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Traffic heat map of Tuolumne County, California: 301 miles of roads shaded from blue (light) to red (heavy traffic), busiest on CA 108 and Washington Street

Tuolumne County, California Traffic Counts

Traffic analytics for Tuolumne County, California, calculated from real-world mobile and sensor networks on 3,726 road segments (301 road miles, about 427 ft each). Its busiest road, CA 108, carries 20,214 vehicles a day, 4.7 times the average road. Use the figures below to move from assumptions to certainty on retail locations, logistics and road planning.
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 Tuolumne County, California

Traffic

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

vehicles per day4,284
Trucks

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

6.5%
Average travel time

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

32.4 min
Congestion ratio

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

15.5%
Drivers’ average age

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

55.1 yrs
Drivers’ average income

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

$84,220

Our data shows 4,284 vehicles per day on the average road in Tuolumne County, California, and 1,187,911 vehicle-miles traveled per day (≈434 million per year) across its 301 miles of monitored roads. Trucks are a smaller part of the mix than across California: 6.5% against 7.8%.

Traffic 66% below the California average

Tuolumne sees 66% lower average daily traffic volume than the state average (4,284 vehicles per day against 12,766), suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 0.1% of California's statewide total. 79% of counties in California see more traffic than Tuolumne's 4,284 vehicles per day.

Journey times run 6% lower than the state level, at 32.4 minutes on average. Its average travel time of 32.4 minutes is shorter than 70% of counties in California.

The congestion ratio of 15.5% is 44% lower, pointing to smoother traffic flow than the state level - travel times are easy to plan around for scheduled deliveries.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Tuolumne County, California, the peak hour concentrates about 8% of the day's traffic.

Tuolumne County vs. California Traffic Comparison

Tuolumne County's biggest difference from the California average is its average daily traffic per road, 66% below it. Its truck share is also 16% below.

MetricTuolumne CountyCalifornia averageDifference
Traffic4,28412,766-66.4%
Truck % (Total Traffic)6.5%7.8%-16.3%
Avg. Travel Time32.4 min34.5 min-5.9%

How Tuolumne County compares

Tuolumne County is more congested than any nearby county

Compared with its 4 closest neighbours, Tuolumne County is 146.9% more congested and carries 43.2% more traffic on a typical road; it has the second 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.

Tuolumne 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
Tuolumne County4,2846.5%1,187,91132.4 min15.5%
Mariposa County, California2,4988.9%395,32433.7 min3.5%
Alpine County, California1,43310.2%86,55949.0 min2.9%
Calaveras County, California3,2266.8%907,92531.8 min13.2%
Mono County, California4,80911.7%1,027,86335.2 min5.5%
California average12,7667.8%N/A34.5 min27.4%

Tuolumne County ranked within California

Average driver age places Tuolumne County #6 of 58 in California - the top quarter of the state.

Tuolumne County ranked among 58 county-level areas in California (1 = highest).
MeasureTuolumne CountyCalifornia rank
Traffic volume (AADT)4,284#46 of 58
Average travel time32.4 min#41 of 58
Average driver income$84,220#34 of 58
Average driver age55.1 yrs#6 of 58

The two ends of this table sit far apart: #6 of 58 on average driver age, against #46 of 58 on average daily traffic volume.

Busiest roads in Tuolumne County, California

On their busiest stretches, the three busiest roads in Tuolumne County carry 18,166 vehicles a day on average, 4.2 times the typical road in the county (4,284).

CA 108 is the busiest road, at 20,214 vehicles a day, 928 of them trucks (4.6%). CA 108 / CA 120 carries the most trucks, 1,373 a day (9.2% of its traffic), although it ranks #5 for all traffic.

CA 108 / CA 120 carries longer journeys than most roads here, with a median trip of 50.2 minutes against 32.4 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1CA 108Primary road · 20,214vehicles928trucks · 4.6%
Road class
Primary road
Median trip time
25.3 min
Drivers’ median age
56.2 yrs
Drivers’ average income
$84,388

On its busiest stretch, CA 108 carries 4.7 times the county average; trucks are 4.6% of it, below the county-wide 6.5%.

2Washington StreetPrimary road · 17,319vehicles692trucks · 4.0%
Road class
Primary road
Congestion ratio
56.3%
Median trip time
32.6 min
Drivers’ median age
56.0 yrs
Drivers’ average income
$82,616

Delays build on Washington Street: its congestion ratio of 56% over free-flow time is well above the county's 15%.

3CA 49 / CA 108Primary road · 16,966vehicles1,028trucks · 6.1%
Road class
Primary road
Congestion ratio
42.0%
Median trip time
37.3 min
Drivers’ median age
54.2 yrs
Drivers’ average income
$83,930

Travel on CA 49 / CA 108's busiest stretch runs 42% over free-flow time, against 15% across the county, so expect slower peak hours.

4Mono WaySecondary road · 15,522vehicles448trucks · 2.9%
Road class
Secondary road
Congestion ratio
38.6%
Median trip time
27.9 min
Drivers’ median age
55.2 yrs
Drivers’ average income
$82,396

Mono Way peaks at 15,522 vehicles a day, 3.6 times the county average; trucks are 2.9% of it, below the county-wide 6.5%.

5CA 108 / CA 120Primary road · 14,978vehicles1,373trucks · 9.2%
Road class
Primary road
Congestion ratio
25.1%
Median trip time
50.2 min
Drivers’ median age
50.7 yrs
Drivers’ average income
$86,547

CA 108 / CA 120 carries 3.5 times the county average at its busiest, 1,373 of them trucks (9.2%, above the county-wide 6.5%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1CA 108 / CA 120Primary road · #5 by traffic14,978vehicles1,373trucks · 9.2%
2CA 49 / CA 108Primary road · #3 by traffic16,966vehicles1,028trucks · 6.1%
3CA 108Primary road · #1 by traffic20,214vehicles928trucks · 4.6%
4Washington StreetPrimary road · #2 by traffic17,319vehicles692trucks · 4.0%
5Parrotts Ferry RoadPrimary road · 11,988vehicles528trucks · 4.4%
Road class
Primary road
Congestion ratio
28.5%
Median trip time
28.9 min
Drivers’ median age
55.8 yrs
Drivers’ average income
$80,686

Parrotts Ferry Road carries 2.8 times the county average on its busiest stretch, where the median trip lasts 28.9 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

TuolumneDepartment 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 Tuolumne County

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

Need segment-level traffic data?

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