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Traffic heat map of Winnebago County, Illinois: 823 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 39

Winnebago County, Illinois Traffic Counts

Traffic analytics for Winnebago County, Illinois, calculated from real-world mobile and sensor networks on 14,959 road segments (823 road miles, about 291 ft each). Its busiest road, I 39, carries 53,692 vehicles a day, 8.3 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 Winnebago County, Illinois

Traffic

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

vehicles per day6,473
Trucks

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

9.7%
Average travel time

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

34.9 min
Congestion ratio

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

19.3%
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.

$81,056

The average monitored road in Winnebago County, Illinois carries 6,473 vehicles per day. Across its 823 miles of monitored roads, that adds up to 5,336,855 vehicle-miles traveled per day (≈1.9 billion per year). Trucks are 9.7% of traffic, close to the 10.2% across Illinois.

Busier roads than 88% of counties in Illinois

Winnebago's average daily traffic volume is 24% lower than the state average - 6,473 vehicles per day against 8,480 - suggesting less traffic load per road - a factor worth weighing in site selection and logistics planning. In total volume terms, its road network carries about 2.2% of Illinois's statewide total of vehicle-miles. By volume, Winnebago's 6,473 vehicles per day outpaces 88% of counties in Illinois.

The average trip takes 34.9 minutes, on par with the state level. 72% of counties in Illinois have a shorter average travel time than Winnebago's 34.9 minutes.

The congestion ratio of 19.3% runs slightly lower than the state level (6% lower).

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Winnebago County, Illinois

Trafficvehicles per day13,132
Trucks20.4%
Average travel time46.1 min
Congestion ratio25.8%
Drivers’ average age49.8 yrs
Drivers’ average income$87,688

Highways carry a smaller share of travel in Winnebago County, Illinois, 30% of vehicle-miles; most driving happens on local roads. The average highway carries 13,132 vehicles per day, 107% more than the average non-highway road in the same area, which carries 6,352 vehicles per day.

With 13% of the road miles (106 miles in 267 segments), highways punch above their length, carrying 1,595,714 vehicle-miles traveled per day (≈582 million per year).

By highway travel volume, Winnebago outranks 86% of counties in Illinois.

More highway trucks than 77% of counties in Illinois

The concentration of trucks on highways (20.4%) is 18% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.

51% of counties in Illinois see a lower highway truck share than Winnebago's 20.4%. By raw truck volume, Winnebago carries more highway trucks than 77% of counties in Illinois.

non-highway traffic icon

Non-highway Traffic in Winnebago County, Illinois

Trafficvehicles per day6,352
Trucks5.1%
Average travel time34.7 min
Congestion ratio19.2%
Drivers’ average age48.5 yrs
Drivers’ average income$79,887

Most travel in Winnebago County, Illinois happens on local roads, 70% of all vehicle-miles. A typical local road sees 6,352 vehicles per day.

Their share of road miles is similar, 87% (717 miles in 14,692 segments), carrying 3,741,142 vehicle-miles traveled per day (≈1.4 billion per year). Trucks make up 5.1% of non-highway traffic, about 1 in 20 vehicles.

Drivers from higher-income areas than 76% of counties in Illinois

Compared to highways, non-highway routes see 75% fewer trucks by share.

Non-highway congestion (19.2%) runs slightly lower than the state level (7% lower).

Trip origins here have higher average income than 76% of counties in Illinois. 61% of counties in Illinois have an older driver population than Winnebago.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 7:00 AM to 12:00 PM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 76% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 8% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +10% 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 Winnebago County, Illinois, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +10% in high season.

Winnebago County vs. Illinois Traffic Comparison

Of the four measures, average daily traffic per road differs most: Winnebago County runs 24% below the Illinois average. Its highway truck share, by contrast, is 18% above.

MetricWinnebago CountyIllinois averageDifference
Traffic6,4738,480-23.7%
Truck % (Total Traffic)9.7%10.2%-4.9%
Truck % (Highway)20.4%17.3%+17.5%
Avg. Travel Time34.9 min34.1 min+2.3%

How Winnebago County compares

Winnebago County is more congested than any nearby county

Compared with its 4 closest neighbours, Winnebago County is 73.6% more congested and carries 78.1% more traffic on a typical road; it has the busiest roads of the five. It is where traffic concentrates in this corner of the map - the local bottleneck, with more vehicles per road AND less room to absorb them.

