoon plateau from 3:00 PM to 9:00 PM, with volumes reaching approximately 64% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 9% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
April–June is the high season, with volumes +5% versus the annual average.
Lowest month:
January is the quietest month, with volumes -8% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

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

California vs. United States Traffic Comparison

The average daily traffic per road sets California apart: 83% above the United States average. Its highway truck share, by contrast, is 21% below.

MetricCaliforniaUnited States averageDifference
Traffic12,7666,986+82.7%
Truck % (Total Traffic)7.8%9.3%-16.9%
Truck % (Highway)10.4%13.1%-20.6%
Avg. Travel Time34.5 min33.3 min+3.6%

How California compares

California moves more traffic than any nearby state

Against the 4 nearest states, California moves 10.0 times the total daily travel and is 51.2% more congested; it has the busiest roads of the five. It is where traffic concentrates in this corner of the map - the local bottleneck, with more vehicles per road AND less room to absorb them.

California and the 4 nearest states by centroid distance, with the United States average for scale.
StateAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
California12,7667.8%927,539,30134.5 min27.4%
Nevada7,9149.7%63,246,04333.8 min17.1%
Arizona10,0099.6%174,389,60332.9 min18.1%
Utah10,1988.9%87,040,46632.2 min21.2%
Idaho5,7349.7%45,169,44433.8 min16.0%
United States average6,9869.3%N/A33.3 min18.9%

Busiest counties in California

California's three busiest counties account for 38.9% of all the vehicle-miles measured in the state.

Ranked by daily vehicle-miles, across the 58 counties in California with a published traffic page. Vehicle-miles is total travel, so this ranks by traffic MOVED rather than by how busy a typical road is.
CountyDaily vehicle-milesAverage daily trafficTruck shareRoad miles
1. Los Angeles County204,530,09419,0006.0%8,894
2. San Diego County85,105,40614,3115.5%4,209
3. Riverside County71,474,67312,8818.5%4,160

Most truck-intensive counties in California

California's five most truck-intensive counties account for just 3.2% of the truck vehicle-miles driven in the state. Truck share says where trucks dominate the mix; it does not say where the freight is.

Ranked by truck share of all traffic, across the same 58 counties, shown with the traffic volume that share is measured against.
CountyTruck shareTruck share on highwaysAverage daily trafficDaily vehicle-miles
1. Trinity County24.1%22.7%2,092206,153
2. Siskiyou County21.7%24.4%2,7842,457,295
3. Colusa County21.1%23.4%3,1911,487,588
4. Glenn County19.2%26.0%2,8031,075,542
5. Merced County16.6%22.2%5,6487,127,206

Asking the same question of truck vehicle-miles gives a different answer - Los Angeles County, San Bernardino County, Riverside County, San Diego County and Kern County, together 49.4% of all truck travel in California.

Busiest roads in California

The three busiest roads in California average 268,424 vehicles a day, 21.0 times the state average of 12,766 across all its monitored roads.

Tuskegee Airmen Highway in San Diego County is the busiest road, at 278,569 vehicles a day, 14,761 of them trucks (5.3%). Escondido Freeway in San Diego County is practically level with it at 271,824. Robert T. Monagan Freeway in San Joaquin County carries the most trucks, 18,599 a day (14.1% of its traffic), although it is not among the 10 busiest roads overall.

Freight stands out on Golden State Highway in Kern County and Robert T. Monagan Freeway in San Joaquin County: trucks are 23.8% and 14.1% of the traffic there, against 7.8% state-wide.

Trips using Golden State Highway in Kern County are long: a median of 57.1 minutes against 34.5 state-wide, the mark of a through route.

The truck ranking looks different from the traffic one, sharing just 1 of its 10 roads.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Tuskegee Airmen HighwaySan Diego County · Motorway · 278,569vehicles14,761trucks · 5.3%
Road class
Motorway
Median trip time
30.4 min
Drivers’ median age
43.0 yrs
Drivers’ average income
$137,640

A main artery: Tuskegee Airmen Highway's busiest stretch carries 21.8 times the state average; trucks are 5.3% of it, below the state-wide 7.8%.

