This page delivers traffic analytics for Sonoma County, California. Our metrics are calculated with multi-sourced, cross-verified data from real-world mobile and sensor networks, and averaged for Sonoma County, California among 920 road miles divided in 23,757 segments. Our metrics go beyond simple volume counts to provide actionable insights on traffic intensity, congestion, commercial vehicle flow, and network performance with highest possible granularity (average segment length is 204 ft). Whether you are evaluating a new retail location, planning logistics routes, or assessing infrastructure needs, this data helps you move from assumptions to certainty.
Data sourced from TrafficZoom's proprietary analytics platform.
The average number of vehicles that travel each day over any road in the road network.
10,667
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
6.5%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
32.4 min
Congestion ratio
Congestion ratio
The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.
28.9%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
46.3 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$109,586
Our data indicates an estimated average traffic volume of 10,667 vehicles per day in Sonoma County, California that results in 10,645,614 vehicle-miles traveled per day (≈3.9 billion per year). The traffic stream is comprised of an average of 1 truck for every 15 vehicles. Typical time spent behind the wheel per trip is 32.4 minutes, which already accounts for delays at signals, intersections, and congestion.
Analytical insight
When compared to the California state averages: At 10,667 vehicles per day, the average monitored road in Sonoma carries 16% less traffic than the state average of 12,766 vehicles per day - a critical factor for logistics and site planning. In total volume terms, its road network carries 10,645,614 vehicle-miles traveled per day (≈3.9 billion per year), about 1.1% of California's statewide total. Journey times run 6% lower than the state level, at 32.4 minutes on average. The congestion ratio of 28.9% is 5% higher, pointing to more pronounced congestion than the state level - crucial for traffic control improvement and logistics planning. 81% of counties in California see less traffic than Sonoma's 10,667 vehicles per day. On travel time, Sonoma runs longer than 27% of counties in California.
Highway vs. Non-Highway Traffic Analysis
Highway Traffic
Traffic
Traffic
The average number of vehicles that travel each day over any road in the road network.
35,966
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
8.7%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
33.8 min
Congestion ratio
Congestion ratio
The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.
62.1%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
46.1 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$107,520
A significant volume of traffic in Sonoma County, California utilizes the highway network. The average highway carries 35,966 vehicles per day, 255% more than the average non-highway road in the same area, which carries 10,134 vehicles per day. That average covers 140 highway road miles divided in 490 segments (average segment length 1,510 ft), together carrying 4,607,973 vehicle-miles traveled per day (≈1.7 billion per year). 57% of counties in California move less traffic on their highways. Trucks constitute 8.7% of highway traffic.
Analytical insight
The concentration of trucks on highways (8.7%) is 16% lower than the state average for similar road classifications. This indicates Sonoma serves as a primarily local traffic hub. For logistics operators, this validates the importance of local access. Sonoma's highway truck share (8.7%) is higher than 33% of counties in California. Sonoma's highway truck count is higher than 51% of counties in California, at roughly 3,125 trucks per day.
Non-highway traffic
Traffic
Traffic
The average number of vehicles that travel each day over any road in the road network.
10,134
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
4.9%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
32.3 min
Congestion ratio
Congestion ratio
The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.
28.2%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
46.4 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$110,966
The non-highway road network in Sonoma County, California supports a substantial volume of traffic. The average non-highway road carries 10,134 vehicles per day, 72% less than the average highway in the same area, which carries 35,966 vehicles per day. That average covers 780 non-highway road miles divided in 23,267 segments (average segment length 177 ft), together carrying 6,037,642 vehicle-miles traveled per day (≈2.2 billion per year). Trucks constitute 4.9% of non-highway traffic.
Analytical insight
Compared to highways, non-highway routes see 44% fewer trucks by share. Non-highway congestion (28.2%) runs 6% higher than the state average, pointing to slower local traffic flow. 27% of counties in California see shorter overall travel times than Sonoma. Trip origins here have higher average income than 75% of counties in California. The driver population here skews older than 60% of counties in California.
Time-of-Day & Seasonal Patterns
Peak Traffic Windows
Weekday peaks:
AM peak 8:00 AM–9:00 AM and PM peak 3:00 PM–8:00 PM, with volumes reaching approximately 77% higher than the daily average.
Weekend traffic:
Weekend volumes run about 14% below weekday levels.
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +23% versus the annual average.
Lowest month:
February is the quietest month, with volumes -39% versus the annual average.
Analytical insight
In Sonoma County, California, the peak hour concentrates about 7% of the day's traffic, and seasonal swing is pronounced at +23% in high season.
Traffic Flow Profile Comparison
Metric
Sonoma
California
Average
Difference
Traffic
10,667
12,766
-16.4%
Truck % (Total Traffic)
6.5%
7.8%
-16.0%
Truck % (Highway)
8.7%
10.4%
-16.3%
Avg. Travel Time
32.4 min
34.5 min
-6.2%
Frequently Asked Questions
The average daily traffic volume is calculated at 10,667 vehicles per day, providing a baseline for daily operations and site assessment.
Sonoma carries more traffic than 81% of counties in California, averaging 10,667 vehicles per day.
Drivers on Sonoma roads have a median age of 46 years, and the median household income of the neighborhoods trips originate from averages $109,586 - useful context for retail siting and customer profiling.
Approximately 5% of highway traffic and 1% of non-highway traffic consists of vehicles whose trip originates outside Sonoma County, California. This indicates that a portion of highway traffic is regional pass-through, while local roads are more representative of resident and commuter activity.
Weekday peaks occur between 8:00 AM and 9:00 AM in the morning and between 3:00 PM and 8:00 PM in the evening - about 77% above the daily average.
Trucks account for approximately 6.5% of the total traffic mix across all road types, with a significantly higher concentration of 8.7% on highways.
The average travel time for drivers is 32.4 minutes, offering a standard metric for commute and delivery route planning.
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)
