This page delivers traffic analytics for St. Clair County, Michigan. Our metrics are calculated with multi-sourced, cross-verified data from real-world mobile and sensor networks, and averaged for St. Clair County, Michigan among 522 road miles divided in 12,500 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 220 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.
5,977
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
6.8%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
31.7 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.
15.2%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
50.2 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$76,256
Our data indicates an estimated average traffic volume of 5,977 vehicles per day in St. Clair County, Michigan that results in 3,177,953 vehicle-miles traveled per day (≈1.2 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 31.7 minutes, which already accounts for delays at signals, intersections, and congestion.
Analytical insight
When compared to the Michigan state averages: St. Clair's average daily traffic volume is 22% lower than the state average - 5,977 vehicles per day against 7,697 - suggesting less traffic load per road, a critical factor for logistics and site planning. In total volume terms, its road network carries 3,177,953 vehicle-miles traveled per day (≈1.2 billion per year), about 1.4% of Michigan's statewide total. At 31.7 minutes, the average travel time is 5% lower than the state level. The congestion ratio of 15.2% is 17% lower, pointing to smoother traffic flow than the state level - crucial for traffic control improvement and logistics planning. St. Clair carries more traffic than 85% of counties in Michigan. On travel time, St. Clair runs longer than 21% of counties in Michigan.
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.
8,155
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
11.2%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
35.8 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.
25.3%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
49.6 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$77,485
A significant volume of traffic in St. Clair County, Michigan utilizes the highway network. The average highway carries 8,155 vehicles per day, 37% more than the average non-highway road in the same area, which carries 5,941 vehicles per day. That average covers 112 highway road miles divided in 203 segments (average segment length 2,905 ft), together carrying 1,016,446 vehicle-miles traveled per day (≈371 million per year). 70% of counties in Michigan move less traffic on their highways. Trucks constitute 11.2% of highway traffic.
Analytical insight
At 11.2%, highway truck share is 6% lower than the state average, marking St. Clair as a primarily local traffic hub - underscoring the importance of local access for logistics operators. St. Clair's highway truck share (11.2%) is higher than 51% of counties in Michigan. By raw truck volume, St. Clair carries more highway trucks than 55% of counties in Michigan.
Non-highway traffic
Traffic
Traffic
The average number of vehicles that travel each day over any road in the road network.
5,941
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
4.7%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
31.7 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.
15.1%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
50.3 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$75,910
The non-highway road network in St. Clair County, Michigan supports a substantial volume of traffic. The average non-highway road carries 5,941 vehicles per day, 27% less than the average highway in the same area, which carries 8,155 vehicles per day. That average covers 410 non-highway road miles divided in 12,297 segments (average segment length 176 ft), together carrying 2,161,507 vehicle-miles traveled per day (≈789 million per year). Trucks constitute 4.7% of non-highway traffic.
Analytical insight
Non-highway roads carry a truck concentration that's 59% lower than the highway network. Non-highway congestion (15.1%) runs 17% lower than the state average, pointing to smoother local traffic flow. Overall, average travel time here is longer than 21% of counties in Michigan. St. Clair's average driver income exceeds 77% of counties in Michigan. St. Clair's median driver age is higher than 46% of counties in Michigan.
Time-of-Day & Seasonal Patterns
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–8:00 AM and PM peak 4:00 PM–6:00 PM, with volumes reaching approximately 80% higher than the daily average.
Weekend traffic:
Weekend volumes run about 20% below weekday levels.
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +11% versus the annual average.
Lowest month:
January is the quietest month, with volumes -15% versus the annual average.
Analytical insight
In St. Clair County, Michigan, the peak hour concentrates about 7% of the day's traffic, and seasonal swing is pronounced at +11% in high season.
Traffic Flow Profile Comparison
Metric
St. Clair
Michigan
Average
Difference
Traffic
5,977
7,697
-22.3%
Truck % (Total Traffic)
6.8%
7.7%
-12.2%
Truck % (Highway)
11.2%
12.0%
-6.3%
Avg. Travel Time
31.7 min
33.6 min
-5.5%
Frequently Asked Questions
The average daily traffic volume is calculated at 5,977 vehicles per day, providing a baseline for daily operations and site assessment.
St. Clair carries more traffic than 85% of counties in Michigan, averaging 5,977 vehicles per day.
The average travel time for drivers is 31.7 minutes, offering a standard metric for commute and delivery route planning.
Weekday peaks occur between 7:00 AM and 8:00 AM in the morning and between 4:00 PM and 6:00 PM in the evening - about 80% above the daily average.
Traffic volumes are typically 11% higher during June–August. Volumes drop to their lowest levels in January, averaging 5,078 vehicles per day - a 15% decrease from the annual average.
Drivers on St. Clair roads have a median age of 50 years, and the median household income of the neighborhoods trips originate from averages $76,256 - useful context for retail siting and customer profiling.
Trucks account for approximately 6.8% of the total traffic mix across all road types, with a significantly higher concentration of 11.2% on highways.
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)
