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Traffic heat map of Monroe County, Michigan: 657 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Detroit-Toledo Expressway and I 75

Monroe County, Michigan Traffic Counts

How busy are the roads of Monroe County, Michigan? We measure 657 road miles, divided into 15,953 segments, with multi-sourced, cross-verified mobile and sensor data. Its highways rank among the top 3 counties in Michigan for trucks per day. The breakdown below covers volume, trucks, congestion and driver profiles for retailers, logistics planners and engineers.
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 Monroe County, Michigan

Traffic

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

vehicles per day4,956
Trucks

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

14.4%
Average travel time

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

32.7 min
Congestion ratio

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

13.2%
Drivers’ average age

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

49.1 yrs
Drivers’ average income

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

$80,104

Our data shows 4,956 vehicles per day on the average road in Monroe County, Michigan, and 4,340,821 vehicle-miles traveled per day (≈1.6 billion per year) across its 657 miles of monitored roads. Freight weighs heavily here: trucks are 14.4% of traffic, against 7.7% across Michigan.

Busier roads than 72% of counties in Michigan

At 4,956 vehicles per day, the average monitored road in Monroe carries 36% less traffic than the state average of 7,697, suggesting less demand on each road - lighter roads for freight, but less passing trade for roadside retail. Network-wide, Monroe accounts for about 2.0% of Michigan's statewide total of vehicle-miles. By volume, Monroe's 4,956 vehicles per day outpaces 72% of counties in Michigan.

The average trip takes 32.7 minutes, on par with the state level. On travel time, Monroe runs shorter than 65% of counties in Michigan.

Congestion runs 28% lower than the state level, at a ratio of 13.2%, which means smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Monroe County, Michigan

Trafficvehicles per day15,016
Trucks22.1%
Average travel time52.5 min
Congestion ratio26.1%
Drivers’ average age48.3 yrs
Drivers’ average income$82,030

Highways carry more than half of all travel in Monroe County, Michigan (56% of vehicle-miles). The average highway carries 15,016 vehicles per day, 223% more than the average non-highway road in the same area, which carries 4,654 vehicles per day.

Highways make up 20% of the monitored road miles (132 miles, 464 segments), so they carry more than their share: 2,425,387 vehicle-miles traveled per day (≈885 million per year).

That is more highway travel volume than 88% of counties in Michigan.

More highway trucks than 99% of counties in Michigan

Highway truck concentration here runs 85% higher than the state average, at 22.1%. That marks Monroe as a major freight corridor, where highway access is what logistics operators compete on.

97% of counties in Michigan see a lower highway truck share than Monroe's 22.1%. 99% of counties in Michigan see fewer highway trucks per day than Monroe's roughly 3,323.

non-highway traffic icon

Non-highway Traffic in Monroe County, Michigan

Trafficvehicles per day4,654
Trucks4.7%
Average travel time32.1 min
Congestion ratio12.9%
Drivers’ average age49.3 yrs
Drivers’ average income$79,479

A significant share of driving in Monroe County, Michigan, 44% of vehicle-miles, happens on local roads. A typical local road sees 4,654 vehicles per day.

Local roads make up 80% of the monitored road miles (525 miles in 15,489 segments) but carry less than their share of travel: 1,915,434 vehicle-miles traveled per day (≈699 million per year). Trucks make up 4.7% of non-highway traffic, about 1 in 21 vehicles.

Drivers from higher-income areas than 82% of counties in Michigan

Compared to highways, non-highway routes see 79% fewer trucks by share.

The non-highway congestion ratio of 12.9% is 30% lower than the state level, suggesting more efficient local mobility than the state average.

Trip origins here have higher average income than 82% of counties in Michigan. Monroe's median driver age is lower than 66% 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 PM peak 4:00 PM–6:00 PM, with volumes reaching approximately 75% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 17% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +8% versus the annual average.
Lowest month:
January is the quietest month, with volumes -17% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Monroe 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.

Monroe County vs. Michigan Traffic Comparison

Monroe County's biggest difference from the Michigan average is its truck share, 88% above it. Its highway truck share is also 85% above.

MetricMonroe CountyMichigan averageDifference
Traffic4,9567,697-35.6%
Truck % (Total Traffic)14.4%7.7%+87.8%
Truck % (Highway)22.1%12.0%+85.0%
Avg. Travel Time32.7 min33.6 min-2.5%

How Monroe County compares

Monroe County has a higher truck share than any nearby county

Set against the average of the 4 areas nearest to it, Monroe County moves 34.6% of the total daily travel and carries 38.7% less traffic on a typical road; it has the quietest roads of the five. Freight passes through here that never reaches the areas around it: the truck share is high precisely because the local car traffic is not.

