Need segment-level traffic data?

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

Get insights →
Traffic heat map of Merced County, California: 1,039 miles of roads shaded from blue (light) to red (heavy traffic), busiest on CA 99 and CA 99 / CA 59 / CA 140

Merced County, California Traffic Counts

Traffic analytics for Merced County, California, calculated from real-world mobile and sensor networks on 12,491 road segments (1,039 road miles, about 439 ft each). Its highways carry one of the top 5 truck shares of any county in California. 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
Find my place
total traffic icon

Total Traffic Volume & Performance in Merced County, California

Traffic

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

vehicles per day5,648
Trucks

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

16.6%
Average travel time

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

35.9 min
Congestion ratio

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

15.7%
Drivers’ average age

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

40.3 yrs
Drivers’ average income

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

$75,814

The average monitored road in Merced County, California carries 5,648 vehicles per day. Across its 1,039 miles of monitored roads, that adds up to 7,127,206 vehicle-miles traveled per day (≈2.6 billion per year). About 1 in 6 vehicles is a truck, well above the 7.8% across California - a freight-heavy mix.

Traffic 56% below the California average

Merced sees 56% lower average daily traffic volume than the state average (5,648 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. Network-wide, Merced accounts for about 0.8% of California's statewide total of vehicle-miles. 61% of counties in California see more traffic than Merced's 5,648 vehicles per day.

The average trip takes 35.9 minutes, on par with the state level. 74% of counties in California have a shorter average travel time than Merced's 35.9 minutes.

The congestion ratio of 15.7% is 43% lower, pointing to smoother traffic flow than the state level - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Merced County, California

Trafficvehicles per day16,085
Trucks22.2%
Average travel time56.8 min
Congestion ratio33.4%
Drivers’ average age40.9 yrs
Drivers’ average income$77,071

A little more than half of the driving in Merced County, California happens on highways: 63% of all vehicle-miles. The average highway carries 16,085 vehicles per day, 237% more than the average non-highway road in the same area, which carries 4,767 vehicles per day.

With 25% of the road miles (256 miles in 972 segments), highways punch above their length, carrying 4,522,600 vehicle-miles traveled per day (≈1.7 billion per year).

By highway travel volume, Merced outranks 55% of counties in California.

A major freight corridor

At 22.2%, highway truck share is 114% higher than the state average. That marks Merced as a major freight corridor, where highway access is what logistics operators compete on.

Merced's highway truck share (22.2%) is higher than 92% of counties in California. Merced's highway truck count is higher than 71% of counties in California, at roughly 3,579 trucks per day.

non-highway traffic icon

Non-highway Traffic in Merced County, California

Trafficvehicles per day4,767
Trucks6.7%
Average travel time34.1 min
Congestion ratio14.2%
Drivers’ average age39.8 yrs
Drivers’ average income$74,891

Local roads carry a significant share of travel in Merced County, California: 37% of all vehicle-miles. A typical local road sees 4,767 vehicles per day.

Local roads make up 75% of the monitored road miles (783 miles in 11,519 segments) but carry less than their share of travel: 2,604,606 vehicle-miles traveled per day (≈951 million per year). Trucks make up 6.7% of non-highway traffic, about 1 in 15 vehicles.

Younger drivers than 96% of counties in California

Compared to highways, non-highway routes see 70% fewer trucks by share.

Non-highway congestion (14.2%) runs 46% lower than the state average, pointing to smoother local traffic flow.

77% of counties in California see higher average driver income among trip origins than Merced. Merced's median driver age is lower than 96% of counties in California.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Merced County, California, the peak hour concentrates about 7% of the day's traffic.

Merced County vs. California Traffic Comparison

Merced County's biggest difference from the California average is its highway truck share, 114% above it. Its truck share is also 113% above.

MetricMerced CountyCalifornia averageDifference
Traffic5,64812,766-55.8%
Truck % (Total Traffic)16.6%7.8%+113.0%
Truck % (Highway)22.2%10.4%+114.4%
Avg. Travel Time35.9 min34.5 min+4.0%

How Merced County compares

Merced County has a higher truck share than any nearby county

Set against the average of the 4 areas nearest to it, Merced County runs 6.1 percentage points more truck traffic; it has the third 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.

