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Traffic heat map of St. Joseph County, Michigan: 486 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US-131 and Main Street

St. Joseph County, Michigan Traffic Counts

Traffic analytics for St. Joseph County, Michigan, calculated from real-world mobile and sensor networks on 7,562 road segments (486 road miles, about 339 ft each). Its busiest road, US-131, carries 17,118 vehicles a day, 4.9 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 St. Joseph County, Michigan

Traffic

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

vehicles per day3,479
Trucks

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

7.5%
Average travel time

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

36.2 min
Congestion ratio

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

10.8%
Drivers’ average age

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

48.3 yrs
Drivers’ average income

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

$68,721

A typical monitored road in St. Joseph County, Michigan sees 3,479 vehicles per day, while its 486 miles of monitored roads together handle 1,323,924 vehicle-miles traveled per day (≈483 million per year). Trucks are 7.5% of traffic, close to the 7.7% across Michigan.

Longer trips than 81% of counties in Michigan

At 3,479 vehicles per day, the average monitored road in St. Joseph carries 55% less traffic than the state average of 7,697, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. In total volume terms, its road network carries about 0.6% of Michigan's statewide total of vehicle-miles. St. Joseph carries less traffic than 59% of counties in Michigan.

At 36.2 minutes, the average travel time is 8% higher than the state level. Its average travel time of 36.2 minutes is longer than 81% of counties in Michigan.

At 41% lower than the state level, the 10.8% congestion ratio signals smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in St. Joseph County, Michigan

Trafficvehicles per day9,660
Trucks11.0%
Average travel time42.2 min
Congestion ratio22.9%
Drivers’ average age48.7 yrs
Drivers’ average income$73,863

Highways carry a smaller share of travel in St. Joseph County, Michigan, 24% of vehicle-miles; most driving happens on local roads. The average highway carries 9,660 vehicles per day, 205% more than the average non-highway road in the same area, which carries 3,168 vehicles per day.

Yet highways are only 7% of the road network, 33 miles in 362 segments, so each mile of them is 3.5 times as busy as the average road mile.

A typical mix of freight and passenger traffic

The concentration of trucks on highways (11.0%) is 8% lower than the state average for similar road classifications. The highway traffic mix is typical for Michigan: neither freight- nor commuter-dominated.

St. Joseph's highway truck share (11.0%) is lower than 55% of counties in Michigan. St. Joseph's highway truck count is higher than 59% of counties in Michigan, at roughly 1,062 trucks per day.

non-highway traffic icon

Non-highway Traffic in St. Joseph County, Michigan

Trafficvehicles per day3,168
Trucks6.5%
Average travel time35.9 min
Congestion ratio10.2%
Drivers’ average age48.1 yrs
Drivers’ average income$67,429

Local roads carry most of the traffic in St. Joseph County, Michigan: 76% of all vehicle-miles. The average non-highway road carries 3,168 vehicles per day.

Local roads also make up about 93% of the monitored road miles: 452 miles in 7,200 segments, together carrying 1,007,262 vehicle-miles traveled per day (≈368 million per year). Trucks make up 6.5% of non-highway traffic, about 1 in 16 vehicles.

Local congestion 44% below the Michigan average

Non-highway roads carry a truck concentration that's 41% lower than the highway network.

Non-highway congestion (10.2%) runs 44% lower than the state average, pointing to smoother local traffic flow.

St. Joseph's average driver income is higher than 55% of counties in Michigan. St. Joseph's median driver age is lower than 70% of counties in Michigan.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and a long afternoon plateau from 12:00 PM to 6:00 PM, with volumes reaching approximately 65% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 29% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
July–September is the high season, with volumes +8% versus the annual average.
Lowest month:
January is the quietest month, with volumes -14% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In St. Joseph County, Michigan, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +8% in high season.

St. Joseph County vs. Michigan Traffic Comparison

St. Joseph County's biggest difference from the Michigan average is its average daily traffic per road, 55% below it.

MetricSt. Joseph CountyMichigan averageDifference
Traffic3,4797,697-54.8%
Truck % (Total Traffic)7.5%7.7%-2.0%
Truck % (Highway)11.0%12.0%-8.1%
Avg. Travel Time36.2 min33.6 min+7.8%

How St. Joseph County compares

St. Joseph County against nearby counties

Set against the average of the 4 areas nearest to it, St. Joseph County runs 5.8 percentage points less truck traffic; it has the second busiest roads of the five. Smaller and quieter on both counts: a shorter network than the areas around it, carrying lighter traffic across it.

