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Traffic heat map of Franklin County, Illinois: 234 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Ken Gray Expressway

Franklin County, Illinois Traffic Counts

Traffic analytics for Franklin County, Illinois, calculated from real-world mobile and sensor networks on 3,566 road segments (234 road miles, about 346 ft each). About 1 in 6 vehicles here is a truck, against 1 in 10 across Illinois. 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 icon

Total Traffic Volume & Performance in Franklin County, Illinois

Traffic

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

vehicles per day3,546
Trucks

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

16.2%
Average travel time

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

33.3 min
Congestion ratio

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

10.5%
Drivers’ average age

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

49.3 yrs
Drivers’ average income

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

$59,620

A typical monitored road in Franklin County, Illinois sees 3,546 vehicles per day, while its 234 miles of monitored roads together handle 1,158,256 vehicle-miles traveled per day (≈423 million per year). Freight weighs heavily here: trucks are 16.2% of traffic, against 10.2% across Illinois.

Traffic 58% below the Illinois average

At 3,546 vehicles per day, the average monitored road in Franklin carries 58% 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. In total volume terms, its road network carries about 0.5% of Illinois's statewide total of vehicle-miles. By volume, Franklin's 3,546 vehicles per day outpaces 66% of counties in Illinois.

At 33.3 minutes, the average travel time matches the state level closely. Its average travel time of 33.3 minutes is shorter than 57% of counties in Illinois.

At 49% lower than the state level, the 10.5% congestion ratio signals smoother traffic flow - travel times are easy to plan around for scheduled deliveries.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Franklin County, Illinois

Trafficvehicles per day14,202
Trucks26.4%
Average travel time47.7 min
Congestion ratio30.5%
Drivers’ average age48.6 yrs
Drivers’ average income$63,157

Highways carry about half of all travel in Franklin County, Illinois, 51% of vehicle-miles. The average highway carries 14,202 vehicles per day, 325% more than the average non-highway road in the same area, which carries 3,344 vehicles per day.

Yet highways are only 16% of the road network, 38 miles in 66 segments, so each mile of them is 3.2 times as busy as the average road mile.

56% of counties in Illinois move less traffic on their highways.

More highway trucks than 93% of counties in Illinois

At 26.4%, highway truck share is 52% higher than the state average. That marks Franklin as a major freight corridor, where highway access is what logistics operators compete on.

78% of counties in Illinois see a lower highway truck share than Franklin's 26.4%. 93% of counties in Illinois see fewer highway trucks per day than Franklin's roughly 3,751.

non-highway traffic icon

Non-highway Traffic in Franklin County, Illinois

Trafficvehicles per day3,344
Trucks5.9%
Average travel time33.0 min
Congestion ratio10.1%
Drivers’ average age49.5 yrs
Drivers’ average income$58,687

Local roads carry about half of all travel in Franklin County, Illinois, 49% of vehicle-miles. On the average non-highway road, that comes to 3,344 vehicles per day.

Spread over 196 miles and 3,500 segments, 84% of the road network, local roads carry a lighter load per mile: 572,582 vehicle-miles traveled per day (≈209 million per year). About 1 in 17 vehicles on non-highway roads is a truck (5.9%).

Drivers from lower-income areas than 92% of counties in Illinois

Compared to highways, non-highway routes see 78% fewer trucks by share.

The non-highway congestion ratio of 10.1% is 51% lower than the state level, suggesting more efficient local mobility than the state average.

Franklin's average driver income is lower than 92% of counties in Illinois. The driver population here skews younger than 56% of counties in Illinois.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–8:00 AM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 65% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 11% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +16% versus the annual average.
Lowest month:
January is the quietest month, with volumes -22% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Franklin County, Illinois, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +16% in high season.

Franklin County vs. Illinois Traffic Comparison

Of the four measures, truck share differs most: Franklin County runs 60% above the Illinois average. Its average daily traffic per road, by contrast, is 58% below.

MetricFranklin CountyIllinois averageDifference
Traffic3,5468,480-58.2%
Truck % (Total Traffic)16.2%10.2%+59.6%
Truck % (Highway)26.4%17.3%+52.4%
Avg. Travel Time33.3 min34.1 min-2.4%

How Franklin County compares

Franklin County against nearby counties

Nothing in this table sets Franklin County sharply apart from the 4 areas nearest to it, though it has the third busiest roads of the five. Traffic volume here matches the areas around it, but more of that traffic is trucks - a difference in what routes through, not in how much.

