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Traffic heat map of Lake County, Illinois: 1,096 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Tri-State Tollway and I 41

Lake County, Illinois Traffic Counts

Our Lake County, Illinois traffic data covers 31,250 road segments over 1,096 road miles, with an average segment of just 185 ft. Its drivers come from the highest-income neighborhoods of any county in Illinois, averaging $129,334. 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 Lake County, Illinois

Traffic

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

vehicles per day11,336
Trucks

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

6.7%
Average travel time

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

33.7 min
Congestion ratio

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

27.2%
Drivers’ average age

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

47.1 yrs
Drivers’ average income

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

$129,334

A typical monitored road in Lake County, Illinois sees 11,336 vehicles per day, while its 1,096 miles of monitored roads together handle 14,037,462 vehicle-miles traveled per day (≈5.1 billion per year). Trucks are a smaller part of the mix than across Illinois: 6.7% against 10.2%.

Busier roads than 98% of counties in Illinois

At 11,336 vehicles per day, the average monitored road in Lake carries 34% more traffic than the state average of 8,480, suggesting more demand on each road - a busier backdrop for retail sites, at the cost of slower access. In total volume terms, its road network carries about 5.9% of Illinois's statewide total of vehicle-miles. Lake carries more traffic than 98% of counties in Illinois.

The average trip takes 33.7 minutes, on par with the state level. Its average travel time of 33.7 minutes is shorter than 52% of counties in Illinois.

The congestion ratio of 27.2% is 32% higher, pointing to more pronounced congestion than the state level - a factor for delivery windows and signal timing.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Lake County, Illinois

Trafficvehicles per day24,436
Trucks13.8%
Average travel time47.3 min
Congestion ratio39.9%
Drivers’ average age47.4 yrs
Drivers’ average income$129,416

Highways carry a smaller share of travel in Lake County, Illinois, 23% of vehicle-miles; most driving happens on local roads. The average highway carries 24,436 vehicles per day, 120% more than the average non-highway road in the same area, which carries 11,128 vehicles per day.

With 10% of the road miles (111 miles in 488 segments), highways punch above their length, carrying 3,268,588 vehicle-miles traveled per day (≈1.2 billion per year).

By highway travel volume, that ranks Lake in the top 5 counties in Illinois.

More highway trucks than 91% of counties in Illinois

The concentration of trucks on highways (13.8%) is 20% lower than the state average for similar road classifications. Trucks are a small share of a very large highway flow, so Lake still moves heavy freight volumes alongside its passenger traffic.

Lake's highway truck share (13.8%) is lower than 75% of counties in Illinois. 91% of counties in Illinois see fewer highway trucks per day than Lake's roughly 3,372.

non-highway traffic icon

Non-highway Traffic in Lake County, Illinois

Trafficvehicles per day11,128
Trucks4.5%
Average travel time33.5 min
Congestion ratio27.0%
Drivers’ average age47.1 yrs
Drivers’ average income$129,321

Local roads carry most of the traffic in Lake County, Illinois: 77% of all vehicle-miles. On the average non-highway road, that comes to 11,128 vehicles per day.

Their share of road miles is similar, 90% (985 miles in 30,762 segments), carrying 10,768,874 vehicle-miles traveled per day (≈3.9 billion per year). Trucks make up 4.5% of non-highway traffic, about 1 in 22 vehicles.

The highest driver income of any county in Illinois

The concentration of trucks on non-highway roads is 67% lower than on highways.

Non-highway congestion (27.0%) runs 31% higher than the state average, pointing to slower local traffic flow.

At $129,334, the average driver income for trips originating here is the highest in Illinois. 79% of counties in Illinois have an older driver population than Lake.

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 73% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 21% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +8% versus the annual average.
Lowest month:
January is the quietest month, with volumes -14% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Lake County, Illinois, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +8% in high season.

Lake County vs. Illinois Traffic Comparison

Lake County's biggest difference from the Illinois average is its truck share, 34% below it. Its average daily traffic per road, by contrast, is 34% above.

MetricLake CountyIllinois averageDifference
Traffic11,3368,480+33.7%
Truck % (Total Traffic)6.7%10.2%-34.3%
Truck % (Highway)13.8%17.3%-20.4%
Avg. Travel Time33.7 min34.1 min-1.2%

How Lake County compares

Lake County against nearby counties

Set against the average of the 4 areas nearest to it, Lake County is 35.2% more congested; it has the second busiest roads of the five. Bigger and busier at once: more road than the areas around it and heavier traffic on it, which makes it the centre of gravity for travel in this part of the map.