St. Joseph County and the 4 nearest county-level areas by centroid distance, with the Michigan average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
St. Joseph County3,4797.5%1,323,92436.2 min10.8%
LaGrange County, Indiana2,87125.8%1,461,50242.4 min9.9%
Kalamazoo County, Michigan8,4688.5%5,590,10033.3 min21.8%
Cass County, Michigan3,2836.6%1,073,02132.9 min10.4%
Branch County, Michigan3,31812.3%1,009,26234.1 min11.9%
Michigan average7,6977.7%N/A33.6 min18.5%

St. Joseph County ranked within Michigan

St. Joseph County sits in the top quarter of the Michigan field on average travel time, at #16 of 83.

St. Joseph County ranked among 83 county-level areas in Michigan (1 = highest); measures without data in every county rank a smaller field, down to 74.
MeasureSt. Joseph CountyMichigan rank
Traffic volume (AADT)3,479#49 of 83
Highway vehicle-miles per day316,662#49 of 74
Truck share on highways11.0%#41 of 74
Highway trucks per day1,062#31 of 74
Average travel time36.2 min#16 of 83
Average driver income$68,721#38 of 83
Average driver age48.3 yrs#58 of 83

Busiest roads in St. Joseph County, Michigan

Traffic concentrates on a few corridors: the three busiest roads average 13,223 vehicles a day, against 3,479 on the average road in St. Joseph County.

US-131 is the busiest road, at 17,118 vehicles a day, 1,786 of them trucks (10.4%). It tops the truck ranking too, with the most trucks.

Trucks make up 13.9% of traffic on White Pigeon Road and 12.9% on Constantine Bypass, against 7.5% across all roads in the county.

Constantine Bypass carries longer journeys than most roads here, with a median trip of 48.8 minutes against 36.2 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US-131Trunk road · 17,118vehicles1,786trucks · 10.4%
Road class
Trunk road
Congestion ratio
23.3%
Median trip time
42.0 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$75,028

US-131 peaks at 17,118 vehicles a day, 4.9 times the county average; trucks are 10.4% of it, above the county-wide 7.5%.

2Main StreetPrimary road · 11,463vehicles712trucks · 6.2%
Road class
Primary road
Congestion ratio
36.4%
Median trip time
41.8 min
Drivers’ median age
47.8 yrs
Drivers’ average income
$69,171

Main Street is one of the more congested roads here: trips take 36% longer than at free-flow speed, against 11% county-wide.

3US-131/M-60Trunk road · 11,087vehicles776trucks · 7.0%
Road class
Trunk road
Congestion ratio
25.6%
Median trip time
43.2 min
Drivers’ median age
48.8 yrs
Drivers’ average income
$70,032

Delays build on US-131/M-60: its congestion ratio of 26% over free-flow time is well above the county's 11%.

4Centerville RoadPrimary road · 10,418vehicles537trucks · 5.2%
Road class
Primary road
Congestion ratio
16.4%
Median trip time
34.7 min
Drivers’ median age
47.0 yrs
Drivers’ average income
$65,626

Centerville Road carries 3.0 times the county average at its busiest, 537 of them trucks (5.2%, below the county-wide 7.5%).

5Michigan AvenuePrimary road · 8,912vehicles444trucks · 5.0%
Road class
Primary road
Congestion ratio
12.4%
Median trip time
32.2 min
Drivers’ median age
49.4 yrs
Drivers’ average income
$58,625

Michigan Avenue carries 2.6 times the county average on its busiest stretch, where the median trip lasts 32.2 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US-131Trunk road · #1 by traffic17,118vehicles1,786trucks · 10.4%
2White Pigeon RoadTrunk road · 8,262vehicles1,149trucks · 13.9%
Road class
Trunk road
Congestion ratio
20.5%
Median trip time
41.8 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$70,209

At 2.4 times the county average, White Pigeon Road draws drivers from neighborhoods averaging $70,209 in household income.

3Constantine BypassTrunk road · 7,618vehicles984trucks · 12.9%
Road class
Trunk road
Congestion ratio
17.6%
Median trip time
48.8 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$71,335

The busiest stretch of Constantine Bypass carries 2.2 times the county average; trucks are 12.9% of it, above the county-wide 7.5%.

4US-131/M-60Trunk road · #3 by traffic11,087vehicles776trucks · 7.0%
5Main StreetPrimary road · #2 by traffic11,463vehicles712trucks · 6.2%
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

St. JosephDepartment 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 St. Joseph County

The same traffic breakdown for the areas closest to St. Joseph County, Michigan.

Need segment-level traffic data?

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