Winnebago 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
Winnebago County6,4739.7%5,336,85534.9 min19.3%
Boone County, Illinois3,85013.3%1,616,46331.2 min12.0%
Rock County, Wisconsin4,17312.3%3,531,63834.1 min12.2%
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%

Winnebago County ranked within Illinois

Average daily traffic volume places Winnebago County #13 of 102 in Illinois - the top quarter of the state.

Winnebago County ranked among 102 county-level areas in Illinois (1 = highest); measures without data in every county rank a smaller field, down to 82.
MeasureWinnebago CountyIllinois rank
Traffic volume (AADT)6,473#13 of 102
Highway vehicle-miles per day1,595,714#12 of 82
Truck share on highways20.4%#41 of 82
Highway trucks per day2,675#20 of 82
Average travel time34.9 min#29 of 102
Average driver income$81,056#25 of 102
Average driver age48.6 yrs#62 of 102

Busiest roads in Winnebago County, Illinois

Traffic concentrates on a few corridors: the three busiest roads average 39,414 vehicles a day, against 6,473 on the average road in Winnebago County.

I 39 leads with 53,692 vehicles a day, 10,197 of them trucks (19.0%). It also carries the most trucks.

Freight stands out on Jane Addams Memorial Tollway and I 39: trucks are 23.9% and 19.0% of the traffic there, against 9.7% county-wide.

Trips using Jane Addams Memorial Tollway are long: a median of 51.0 minutes against 34.9 county-wide, the mark of a through route.

Few trucks use State Street: 3.8% of its traffic, under half the county's 9.7%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 39Motorway · 53,692vehicles10,197trucks · 19.0%
Road class
Motorway
Congestion ratio
61.2%
Median trip time
45.9 min
Drivers’ median age
49.5 yrs
Drivers’ average income
$85,263

Delays build on I 39: its congestion ratio of 61% over free-flow time is well above the county's 19%.

2Jane Addams Memorial TollwayMotorway · 37,214vehicles8,876trucks · 23.9%
Road class
Motorway
Congestion ratio
33.7%
Median trip time
51.0 min
Drivers’ median age
49.4 yrs
Drivers’ average income
$94,229

At 5.7 times the county average, Jane Addams Memorial Tollway draws drivers from neighborhoods averaging $94,229 in household income.

3State StreetPrimary road · 27,336vehicles1,039trucks · 3.8%
Road class
Primary road
Congestion ratio
59.7%
Median trip time
38.7 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$72,035

Travel on State Street's busiest stretch runs 60% over free-flow time, against 19% across the county, so expect slower peak hours.

4Alpine RoadSecondary road · 24,803vehicles1,106trucks · 4.5%
Road class
Secondary road
Congestion ratio
30.9%
Median trip time
32.0 min
Drivers’ median age
49.1 yrs
Drivers’ average income
$68,471

On its busiest stretch, Alpine Road carries 3.8 times the county average; trucks are 4.5% of it, below the county-wide 9.7%.

5US 20Motorway · 24,710vehicles3,703trucks · 15.0%
Road class
Motorway
Congestion ratio
26.0%
Median trip time
37.6 min
Drivers’ median age
50.9 yrs
Drivers’ average income
$82,448

A freight route: trucks are 15.0% of the traffic on US 20's busiest stretch, 1.5 times the county-wide 9.7%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 39Motorway · #1 by traffic53,692vehicles10,197trucks · 19.0%
2Jane Addams Memorial TollwayMotorway · #2 by traffic37,214vehicles8,876trucks · 23.9%
3US 20Motorway · #5 by traffic24,710vehicles3,703trucks · 15.0%
4State RoadMotorway · 16,271vehicles1,918trucks · 11.8%
Road class
Motorway
Congestion ratio
19.0%
Median trip time
38.8 min
Drivers’ median age
50.9 yrs
Drivers’ average income
$83,640

State Road peaks at 16,271 vehicles a day, 2.5 times the county average; trucks are 11.8% of it, above the county-wide 9.7%.

5Main StreetPrimary road · 13,378vehicles1,242trucks · 9.3%
Road class
Primary road
Congestion ratio
29.5%
Median trip time
34.5 min
Drivers’ median age
48.4 yrs
Drivers’ average income
$63,378

Main Street carries 2.1 times the county average at its busiest, 1,242 of them trucks (9.3%, in line with the county-wide 9.7%).

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

WinnebagoDepartment 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 Winnebago County

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

Need segment-level traffic data?

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