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Traffic heat map of McHenry County, Illinois: 628 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Jane Addams Memorial Tollway

McHenry County, Illinois Traffic Counts

Our McHenry County, Illinois traffic data covers 14,606 road segments over 628 road miles, with an average segment of just 227 ft. Its average highway carries more trucks than in any other county in Illinois, about 4,909 a day. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
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 McHenry County, Illinois

Traffic

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

vehicles per day9,188
Trucks

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

6.8%
Average travel time

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

34.3 min
Congestion ratio

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

24.0%
Drivers’ average age

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

47.7 yrs
Drivers’ average income

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

$110,532

The average monitored road in McHenry County, Illinois carries 9,188 vehicles per day. Across its 628 miles of monitored roads, that adds up to 5,331,104 vehicle-miles traveled per day (≈1.9 billion per year). About 1 in 15 vehicles is a truck, fewer than the 1 in 10 across Illinois.

Busier roads than 95% of counties in Illinois

At 9,188 vehicles per day, the average road in McHenry carries somewhat more traffic than the state average of 8,480 (8% more). In total volume terms, its road network carries about 2.2% of Illinois's statewide total of vehicle-miles. 95% of counties in Illinois see less traffic than McHenry's 9,188 vehicles per day.

At 34.3 minutes, the average travel time matches the state level closely. 67% of counties in Illinois have a shorter average travel time than McHenry's 34.3 minutes.

At 16% higher than the state level, the 24.0% congestion ratio signals more pronounced congestion - relevant for traffic control and delivery planning.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in McHenry County, Illinois

Trafficvehicles per day19,609
Trucks20.0%
Average travel time50.6 min
Congestion ratio31.6%
Drivers’ average age48.6 yrs
Drivers’ average income$96,448

Only a small share of travel in McHenry County, Illinois happens on highways: 11% of vehicle-miles. The average highway carries 19,609 vehicles per day, 114% more than the average non-highway road in the same area, which carries 9,176 vehicles per day.

Highways make up 4% of the monitored road miles (24 miles, 17 segments), so they carry more than their share: 578,552 vehicle-miles traveled per day (≈211 million per year).

53% of counties in Illinois move less traffic on their highways.

The most highway trucks of any county in Illinois

At 20.0%, highway truck share is 15% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

McHenry's highway truck share (20.0%) is lower than 52% of counties in Illinois. At roughly 4,909 trucks per day, McHenry carries the highest volume of highway trucks in Illinois.

non-highway traffic icon

Non-highway Traffic in McHenry County, Illinois

Trafficvehicles per day9,176
Trucks5.2%
Average travel time34.3 min
Congestion ratio24.0%
Drivers’ average age47.7 yrs
Drivers’ average income$111,123

Local roads carry the vast majority of travel in McHenry County, Illinois, 89% of all vehicle-miles. On the average non-highway road, that comes to 9,176 vehicles per day.

Their share of road miles is similar, 96% (604 miles in 14,589 segments), carrying 4,752,552 vehicle-miles traveled per day (≈1.7 billion per year). Trucks make up 5.2% of non-highway traffic, about 1 in 19 vehicles.

Drivers from higher-income areas than 95% of counties in Illinois

Compared to highways, non-highway routes see 74% fewer trucks by share.

The non-highway congestion ratio of 24.0% is 16% higher than the state level, suggesting slower local mobility than the state average.

95% of counties in Illinois see lower average driver income among trip origins than McHenry. 74% of counties in Illinois have an older driver population than McHenry.

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 79% 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:
June–August is the high season, with volumes +7% versus the annual average.
Lowest month:
March is the quietest month, with volumes -11% versus the annual average.

Data Finding: Hourly & Seasonal Patterns

In McHenry County, Illinois, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +7% in high season.

McHenry County vs. Illinois Traffic Comparison

The truck share sets McHenry County apart: 33% below the Illinois average. Its highway truck share, by contrast, is 15% above.

MetricMcHenry CountyIllinois averageDifference
Traffic9,1888,480+8.4%
Truck % (Total Traffic)6.8%10.2%-33.5%
Truck % (Highway)20.0%17.3%+15.3%
Avg. Travel Time34.3 min34.1 min+0.6%

How McHenry County compares

McHenry County against nearby counties

McHenry County tracks the 4 areas around it closely - no measure in this table sets it far apart from the areas immediately next to it, though it has the third busiest roads of the five.

