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Traffic heat map of Alexander County, Illinois: 99 miles of roads shaded from blue (light) to red (heavy traffic), busiest on IL 146 and Ken Gray Expressway

Alexander County, Illinois Traffic Counts

Our Alexander County, Illinois traffic data covers 912 road segments over 99 road miles, with an average segment of just 576 ft. Its highways carry the highest truck share of any county in Illinois, 52.5%. 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 Alexander County, Illinois

Traffic

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

vehicles per day2,547
Trucks

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

17.3%
Average travel time

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

43.2 min
Congestion ratio

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

7.3%
Drivers’ average age

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

51.7 yrs
Drivers’ average income

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

$49,823

Our data shows 2,547 vehicles per day on the average road in Alexander County, Illinois, and 243,078 vehicle-miles traveled per day (≈88.7 million per year) across its 99 miles of monitored roads. Freight weighs heavily here: trucks are 17.3% of traffic, against 10.2% across Illinois.

The longest trips of any county in Illinois

Alexander's average daily traffic volume is 70% lower than the state average - 2,547 vehicles per day against 8,480 - suggesting less traffic load per 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. 62% of counties in Illinois see more traffic than Alexander's 2,547 vehicles per day.

The average trip takes 43.2 minutes, 27% higher than the state level. Alexander additionally records the highest average travel time of any county in Illinois - 43.2 minutes.

The congestion ratio of 7.3% is 64% lower, pointing to smoother traffic flow than the state level - delays are rare enough to plan travel times almost to the minute.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Alexander County, Illinois

Trafficvehicles per day3,562
Trucks52.5%
Average travel time48.2 min
Congestion ratio7.5%
Drivers’ average age51.9 yrs
Drivers’ average income$56,868

At 17% of vehicle-miles, highways carry a smaller share of the traffic in Alexander County, Illinois than local roads. The average highway carries 3,562 vehicles per day, 41% more than the average non-highway road in the same area, which carries 2,520 vehicles per day.

With 11% of the road miles (11 miles in 24 segments), highways punch above their length, carrying 41,180 vehicle-miles traveled per day (≈15.0 million per year).

The highest highway truck share of any county in Illinois

Highway truck concentration here runs 203% higher than the state average, at 52.5%. That marks Alexander as a major freight corridor, where highway access is what logistics operators compete on.

By share, Alexander has the highest highway truck concentration in Illinois, at 52.5%. Alexander's highway truck count is lower than 52% of counties in Illinois, at roughly 1,868 trucks per day.

non-highway traffic icon

Non-highway Traffic in Alexander County, Illinois

Trafficvehicles per day2,520
Trucks10.1%
Average travel time43.1 min
Congestion ratio7.3%
Drivers’ average age51.7 yrs
Drivers’ average income$49,452

Local roads carry the vast majority of travel in Alexander County, Illinois, 83% of all vehicle-miles. A typical local road sees 2,520 vehicles per day.

Their share of road miles is similar, 89% (88 miles in 888 segments), carrying 201,898 vehicle-miles traveled per day (≈73.7 million per year). Trucks make up 10.1% of non-highway traffic, about 1 in 10 vehicles.

The lowest driver income of any county in Illinois

Compared to highways, non-highway routes see 81% fewer trucks by share.

The non-highway congestion ratio of 7.3% is 64% lower than the state level, suggesting more efficient local mobility than the state average.

Trips here originate from the lowest average driver income in Illinois, at $49,823. Alexander's median driver age is higher than 84% of counties in Illinois.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and PM peak 3:00 PM–6:00 PM, with volumes reaching approximately 76% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 5% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
April–June is the high season, with volumes +11% versus the annual average.
Lowest month:
January is the quietest month, with volumes -34% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Alexander County, Illinois, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +11% in high season.

Alexander County vs. Illinois Traffic Comparison

The highway truck share sets Alexander County apart: 203% above the Illinois average. Its truck share is also 70% above.

MetricAlexander CountyIllinois averageDifference
Traffic2,5478,480-70.0%
Truck % (Total Traffic)17.3%10.2%+70.0%
Truck % (Highway)52.5%17.3%+202.7%
Avg. Travel Time43.2 min34.1 min+26.6%

How Alexander County compares

Alexander County against nearby counties

Compared with its 4 closest neighbours, Alexander County moves 40.3% of the total daily travel; it has the third busiest roads of the five. The same kind of road, just less of it: traffic per road matches the areas around it while the network itself is smaller.

