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Traffic heat map of Carroll County, Illinois: 187 miles of roads shaded from blue (light) to red (heavy traffic)

Carroll County, Illinois Traffic Counts

TrafficZoom tracks traffic on 187 road miles in Carroll County, Illinois, divided into 1,266 segments averaging 782 ft. The average road here carries 2,135 vehicles a day, 75% 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 Carroll County, Illinois

Traffic

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

vehicles per day2,135
Trucks

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

8.5%
Average travel time

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

35.2 min
Congestion ratio

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

8.0%
Drivers’ average age

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

52.0 yrs
Drivers’ average income

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

$63,859

A typical monitored road in Carroll County, Illinois sees 2,135 vehicles per day, while its 187 miles of monitored roads together handle 310,090 vehicle-miles traveled per day (≈113 million per year). Trucks are a smaller part of the mix than across Illinois: 8.5% against 10.2%.

Traffic 75% below the Illinois average

At 2,135 vehicles per day, the average monitored road in Carroll carries 75% less traffic than the state average of 8,480, suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Across the whole network, that travel is about 0.1% of Illinois's statewide total. Carroll carries less traffic than 82% of counties in Illinois.

The average trip takes 35.2 minutes, on par with the state level. 75% of counties in Illinois have a shorter average travel time than Carroll's 35.2 minutes.

The congestion ratio of 8.0% is 61% 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 Carroll County, Illinois, the peak hour concentrates about 8% of the day's traffic.

Carroll County vs. Illinois Traffic Comparison

The average daily traffic per road sets Carroll County apart: 75% below the Illinois average. Its truck share is also 17% below.

MetricCarroll CountyIllinois averageDifference
Traffic2,1358,480-74.8%
Truck % (Total Traffic)8.5%10.2%-16.6%
Avg. Travel Time35.2 min34.1 min+3.3%

How Carroll County compares

Carroll County moves the least traffic of its nearby counties

Against the 4 nearest areas, Carroll County moves 29.3% of the total daily travel and carries 31.6% less traffic on a typical road; it has the quietest roads of the five. Quieter and more local than the areas around it on both counts: less traffic, and less of what there is arriving by truck.

Carroll 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
Carroll County2,1358.5%310,09035.2 min8.0%
Jo Daviess County, Illinois2,22910.8%485,59433.7 min6.9%
Whiteside County, Illinois3,74112.9%1,256,20034.9 min10.9%
Stephenson County, Illinois2,9798.1%893,93833.9 min10.1%
Ogle County, Illinois3,53216.1%1,600,41731.8 min10.2%
Illinois average8,48010.2%N/A34.1 min20.6%

Carroll County ranked within Illinois

Carroll County sits in the top quarter of the Illinois field on average driver age, at #12 of 102.

Carroll County ranked among 102 county-level areas in Illinois (1 = highest).
MeasureCarroll CountyIllinois rank
Traffic volume (AADT)2,135#84 of 102
Average travel time35.2 min#26 of 102
Average driver income$63,859#81 of 102
Average driver age52.0 yrs#12 of 102

Carroll County ranks #12 of 102 on average driver age but #84 of 102 on average daily traffic volume - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Carroll County, Illinois

On their busiest stretches, the top three roads on this list in Carroll County carry 5,539 vehicles a day on average, 2.6 times the typical road in the county (2,135).

Main Street tops the list with 6,041 vehicles a day, 353 of them trucks (5.8%). Waller Road carries the most trucks on the list, 495 a day (9.3% of its traffic), although it ranks #2 for all traffic.

Trips using Market Street are long: a median of 55.8 minutes against 35.2 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Only named roads are listed. Some unnamed segments, such as ramps or unlabeled carriageways, may carry as much traffic as the roads shown.

Cars and light vehiclesTrucks
1Main StreetPrimary road · 6,041vehicles353trucks · 5.8%
Road class
Primary road
Congestion ratio
19.6%
Median trip time
36.9 min
Drivers’ median age
52.5 yrs
Drivers’ average income
$48,695

Delays build on Main Street: its congestion ratio of 20% over free-flow time is well above the county's 8%.

2Waller RoadPrimary road · 5,341vehicles495trucks · 9.3%
Road class
Primary road
Congestion ratio
12.7%
Median trip time
37.5 min
Drivers’ median age
51.6 yrs
Drivers’ average income
$61,639

At 2.5 times the county average, Waller Road draws drivers from neighborhoods averaging $61,639 in household income.

3Chicago AvenuePrimary road · 5,237vehicles319trucks · 6.1%
Road class
Primary road
Congestion ratio
16.0%
Median trip time
34.0 min
Drivers’ median age
51.5 yrs
Drivers’ average income
$50,996

Travel on Chicago Avenue's busiest stretch runs 16% over free-flow time, against 8% across the county, so expect slower peak hours.

4Viaduct RoadPrimary road · 4,960vehicles374trucks · 7.5%
Road class
Primary road
Congestion ratio
13.9%
Median trip time
36.1 min
Drivers’ median age
52.1 yrs
Drivers’ average income
$51,496

The busiest stretch of Viaduct Road carries 2.3 times the county average; trucks are 7.5% of it, below the county-wide 8.5%.

5Broad StreetPrimary road · 3,759vehicles264trucks · 7.0%
Road class
Primary road
Congestion ratio
9.0%
Median trip time
33.0 min
Drivers’ median age
53.3 yrs
Drivers’ average income
$76,483

Broad Street carries 76% more than the county average on its busiest stretch, where the median trip lasts 33.0 minutes.

Ranked by trucks per day

Only named roads are listed. Some unnamed segments, such as ramps or unlabeled carriageways, may carry as much traffic as the roads shown.

Cars and light vehiclesTrucks
1Waller RoadPrimary road · #2 by traffic5,341vehicles495trucks · 9.3%
2Viaduct RoadPrimary road · #4 by traffic4,960vehicles374trucks · 7.5%
3Market StreetPrimary road · 3,487vehicles367trucks · 10.5%
Road class
Primary road
Median trip time
55.8 min
Drivers’ median age
52.6 yrs
Drivers’ average income
$77,565

At 63% more than the county average, Market Street draws drivers from neighborhoods averaging $77,565 in household income.

4Main StreetPrimary road · #1 by traffic6,041vehicles353trucks · 5.8%
5Chicago AvenuePrimary road · #3 by traffic5,237vehicles319trucks · 6.1%
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

CarrollDepartment 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 Carroll County

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

Need segment-level traffic data?

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