2Escondido FreewaySan Diego County · Motorway · 271,824vehicles14,454trucks · 5.3%
Road class
Motorway
Median trip time
32.1 min
Drivers’ median age
42.8 yrs
Drivers’ average income
$138,814

Escondido Freeway is a trunk route for the state, carrying 21.3 times the state average on its busiest stretch; trucks are 5.3% of it, below the state-wide 7.8%.

3Artesia FreewayLos Angeles County · Motorway · 254,879vehicles14,690trucks · 5.8%
Road class
Motorway
Congestion ratio
108.2%
Median trip time
42.5 min
Drivers’ median age
42.7 yrs
Drivers’ average income
$104,297

Artesia Freeway carries 20.0 times the state average at its busiest, 14,690 of them trucks (5.8%, below the state-wide 7.8%).

4San Diego FreewayLos Angeles County · Motorway · 247,964vehicles14,169trucks · 5.7%
Road class
Motorway
Congestion ratio
102.0%
Median trip time
43.2 min
Drivers’ median age
42.4 yrs
Drivers’ average income
$120,614

San Diego Freeway carries 19.4 times the state average on its busiest stretch, where the median trip lasts 43.2 minutes.

5San Francisco – Oakland Bay BridgeSan Francisco County · Motorway · 245,546vehicles14,636trucks · 6.0%
Road class
Motorway
Congestion ratio
116.9%
Median trip time
37.5 min
Drivers’ median age
42.8 yrs
Drivers’ average income
$137,333

At 19.2 times the state average, San Francisco – Oakland Bay Bridge draws drivers from neighborhoods averaging $137,333 in household income.

6Eastshore FreewayAlameda County · Motorway · 228,495vehicles14,638trucks · 6.4%
Road class
Motorway
Congestion ratio
107.0%
Median trip time
41.9 min
Drivers’ median age
43.5 yrs
Drivers’ average income
$116,753

A main artery: Eastshore Freeway's busiest stretch carries 17.9 times the state average; trucks are 6.4% of it, below the state-wide 7.8%.

7Riverside FreewayRiverside County · Motorway · 224,417vehicles15,914trucks · 7.1%
Road class
Motorway
Congestion ratio
108.0%
Median trip time
45.1 min
Drivers’ median age
41.1 yrs
Drivers’ average income
$104,825

Riverside Freeway is a trunk route for the state, carrying 17.6 times the state average on its busiest stretch; trucks are 7.1% of it, below the state-wide 7.8%.

8Century FreewayLos Angeles County · Motorway · 224,387vehicles13,644trucks · 6.1%
Road class
Motorway
Congestion ratio
123.8%
Median trip time
42.0 min
Drivers’ median age
40.8 yrs
Drivers’ average income
$87,009

Century Freeway is one of the more congested roads here: trips take 124% longer than at free-flow speed, against 27% state-wide.

9I 80Sacramento County · Motorway · 222,932vehicles13,368trucks · 6.0%
Road class
Motorway
Congestion ratio
90.2%
Median trip time
35.0 min
Drivers’ median age
44.4 yrs
Drivers’ average income
$100,928

I 80 carries 17.5 times the state average at its busiest, 13,368 of them trucks (6.0%, below the state-wide 7.8%).

10Ontario FreewaySan Bernardino County · Motorway · 222,796vehicles17,503trucks · 7.9%
Road class
Motorway
Congestion ratio
118.0%
Median trip time
41.2 min
Drivers’ median age
42.2 yrs
Drivers’ average income
$116,109

Delays build on Ontario Freeway: its congestion ratio of 118% over free-flow time is well above the state's 27%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Robert T. Monagan FreewaySan Joaquin County · Motorway · 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 carries through traffic: the median trip using it lasts 52.3 minutes, against 34.5 for the state.

