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TrafficThe average number of vehicles that travel each day over any road in the road network. | vehicles per day12,766 |
|---|---|
TrucksThe percentage of the total traffic volume composed of heavy vehicles. | 7.8% |
Average travel timeThe average time of travel averaged among all vehicles traveling on the road network. | 34.5 min |
Congestion ratioThe rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network. | 27.4% |
Drivers’ average ageAverage age of residents in the geographic areas where the vehicle trips originated. | 43.2 yrs |
Drivers’ average incomeAverage 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.
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.
| Traffic | vehicles per day37,794 |
|---|---|
| Trucks | 10.4% |
| Average travel time | 41.0 min |
| Congestion ratio | 62.6% |
| Drivers’ average age | 43.2 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.
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.
| Traffic | vehicles per day11,652 |
|---|---|
| Trucks | 4.8% |
| Average travel time | 34.3 min |
| Congestion ratio | 26.5% |
| Drivers’ average age | 43.5 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.
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.
The average daily traffic per road sets California apart: 83% above the United States average. Its highway truck share, by contrast, is 21% below.
| Metric | California | United States average | Difference |
|---|---|---|---|
| Traffic | 12,766 | 6,986 | +82.7% |
| Truck % (Total Traffic) | 7.8% | 9.3% | -16.9% |
| Truck % (Highway) | 10.4% | 13.1% | -20.6% |
| Avg. Travel Time | 34.5 min | 33.3 min | +3.6% |
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.
| State | Average daily traffic | Truck share | Daily vehicle-miles | Average travel time | Congestion ratio |
|---|---|---|---|---|---|
| California | 12,766 | 7.8% | 927,539,301 | 34.5 min | 27.4% |
| Nevada | 7,914 | 9.7% | 63,246,043 | 33.8 min | 17.1% |
| Arizona | 10,009 | 9.6% | 174,389,603 | 32.9 min | 18.1% |
| Utah | 10,198 | 8.9% | 87,040,466 | 32.2 min | 21.2% |
| Idaho | 5,734 | 9.7% | 45,169,444 | 33.8 min | 16.0% |
| United States average | 6,986 | 9.3% | N/A | 33.3 min | 18.9% |
California's three busiest counties account for 38.9% of all the vehicle-miles measured in the state.
| County | Daily vehicle-miles | Average daily traffic | Truck share | Road miles |
|---|---|---|---|---|
| 1. Los Angeles County | 204,530,094 | 19,000 | 6.0% | 8,894 |
| 2. San Diego County | 85,105,406 | 14,311 | 5.5% | 4,209 |
| 3. Riverside County | 71,474,673 | 12,881 | 8.5% | 4,160 |
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.
| County | Truck share | Truck share on highways | Average daily traffic | Daily vehicle-miles |
|---|---|---|---|---|
| 1. Trinity County | 24.1% | 22.7% | 2,092 | 206,153 |
| 2. Siskiyou County | 21.7% | 24.4% | 2,784 | 2,457,295 |
| 3. Colusa County | 21.1% | 23.4% | 3,191 | 1,487,588 |
| 4. Glenn County | 19.2% | 26.0% | 2,803 | 1,075,542 |
| 5. Merced County | 16.6% | 22.2% | 5,648 | 7,127,206 |
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.
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.
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%.
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%.
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%).
San Diego Freeway carries 19.4 times the state average on its busiest stretch, where the median trip lasts 43.2 minutes.
At 19.2 times the state average, San Francisco – Oakland Bay Bridge draws drivers from neighborhoods averaging $137,333 in household income.
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%.
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%.
Century Freeway is one of the more congested roads here: trips take 124% longer than at free-flow speed, against 27% state-wide.
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%).
Delays build on Ontario Freeway: its congestion ratio of 118% over free-flow time is well above the state's 27%.
Robert T. Monagan Freeway carries through traffic: the median trip using it lasts 52.3 minutes, against 34.5 for the state.
San Bernardino Freeway carries 17.0 times the state average on its busiest stretch, where the median trip lasts 43.4 minutes.
Carquinez Bridge leans on freight: 18,389 trucks a day, 13.9% of its traffic against 7.8% state-wide.
At 15.9 times the state average, Arthur H. Breed Junior Freeway draws drivers from neighborhoods averaging $156,065 in household income.
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.
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%.
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%.
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%).
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.
The average monitored road in California carries 12,766 vehicles per day, 83% more than the national average of 6,986.
Yes - California has the highest average traffic volume of any state nationwide, at 12,766 vehicles per day.
Weekday traffic has two busy windows: AM peak 7:00 AM–9:00 AM and a long afternoon plateau from 3:00 PM to 9:00 PM - about 64% above the daily average.
Drivers on California roads have a median age of 43 years, younger than the national average of 46, and the median household income of the neighborhoods trips originate from averages $111,276, 22% above the national average.
The average trip in California takes 34.5 minutes, about the same as the national average, delays at signals and congestion included.
Tuskegee Airmen Highway in San Diego County carries the most, 278,569 vehicles per day on its busiest stretch, followed by Escondido Freeway in San Diego County (271,824), Artesia Freeway in Los Angeles County (254,879), San Diego Freeway in Los Angeles County (247,964), San Francisco – Oakland Bay Bridge in San Francisco County (245,546). Figures are AADT, both directions combined.
Robert T. Monagan Freeway in San Joaquin County, with about 18,599 trucks per day on its busiest stretch, 14.1% of its 131,576 vehicles.
About 278,569 vehicles per day in both directions on its busiest stretch, including 14,761 trucks (5.3%). Traffic is lower on its quieter stretches; TrafficZoom shows the count for every segment.

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