Monroe 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
Monroe County4,95614.4%4,340,82132.7 min13.2%
Lucas County, Ohio8,1549.1%8,092,80232.1 min21.8%
Washtenaw County, Michigan7,5008.5%9,153,08434.1 min17.5%
Wayne County, Michigan11,2937.0%31,142,24436.5 min21.5%
Lenawee County, Michigan5,4176.1%1,759,74637.6 min15.0%
Michigan average7,6977.7%N/A33.6 min18.5%

Monroe County ranked within Michigan

Monroe County sits in Michigan's top three on truck share on highways and highway truck volume.

Monroe County ranked among 83 county-level areas in Michigan (1 = highest); measures without data in every county rank a smaller field, down to 74.
MeasureMonroe CountyMichigan rank
Traffic volume (AADT)4,956#24 of 83
Highway vehicle-miles per day2,425,387#10 of 74
Truck share on highways22.1%#3 of 74
Highway trucks per day3,323#2 of 74
Average travel time32.7 min#53 of 83
Average driver income$80,104#16 of 83
Average driver age49.1 yrs#55 of 83

Busiest roads in Monroe County, Michigan

On their busiest stretches, the three busiest roads in Monroe County carry 46,037 vehicles a day on average, 9.3 times the typical road in the county (4,956).

Detroit-Toledo Expressway is the busiest road, at 50,200 vehicles a day, 11,440 of them trucks (22.8%). I 75 carries the most trucks, 12,195 a day (26.3% of its traffic), although it ranks #2 for all traffic.

I 75 carries longer journeys than most roads here, with a median trip of 56.3 minutes against 32.7 county-wide.

Trucks make up 26.3% of traffic on I 275 and 26.3% on I 75, against 14.4% across all roads in the county.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Detroit-Toledo ExpresswayMotorway · 50,200vehicles11,440trucks · 22.8%
Road class
Motorway
Congestion ratio
34.5%
Median trip time
52.4 min
Drivers’ median age
48.8 yrs
Drivers’ average income
$79,937

Drivers on Detroit-Toledo Expressway are on long journeys, a median 52.4 minutes against 32.7 county-wide: a through route more than a local street.

2I 75Motorway · 46,380vehicles12,195trucks · 26.3%
Road class
Motorway
Congestion ratio
28.3%
Median trip time
56.3 min
Drivers’ median age
48.5 yrs
Drivers’ average income
$76,955

A main artery: I 75's busiest stretch carries 9.4 times the county average; trucks are 26.3% of it, above the county-wide 14.4%.

3US 23Motorway · 41,532vehicles6,545trucks · 15.8%
Road class
Motorway
Congestion ratio
39.3%
Median trip time
46.4 min
Drivers’ median age
48.0 yrs
Drivers’ average income
$89,251

US 23 is one of the more congested roads here: trips take 39% longer than at free-flow speed, against 13% county-wide.

4I 275Motorway · 23,974vehicles6,312trucks · 26.3%
Road class
Motorway
Congestion ratio
20.3%
Median trip time
48.0 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$80,279

I 275 carries through traffic: the median trip using it lasts 48.0 minutes, against 32.7 for the county.

5Monroe StreetSecondary road · 21,904vehicles769trucks · 3.5%
Road class
Secondary road
Congestion ratio
52.1%
Median trip time
29.8 min
Drivers’ median age
49.3 yrs
Drivers’ average income
$70,137

Delays build on Monroe Street: its congestion ratio of 52% over free-flow time is well above the county's 13%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 75Motorway · #2 by traffic46,380vehicles12,195trucks · 26.3%
2Detroit-Toledo ExpresswayMotorway · #1 by traffic50,200vehicles11,440trucks · 22.8%
3US 23Motorway · #3 by traffic41,532vehicles6,545trucks · 15.8%
4I 275Motorway · #4 by traffic23,974vehicles6,312trucks · 26.3%
5US-223Trunk road · 9,147vehicles996trucks · 10.9%
Road class
Trunk road
Congestion ratio
22.6%
Median trip time
38.3 min
Drivers’ median age
49.8 yrs
Drivers’ average income
$80,847

US-223 is busy by local standards, at 85% more than the county average on its busiest stretch; trucks are 10.9% of it, below the county-wide 14.4%.

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

MonroeDepartment 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 Monroe County

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

Need segment-level traffic data?

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