2San Bernardino FreewaySan Bernardino County · Motorway · 217,324vehicles18,505trucks · 8.5%
Road class
Motorway
Congestion ratio
108.0%
Median trip time
43.4 min
Drivers’ median age
41.5 yrs
Drivers’ average income
$92,866

San Bernardino Freeway carries 17.0 times the state average on its busiest stretch, where the median trip lasts 43.4 minutes.

3Carquinez BridgeSolano County · Motorway · 132,571vehicles18,389trucks · 13.9%
Road class
Motorway
Congestion ratio
84.5%
Median trip time
49.1 min
Drivers’ median age
44.3 yrs
Drivers’ average income
$114,241

Carquinez Bridge leans on freight: 18,389 trucks a day, 13.9% of its traffic against 7.8% state-wide.

4Arthur H. Breed Junior FreewayAlameda County · Motorway · 202,938vehicles18,317trucks · 9.0%
Road class
Motorway
Congestion ratio
92.6%
Median trip time
48.8 min
Drivers’ median age
44.3 yrs
Drivers’ average income
$156,065

At 15.9 times the state average, Arthur H. Breed Junior Freeway draws drivers from neighborhoods averaging $156,065 in household income.

5Robert T. Monagan FreewayAlameda County · Motorway · 131,260vehicles18,283trucks · 13.9%
Road class
Motorway
Congestion ratio
101.9%
Median trip time
52.9 min
Drivers’ median age
43.0 yrs
Drivers’ average income
$139,726

Drivers on Robert T. Monagan Freeway are on long journeys, a median 52.9 minutes against 34.5 state-wide: a through route more than a local street.

6Pomona FreewaySan Bernardino County · Motorway · 215,885vehicles17,658trucks · 8.2%
Road class
Motorway
Congestion ratio
102.6%
Median trip time
47.4 min
Drivers’ median age
42.3 yrs
Drivers’ average income
$107,076

A main artery: Pomona Freeway's busiest stretch carries 16.9 times the state average; trucks are 8.2% of it, above the state-wide 7.8%.

7Eastshore FreewaySolano County · Motorway · 127,345vehicles17,640trucks · 13.8%
Road class
Motorway
Congestion ratio
82.3%
Median trip time
48.2 min
Drivers’ median age
44.6 yrs
Drivers’ average income
$113,439

Eastshore Freeway is a trunk route for the state, carrying 10.0 times the state average on its busiest stretch; trucks are 13.8% of it, above the state-wide 7.8%.

8Golden State HighwayKern County · Motorway · 74,001vehicles17,632trucks · 23.8%
Road class
Motorway
Congestion ratio
52.5%
Median trip time
57.1 min
Drivers’ median age
39.7 yrs
Drivers’ average income
$72,547

Golden State Highway carries 5.8 times the state average at its busiest, 17,632 of them trucks (23.8%, above the state-wide 7.8%).

9Ontario FreewaySan Bernardino County · Motorway · #10 by traffic222,796vehicles17,503trucks · 7.9%
10CHP Officer John Bailey Memorial FreewaySan Bernardino County · Motorway · 170,504vehicles16,955trucks · 9.9%
Road class
Motorway
Congestion ratio
85.1%
Median trip time
44.9 min
Drivers’ median age
42.3 yrs
Drivers’ average income
$119,603

CHP Officer John Bailey Memorial Freeway carries 13.4 times the state average on its busiest stretch, where the median trip lasts 44.9 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

CaliforniaDepartment 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

Explore further

TrafficZoom platform

— street-level analytics and custom corridor reports.

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— demographics, housing and mobility data.

States near California

The same traffic breakdown for the states closest to California.

Need segment-level traffic data?

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

Counties in California

Traffic counts, truck share, congestion and driver demographics for each of the 58 counties TrafficZoom measures in California.