Alexander 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
Alexander County2,54717.3%243,07843.2 min7.3%
Pulaski County, Illinois1,52126.5%377,78036.2 min4.5%
Scott County, Missouri4,24412.1%1,199,07329.6 minN/A
Ballard County, Kentucky1,81610.5%203,63743.4 min10.3%
Union County, Illinois3,22118.1%629,32038.6 min9.2%
Illinois average8,48010.2%N/A34.1 min20.6%

Alexander County ranked within Illinois

Truck share on highways and average travel time: on all 2, Alexander County sits first in Illinois.

Alexander County ranked among 102 county-level areas in Illinois (1 = highest); measures without data in every county rank a smaller field, down to 82.
MeasureAlexander CountyIllinois rank
Traffic volume (AADT)2,547#64 of 102
Highway vehicle-miles per day41,180#80 of 82
Truck share on highways52.5%#1 of 82
Highway trucks per day1,868#43 of 82
Average travel time43.2 min#1 of 102
Average driver income$49,823#102 of 102
Average driver age51.7 yrs#17 of 102

Alexander County ranks #1 of 82 on truck share on highways but #102 of 102 on average driver income - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Alexander County, Illinois

Traffic concentrates on a few corridors: the three busiest roads average 7,947 vehicles a day, against 2,547 on the average road in Alexander County.

IL 146 leads with 9,660 vehicles a day, 808 of them trucks (8.4%). Ken Gray Expressway carries the most trucks, 4,494 a day (53.4% of its traffic), although it ranks #2 for all traffic.

Trucks make up 53.4% of traffic on Ken Gray Expressway and 46.4% on I 57, against 17.3% across all roads in the county.

Drivers on I 57 come from neighborhoods with an average household income of $66,099, 33% above the county average of $49,823.

Few trucks use IL 146: 8.4% of its traffic, under half the county's 17.3%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1IL 146Primary road · 9,660vehicles808trucks · 8.4%
Road class
Primary road
Congestion ratio
12.7%
Median trip time
38.5 min
Drivers’ median age
50.3 yrs
Drivers’ average income
$56,991

The busiest stretch of IL 146 carries 3.8 times the county average; trucks are 8.4% of it, below the county-wide 17.3%.

2Ken Gray ExpresswayMotorway · 8,422vehicles4,494trucks · 53.4%
Road class
Motorway
Congestion ratio
8.5%
Median trip time
48.0 min
Drivers’ median age
51.9 yrs
Drivers’ average income
$56,285

On its busiest stretch, Ken Gray Expressway carries 3.3 times the county average; trucks are 53.4% of it, above the county-wide 17.3%.

3US 51Primary road · 5,759vehicles702trucks · 12.2%
Road class
Primary road
Congestion ratio
8.0%
Median trip time
45.8 min
Drivers’ median age
55.5 yrs
Drivers’ average income
$40,020

US 51 peaks at 5,759 vehicles a day, 2.3 times the county average; trucks are 12.2% of it, below the county-wide 17.3%.

4Illinois State Route 3Primary road · 5,706vehicles502trucks · 8.8%
Road class
Primary road
Congestion ratio
13.4%
Median trip time
41.3 min
Drivers’ median age
50.1 yrs
Drivers’ average income
$60,351

Illinois State Route 3 carries 2.2 times the county average at its busiest, 502 of them trucks (8.8%, below the county-wide 17.3%).

5Sycamore StreetPrimary road · 4,974vehicles769trucks · 15.5%
Road class
Primary road
Congestion ratio
11.2%
Median trip time
51.0 min
Drivers’ median age
55.1 yrs
Drivers’ average income
$40,106

Sycamore Street carries 2.0 times the county average on its busiest stretch, where the median trip lasts 51.0 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Ken Gray ExpresswayMotorway · #2 by traffic8,422vehicles4,494trucks · 53.4%
2I 57Motorway · 4,345vehicles2,017trucks · 46.4%
Road class
Motorway
Congestion ratio
5.1%
Median trip time
50.2 min
Drivers’ median age
51.7 yrs
Drivers’ average income
$66,099

I 57 is busy by local standards, at 71% more than the county average on its busiest stretch; trucks are 46.4% of it, above the county-wide 17.3%.

3IL 146Primary road · #1 by traffic9,660vehicles808trucks · 8.4%
4Sycamore StreetPrimary road · #5 by traffic4,974vehicles769trucks · 15.5%
5US 51Primary road · #3 by traffic5,759vehicles702trucks · 12.2%
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

AlexanderDepartment 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 Alexander County

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

Need segment-level traffic data?

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