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Traffic heat map of Montgomery County, Illinois: 288 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 55 and Union Avenue

Montgomery County, Illinois Traffic Counts

About 1 in 6 vehicles here is a truck, against 1 in 10 across Illinois. This page breaks down traffic in Montgomery County, Illinois across 288 miles of monitored roads split into 2,468 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
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 Montgomery County, Illinois

Traffic

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

vehicles per day2,802
Trucks

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

15.6%
Average travel time

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

33.1 min
Congestion ratio

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

9.5%
Drivers’ average age

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

50.3 yrs
Drivers’ average income

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

$74,825

Our data shows 2,802 vehicles per day on the average road in Montgomery County, Illinois, and 1,134,009 vehicle-miles traveled per day (≈414 million per year) across its 288 miles of monitored roads. About 1 in 6 vehicles is a truck, well above the 10.2% across Illinois - a freight-heavy mix.

Traffic 67% below the Illinois average

At 2,802 vehicles per day, the average monitored road in Montgomery carries 67% 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 0.5% of Illinois's statewide total. By volume, Montgomery's 2,802 vehicles per day trails 53% of counties in Illinois.

Journey times here (33.1 minutes on average) closely track the state level. On travel time, Montgomery runs shorter than 61% of counties in Illinois.

The congestion ratio of 9.5% is 54% 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 Montgomery County, Illinois

Trafficvehicles per day10,689
Trucks20.4%
Average travel time62.5 min
Congestion ratio23.7%
Drivers’ average age47.9 yrs
Drivers’ average income$86,731

A little more than half of the driving in Montgomery County, Illinois happens on highways: 63% of all vehicle-miles. The average highway carries 10,689 vehicles per day, 298% more than the average non-highway road in the same area, which carries 2,688 vehicles per day.

Yet highways are only 20% of the road network, 58 miles in 35 segments, so each mile of them is 3.1 times as busy as the average road mile.

64% of counties in Illinois move less traffic on their highways.

Freight-heavy highways

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.

Montgomery's highway truck share (20.4%) is higher than 52% of counties in Illinois. Montgomery's highway truck count is higher than 63% of counties in Illinois, at roughly 2,182 trucks per day.

non-highway traffic icon

Non-highway Traffic in Montgomery County, Illinois

Trafficvehicles per day2,688
Trucks7.6%
Average travel time32.7 min
Congestion ratio9.3%
Drivers’ average age51.0 yrs
Drivers’ average income$68,030

A significant share of driving in Montgomery County, Illinois, 37% of vehicle-miles, happens on local roads. A typical local road sees 2,688 vehicles per day.

Local roads make up 80% of the monitored road miles (230 miles in 2,433 segments) but carry less than their share of travel: 421,502 vehicle-miles traveled per day (≈154 million per year). Trucks make up 7.6% of non-highway traffic, about 1 in 13 vehicles.

Local congestion 55% below the Illinois average

Compared to highways, non-highway routes see 63% fewer trucks by share.

At 55% lower than the state level, the non-highway congestion ratio of 9.3% signals easier movement on local roads.

57% of counties in Illinois see lower average driver income among trip origins than Montgomery. 68% of counties in Illinois have a younger driver population than Montgomery.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Montgomery County, Illinois, the peak hour concentrates about 7% of the day's traffic.

Montgomery County vs. Illinois Traffic Comparison

Of the four measures, average daily traffic per road differs most: Montgomery County runs 67% below the Illinois average. Its truck share, by contrast, is 54% above.

MetricMontgomery CountyIllinois averageDifference
Traffic2,8028,480-67.0%
Truck % (Total Traffic)15.6%10.2%+53.6%
Truck % (Highway)20.4%17.3%+17.8%
Avg. Travel Time33.1 min34.1 min-2.8%

How Montgomery County compares

Montgomery County against nearby counties

Nothing in this table sets Montgomery County sharply apart from the 4 areas nearest to it, though it has the second busiest roads of the five.

