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Traffic heat map of Cass County, Illinois: 112 miles of roads shaded from blue (light) to red (heavy traffic), busiest on IL 125 and 15th Street

Cass County, Illinois Traffic Counts

TrafficZoom tracks traffic on 112 road miles in Cass County, Illinois, divided into 1,136 segments averaging 522 ft. The average road here carries 1,986 vehicles a day, 77% less than the Illinois average of 8,480. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Cass County, Illinois

Traffic

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

vehicles per day1,986
Trucks

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

8.3%
Average travel time

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

35.8 min
Congestion ratio

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

6.9%
Drivers’ average age

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

48.6 yrs
Drivers’ average income

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

$67,048

Our data shows 1,986 vehicles per day on the average road in Cass County, Illinois, and 222,522 vehicle-miles traveled per day (≈81.2 million per year) across its 112 miles of monitored roads. Trucks are a smaller part of the mix than across Illinois: 8.3% against 10.2%.

Traffic 77% below the Illinois average

Cass's average daily traffic volume is 77% lower than the state average - 1,986 vehicles per day against 8,480 - suggesting less traffic load per road - very light roads: easy truck access, but little passing trade for roadside retail. In total volume terms, its road network carries less than 0.1% of Illinois's statewide total of vehicle-miles. 84% of counties in Illinois see more traffic than Cass's 1,986 vehicles per day.

At 35.8 minutes, the average travel time matches the state level closely. 80% of counties in Illinois have a shorter average travel time than Cass's 35.8 minutes.

The congestion ratio of 6.9% is 67% lower, pointing to smoother traffic flow than the state level - free-flowing roads make scheduled deliveries highly predictable.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Cass County vs. Illinois Traffic Comparison

The average daily traffic per road sets Cass County apart: 77% below the Illinois average. Its truck share is also 18% below.

MetricCass CountyIllinois averageDifference
Traffic1,9868,480-76.6%
Truck % (Total Traffic)8.3%10.2%-18.2%
Avg. Travel Time35.8 min34.1 min+4.9%

How Cass County compares

Cass County against nearby counties

Nothing in this table sets Cass County sharply apart from the 4 areas nearest to it, though it has the third busiest roads of the five.

Cass County and the 4 nearest county-level areas by centroid distance, with the Illinois average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Cass County1,9868.3%222,52235.8 min6.9%
Morgan County, Illinois3,91211.8%864,71833.4 min10.7%
Schuyler County, Illinois1,3759.4%184,77033.9 min5.9%
Menard County, Illinois2,1807.2%181,45431.6 min7.4%
Brown County, Illinois1,9769.0%125,03133.6 min7.4%
Illinois average8,48010.2%N/A34.1 min20.6%

Cass County ranked within Illinois

Average daily traffic volume places Cass County #86 of 102 in Illinois - the bottom quarter of the state.

Cass County ranked among 102 county-level areas in Illinois (1 = highest).
MeasureCass CountyIllinois rank
Traffic volume (AADT)1,986#86 of 102
Average travel time35.8 min#21 of 102
Average driver income$67,048#69 of 102
Average driver age48.6 yrs#64 of 102

The two ends of this table sit far apart: #21 of 102 on average travel time, against #86 of 102 on average daily traffic volume.

Busiest roads in Cass County, Illinois

The three busiest roads in Cass County average 3,769 vehicles a day, 90% more than the county average of 1,986 across all its monitored roads.

IL 125 leads with 4,064 vehicles a day, 343 of them trucks (8.4%). It tops the truck ranking too, with the most trucks.

15th Street carries longer journeys than most roads here, with a median trip of 59.9 minutes against 35.8 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1IL 125Secondary road · 4,064vehicles343trucks · 8.4%
Road class
Secondary road
Congestion ratio
10.2%
Median trip time
36.5 min
Drivers’ median age
49.7 yrs
Drivers’ average income
$68,883

IL 125 carries 2.0 times the county average at its busiest, 343 of them trucks (8.4%, in line with the county-wide 8.3%).

215th StreetTertiary road · 3,838vehicles249trucks · 6.5%
Road class
Tertiary road
Congestion ratio
8.6%
Median trip time
59.9 min
Drivers’ median age
46.9 yrs
Drivers’ average income
$62,678

15th Street is busy by local standards, at 93% more than the county average on its busiest stretch; trucks are 6.5% of it, below the county-wide 8.3%.

3Grand AvenueTertiary road · 3,405vehicles169trucks · 5.0%
Road class
Tertiary road
Congestion ratio
8.3%
Median trip time
29.2 min
Drivers’ median age
45.7 yrs
Drivers’ average income
$62,301

Grand Avenue peaks at 3,405 vehicles a day, 71% more than the county average; trucks are 5.0% of it, below the county-wide 8.3%.

4Main StreetSecondary road · 3,185vehicles232trucks · 7.3%
Road class
Secondary road
Congestion ratio
8.1%
Median trip time
29.9 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$66,347

Main Street carries 60% more than the county average at its busiest, 232 of them trucks (7.3%, below the county-wide 8.3%).

5US 67Primary road · 2,793vehicles306trucks · 10.9%
Road class
Primary road
Congestion ratio
7.4%
Median trip time
39.0 min
Drivers’ median age
48.1 yrs
Drivers’ average income
$65,663

US 67 carries 41% more than the county average on its busiest stretch, where the median trip lasts 39.0 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1IL 125Secondary road · #1 by traffic4,064vehicles343trucks · 8.4%
2US 67Primary road · #5 by traffic2,793vehicles306trucks · 10.9%
315th StreetTertiary road · #2 by traffic3,838vehicles249trucks · 6.5%
4Main StreetSecondary road · #4 by traffic3,185vehicles232trucks · 7.3%
5Grand AvenueTertiary road · #3 by traffic3,405vehicles169trucks · 5.0%
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

CassDepartment 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 Cass County

The same traffic breakdown for the areas closest to Cass County, Illinois.

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