Merced 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
Merced County5,64816.6%7,127,20635.9 min15.7%
Stanislaus County, California10,3029.8%11,775,21533.1 min27.2%
Mariposa County, California2,4988.9%395,32433.7 min3.5%
San Benito County, California7,89410.4%1,898,68033.7 min21.0%
Madera County, California5,37612.7%5,392,65337.0 min19.4%
California average12,7667.8%N/A34.5 min27.4%

Merced County ranked within California

Merced County sits in the bottom quarter of the California field on average driver age, at #56 of 58.

Merced County ranked among 58 county-level areas in California (1 = highest); measures without data in every county rank a smaller field, down to 52.
MeasureMerced CountyCalifornia rank
Traffic volume (AADT)5,648#36 of 58
Highway vehicle-miles per day4,522,600#24 of 52
Truck share on highways22.2%#5 of 52
Highway trucks per day3,579#16 of 52
Average travel time35.9 min#16 of 58
Average driver income$75,814#45 of 58
Average driver age40.3 yrs#56 of 58

The two ends of this table sit far apart: #5 of 52 on truck share on highways, against #56 of 58 on average driver age.

Busiest roads in Merced County, California

On their busiest stretches, the three busiest roads in Merced County carry 57,317 vehicles a day on average, 10.1 times the typical road in the county (5,648).

CA 99 is the busiest road, at 65,148 vehicles a day, 13,337 of them trucks (20.5%). It tops the truck ranking too, with the most trucks.

Trips using Side Freeway are long: a median of 82.7 minutes against 35.9 county-wide, the mark of a through route.

Freight stands out on Side Freeway: trucks are 31.4% of the traffic there, against 16.6% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1CA 99Motorway · 65,148vehicles13,337trucks · 20.5%
Road class
Motorway
Congestion ratio
67.9%
Median trip time
53.4 min
Drivers’ median age
40.5 yrs
Drivers’ average income
$78,404

Travel on CA 99's busiest stretch runs 68% over free-flow time, against 16% across the county, so expect slower peak hours.

2CA 99 / CA 59 / CA 140Motorway · 53,927vehicles11,004trucks · 20.4%
Road class
Motorway
Congestion ratio
63.3%
Median trip time
52.2 min
Drivers’ median age
40.0 yrs
Drivers’ average income
$71,401

CA 99 / CA 59 / CA 140 is one of the more congested roads here: trips take 63% longer than at free-flow speed, against 16% county-wide.

3Golden State HighwayMotorway · 52,877vehicles11,888trucks · 22.5%
Road class
Motorway
Congestion ratio
59.4%
Median trip time
64.0 min
Drivers’ median age
40.7 yrs
Drivers’ average income
$82,224

Drivers on Golden State Highway are on long journeys, a median 64.0 minutes against 35.9 county-wide: a through route more than a local street.

4CA 99 / CA 140Motorway · 48,965vehicles11,024trucks · 22.5%
Road class
Motorway
Congestion ratio
56.8%
Median trip time
55.0 min
Drivers’ median age
40.1 yrs
Drivers’ average income
$70,701

At 8.7 times the county average, CA 99 / CA 140 draws drivers from neighborhoods averaging $70,701 in household income.

5Pacheco Pass HighwayTrunk road · 35,157vehicles6,608trucks · 18.8%
Road class
Trunk road
Congestion ratio
33.0%
Median trip time
78.1 min
Drivers’ median age
42.2 yrs
Drivers’ average income
$85,902

Pacheco Pass Highway carries through traffic: the median trip using it lasts 78.1 minutes, against 35.9 for the county.

Ranked by trucks per day

Cars and light vehiclesTrucks
1CA 99Motorway · #1 by traffic65,148vehicles13,337trucks · 20.5%
2Golden State HighwayMotorway · #3 by traffic52,877vehicles11,888trucks · 22.5%
3CA 99 / CA 140Motorway · #4 by traffic48,965vehicles11,024trucks · 22.5%
4CA 99 / CA 59 / CA 140Motorway · #2 by traffic53,927vehicles11,004trucks · 20.4%
5Side FreewayMotorway · 25,145vehicles7,885trucks · 31.4%
Road class
Motorway
Congestion ratio
25.7%
Median trip time
82.7 min
Drivers’ median age
43.2 yrs
Drivers’ average income
$86,319

Side Freeway carries 4.5 times the county average at its busiest, 7,885 of them trucks (31.4%, above the county-wide 16.6%).

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

MercedDepartment 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.
link arrow icon
Data current as of:
Q3 2026

Explore further

TrafficZoom platform

— street-level analytics and custom corridor reports.

Map AI

— demographics, housing and mobility data.

Counties near Merced County

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

Need segment-level traffic data?

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