Montgomery 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
Montgomery County2,80215.6%1,134,00933.1 min9.5%
Christian County, Illinois3,0928.6%655,09634.2 min9.7%
Bond County, Illinois2,27723.2%740,17129.1 min7.6%
Macoupin County, Illinois2,80112.5%988,57732.1 min8.1%
Fayette County, Illinois2,63324.5%1,175,89033.9 min8.0%
Illinois average8,48010.2%N/A34.1 min20.6%

Montgomery County ranked within Illinois

Montgomery County sits close to the Illinois median on every measure below - no single figure sets it apart from the state as a whole.

Montgomery County ranked among 102 county-level areas in Illinois (1 = highest); measures without data in every county rank a smaller field, down to 82.
MeasureMontgomery CountyIllinois rank
Traffic volume (AADT)2,802#55 of 102
Highway vehicle-miles per day712,507#30 of 82
Truck share on highways20.4%#40 of 82
Highway trucks per day2,182#31 of 82
Average travel time33.1 min#63 of 102
Average driver income$74,825#44 of 102
Average driver age50.3 yrs#33 of 102

Busiest roads in Montgomery County, Illinois

The three busiest roads in Montgomery County average 15,222 vehicles a day, 5.4 times the county average of 2,802 across all its monitored roads.

I 55 leads with 24,764 vehicles a day, 5,055 of them trucks (20.4%). No other road comes close: Union Avenue, in second place, carries 11,729. It tops the truck ranking too, with the most trucks.

I 55 carries longer journeys than most roads here, with a median trip of 62.5 minutes against 33.1 county-wide.

Few trucks use Union Avenue: 5.2% of its traffic, under half the county's 15.6%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 55Motorway · 24,764vehicles5,055trucks · 20.4%
Road class
Motorway
Congestion ratio
23.7%
Median trip time
62.5 min
Drivers’ median age
47.9 yrs
Drivers’ average income
$86,731

Travel on I 55's busiest stretch runs 24% over free-flow time, against 9% across the county, so expect slower peak hours.

2Union AvenuePrimary road · 11,729vehicles612trucks · 5.2%
Road class
Primary road
Congestion ratio
27.3%
Median trip time
30.4 min
Drivers’ median age
51.6 yrs
Drivers’ average income
$67,258

Union Avenue is one of the more congested roads here: trips take 27% longer than at free-flow speed, against 9% county-wide.

3Main StreetSecondary road · 9,172vehicles478trucks · 5.2%
Road class
Secondary road
Congestion ratio
22.1%
Median trip time
32.7 min
Drivers’ median age
49.5 yrs
Drivers’ average income
$60,634

The busiest stretch of Main Street carries 3.3 times the county average; trucks are 5.2% of it, below the county-wide 15.6%.

4IL 16 / IL 127Primary road · 8,191vehicles714trucks · 8.7%
Road class
Primary road
Congestion ratio
18.5%
Median trip time
36.0 min
Drivers’ median age
50.6 yrs
Drivers’ average income
$65,508

On its busiest stretch, IL 16 / IL 127 carries 2.9 times the county average; trucks are 8.7% of it, below the county-wide 15.6%.

5Springfield RoadPrimary road · 8,162vehicles666trucks · 8.2%
Road class
Primary road
Congestion ratio
19.3%
Median trip time
37.0 min
Drivers’ median age
50.0 yrs
Drivers’ average income
$65,743

Springfield Road peaks at 8,162 vehicles a day, 2.9 times the county average; trucks are 8.2% of it, below the county-wide 15.6%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 55Motorway · #1 by traffic24,764vehicles5,055trucks · 20.4%
2IL 16 / IL 127Primary road · #4 by traffic8,191vehicles714trucks · 8.7%
3Springfield RoadPrimary road · #5 by traffic8,162vehicles666trucks · 8.2%
4Union AvenuePrimary road · #2 by traffic11,729vehicles612trucks · 5.2%
5Illinois Route 16Primary road · 7,008vehicles591trucks · 8.4%
Road class
Primary road
Congestion ratio
16.1%
Median trip time
32.2 min
Drivers’ median age
52.0 yrs
Drivers’ average income
$66,368

Illinois Route 16 carries 2.5 times the county average at its busiest, 591 of them trucks (8.4%, below the county-wide 15.6%).

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

MontgomeryDepartment 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 Montgomery County

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

Need segment-level traffic data?

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