Lake 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
Lake County11,3366.7%14,037,46233.7 min27.2%
Kenosha County, Wisconsin5,4309.2%3,608,43132.3 min15.1%
McHenry County, Illinois9,1886.8%5,331,10434.3 min24.0%
Racine County, Wisconsin5,2849.5%3,644,42632.1 min14.0%
DuPage County, Illinois15,2716.7%17,222,15333.2 min27.4%
Illinois average8,48010.2%N/A34.1 min20.6%

Lake County ranked within Illinois

Lake County posts the highest average driver income of any county-level area in Illinois.

Lake County ranked among 102 county-level areas in Illinois (1 = highest); measures without data in every county rank a smaller field, down to 82.
MeasureLake CountyIllinois rank
Traffic volume (AADT)11,336#3 of 102
Highway vehicle-miles per day3,268,588#4 of 82
Truck share on highways13.8%#62 of 82
Highway trucks per day3,372#8 of 82
Average travel time33.7 min#53 of 102
Average driver income$129,334#1 of 102
Average driver age47.1 yrs#80 of 102

Lake County ranks #1 of 102 on average driver income but #80 of 102 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Lake County, Illinois

The three busiest roads in Lake County average 63,882 vehicles a day, 5.6 times the county average of 11,336 across all its monitored roads.

Tri-State Tollway leads with 88,924 vehicles a day, 13,880 of them trucks (15.6%). No other road comes close: I 41, in second place, carries 53,748. It also carries the most trucks.

Freight stands out on I 41 and Tri-State Tollway: trucks are 18.0% and 15.6% of the traffic there, against 6.7% county-wide.

Trips using I 41 are long: a median of 54.7 minutes against 33.7 county-wide, the mark of a through route.

Drivers on Skokie Highway come from neighborhoods with an average household income of $163,646, 27% above the county average of $129,334.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Tri-State TollwayMotorway · 88,924vehicles13,880trucks · 15.6%
Road class
Motorway
Congestion ratio
51.3%
Median trip time
51.0 min
Drivers’ median age
47.5 yrs
Drivers’ average income
$128,322

Drivers on Tri-State Tollway are on long journeys, a median 51.0 minutes against 33.7 county-wide: a through route more than a local street.

2I 41Motorway · 53,748vehicles9,689trucks · 18.0%
Road class
Motorway
Congestion ratio
24.2%
Median trip time
54.7 min
Drivers’ median age
46.5 yrs
Drivers’ average income
$115,605

On its busiest stretch, I 41 carries 4.7 times the county average; trucks are 18.0% of it, above the county-wide 6.7%.

3Skokie Valley RoadTrunk road · 48,974vehicles3,095trucks · 6.3%
Road class
Trunk road
Congestion ratio
55.4%
Median trip time
38.1 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$160,393

Skokie Valley Road is one of the more congested roads here: trips take 55% longer than at free-flow speed, against 27% county-wide.

4IL 83Primary road · 47,840vehicles2,418trucks · 5.0%
Road class
Primary road
Congestion ratio
55.4%
Median trip time
32.0 min
Drivers’ median age
47.2 yrs
Drivers’ average income
$141,886

Delays build on IL 83: its congestion ratio of 55% over free-flow time is well above the county's 27%.

5Skokie HighwayMotorway · 47,111vehicles4,197trucks · 8.9%
Road class
Motorway
Congestion ratio
34.4%
Median trip time
39.4 min
Drivers’ median age
49.7 yrs
Drivers’ average income
$163,646

Skokie Highway peaks at 47,111 vehicles a day, 4.2 times the county average; trucks are 8.9% of it, above the county-wide 6.7%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Tri-State TollwayMotorway · #1 by traffic88,924vehicles13,880trucks · 15.6%
2I 41Motorway · #2 by traffic53,748vehicles9,689trucks · 18.0%
3Skokie HighwayMotorway · #5 by traffic47,111vehicles4,197trucks · 8.9%
4Skokie Valley RoadTrunk road · #3 by traffic48,974vehicles3,095trucks · 6.3%
5Rand RoadPrimary road · 46,406vehicles2,990trucks · 6.4%
Road class
Primary road
Congestion ratio
48.9%
Median trip time
38.1 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$128,265

Rand Road carries 4.1 times the county average at its busiest, 2,990 of them trucks (6.4%, in line with the county-wide 6.7%).

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

LakeDepartment 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 Lake County

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

Need segment-level traffic data?

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