McHenry 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
McHenry County9,1886.8%5,331,10434.3 min24.0%
Boone County, Illinois3,85013.3%1,616,46331.2 min12.0%
Lake County, Illinois11,3366.7%14,037,46233.7 min27.2%
Kane County, Illinois10,8057.7%9,913,01633.2 min25.7%
Kenosha County, Wisconsin5,4309.2%3,608,43132.3 min15.1%
Illinois average8,48010.2%N/A34.1 min20.6%

McHenry County ranked within Illinois

No other county-level area in Illinois records a higher highway truck volume than McHenry County.

McHenry County ranked among 102 county-level areas in Illinois (1 = highest); measures without data in every county rank a smaller field, down to 82.
MeasureMcHenry CountyIllinois rank
Traffic volume (AADT)9,188#6 of 102
Highway vehicle-miles per day578,552#39 of 82
Truck share on highways20.0%#43 of 82
Highway trucks per day3,920#1 of 82
Average travel time34.3 min#34 of 102
Average driver income$110,532#6 of 102
Average driver age47.7 yrs#76 of 102

Busiest roads in McHenry County, Illinois

The three busiest roads in McHenry County average 40,715 vehicles a day, 4.4 times the county average of 9,188 across all its monitored roads.

Jane Addams Memorial Tollway leads with 47,999 vehicles a day, 9,595 of them trucks (20.0%). It also carries the most trucks.

Trucks make up 20.0% of traffic on Jane Addams Memorial Tollway, against 6.8% across all roads in the county.

Jane Addams Memorial Tollway carries longer journeys than most roads here, with a median trip of 50.8 minutes against 34.3 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Jane Addams Memorial TollwayMotorway · 47,999vehicles9,595trucks · 20.0%
Road class
Motorway
Congestion ratio
32.5%
Median trip time
50.8 min
Drivers’ median age
48.6 yrs
Drivers’ average income
$96,448

Jane Addams Memorial Tollway carries 5.2 times the county average on its busiest stretch, where the median trip lasts 50.8 minutes.

2Algonquin RoadPrimary road · 40,634vehicles1,799trucks · 4.4%
Road class
Primary road
Congestion ratio
76.4%
Median trip time
33.4 min
Drivers’ median age
47.3 yrs
Drivers’ average income
$113,722

Travel on Algonquin Road's busiest stretch runs 76% over free-flow time, against 24% across the county, so expect slower peak hours.

3IL 31Primary road · 33,514vehicles1,640trucks · 4.9%
Road class
Primary road
Congestion ratio
46.4%
Median trip time
36.2 min
Drivers’ median age
47.3 yrs
Drivers’ average income
$114,842

On its busiest stretch, IL 31 carries 3.6 times the county average; trucks are 4.9% of it, below the county-wide 6.8%.

4Randall RoadPrimary road · 33,501vehicles1,276trucks · 3.8%
Road class
Primary road
Congestion ratio
33.3%
Median trip time
30.8 min
Drivers’ median age
47.3 yrs
Drivers’ average income
$118,801

Randall Road peaks at 33,501 vehicles a day, 3.6 times the county average; trucks are 3.8% of it, below the county-wide 6.8%.

5Northwest HighwayPrimary road · 32,338vehicles2,011trucks · 6.2%
Road class
Primary road
Congestion ratio
39.8%
Median trip time
31.6 min
Drivers’ median age
47.9 yrs
Drivers’ average income
$127,168

Northwest Highway carries 3.5 times the county average at its busiest, 2,011 of them trucks (6.2%, below the county-wide 6.8%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1Jane Addams Memorial TollwayMotorway · #1 by traffic47,999vehicles9,595trucks · 20.0%
2Northwest HighwayPrimary road · #5 by traffic32,338vehicles2,011trucks · 6.2%
3Main StreetPrimary road · 28,043vehicles1,867trucks · 6.7%
Road class
Primary road
Congestion ratio
52.6%
Median trip time
30.2 min
Drivers’ median age
50.6 yrs
Drivers’ average income
$92,294

Main Street carries 3.1 times the county average on its busiest stretch, where the median trip lasts 30.2 minutes.

4Algonquin RoadPrimary road · #2 by traffic40,634vehicles1,799trucks · 4.4%
5Front StreetPrimary road · 28,172vehicles1,795trucks · 6.4%
Road class
Primary road
Congestion ratio
66.2%
Median trip time
36.6 min
Drivers’ median age
48.5 yrs
Drivers’ average income
$106,232

Front Street is one of the more congested roads here: trips take 66% longer than at free-flow speed, against 24% county-wide.

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

McHenryDepartment 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 McHenry County

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

Need segment-level traffic data?

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