Franklin 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
Franklin County3,54616.2%1,158,25633.3 min10.5%
Williamson County, Illinois4,50812.7%2,115,22633.1 min12.0%
Hamilton County, Illinois2,3168.5%151,29633.7 min6.8%
Perry County, Illinois3,0548.5%377,76536.1 min8.9%
Jefferson County, Illinois4,93319.7%1,965,53032.5 min12.4%
Illinois average8,48010.2%N/A34.1 min20.6%

Franklin County ranked within Illinois

Franklin County sits in the top quarter of the Illinois field on highway truck volume, at #7 of 82.

Franklin County ranked among 102 county-level areas in Illinois (1 = highest); measures without data in every county rank a smaller field, down to 82.
MeasureFranklin CountyIllinois rank
Traffic volume (AADT)3,546#35 of 102
Highway vehicle-miles per day585,674#37 of 82
Truck share on highways26.4%#19 of 82
Highway trucks per day3,751#7 of 82
Average travel time33.3 min#59 of 102
Average driver income$59,620#94 of 102
Average driver age49.3 yrs#58 of 102

Franklin County ranks #7 of 82 on highway truck volume but #94 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 Franklin County, Illinois

The three busiest roads in Franklin County average 18,253 vehicles a day, 5.1 times the county average of 3,546 across all its monitored roads.

Ken Gray Expressway leads with 31,230 vehicles a day, 8,247 of them trucks (26.4%). That is 2.3 times the next road, Main Street (13,381). It also carries the most trucks.

Logan Street is busy with cars rather than freight: only 3.5% of its traffic is trucks, against 16.2% county-wide.

Trips using Ken Gray Expressway are long: a median of 47.7 minutes against 33.3 county-wide, the mark of a through route.

Freight stands out on Ken Gray Expressway: trucks are 26.4% of the traffic there, against 16.2% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Ken Gray ExpresswayMotorway · 31,230vehicles8,247trucks · 26.4%
Road class
Motorway
Congestion ratio
30.5%
Median trip time
47.7 min
Drivers’ median age
48.6 yrs
Drivers’ average income
$63,157

Delays build on Ken Gray Expressway: its congestion ratio of 31% over free-flow time is well above the county's 10%.

2Main StreetSecondary road · 13,381vehicles557trucks · 4.2%
Road class
Secondary road
Congestion ratio
31.8%
Median trip time
30.7 min
Drivers’ median age
49.6 yrs
Drivers’ average income
$57,676

Travel on Main Street's busiest stretch runs 32% over free-flow time, against 10% across the county, so expect slower peak hours.

3Logan StreetSecondary road · 10,149vehicles357trucks · 3.5%
Road class
Secondary road
Congestion ratio
24.2%
Median trip time
36.1 min
Drivers’ median age
49.1 yrs
Drivers’ average income
$58,389

At 2.9 times the county average, Logan Street draws drivers from neighborhoods averaging $58,389 in household income.

4IL 37Secondary road · 8,791vehicles329trucks · 3.7%
Road class
Secondary road
Congestion ratio
20.4%
Median trip time
32.8 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$59,695

The busiest stretch of IL 37 carries 2.5 times the county average; trucks are 3.7% of it, below the county-wide 16.2%.

5Illinois Route 14Secondary road · 7,516vehicles371trucks · 4.9%
Road class
Secondary road
Congestion ratio
17.9%
Median trip time
31.6 min
Drivers’ median age
49.9 yrs
Drivers’ average income
$56,667

On its busiest stretch, Illinois Route 14 carries 2.1 times the county average; trucks are 4.9% of it, below the county-wide 16.2%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Ken Gray ExpresswayMotorway · #1 by traffic31,230vehicles8,247trucks · 26.4%
2Main StreetSecondary road · #2 by traffic13,381vehicles557trucks · 4.2%
3State StreetSecondary road · 6,116vehicles405trucks · 6.6%
Road class
Secondary road
Congestion ratio
14.4%
Median trip time
31.3 min
Drivers’ median age
51.2 yrs
Drivers’ average income
$54,658

State Street carries 73% more than the county average at its busiest, 405 of them trucks (6.6%, below the county-wide 16.2%).

4Illinois Route 37Secondary road · 5,612vehicles393trucks · 7.0%
Road class
Secondary road
Congestion ratio
13.2%
Median trip time
34.4 min
Drivers’ median age
49.6 yrs
Drivers’ average income
$57,191

Illinois Route 37 carries 58% more than the county average on its busiest stretch, where the median trip lasts 34.4 minutes.

5Illinois Route 14Secondary road · #5 by traffic7,516vehicles371trucks · 4.9%
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

FranklinDepartment 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 Franklin County

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

Need segment-level traffic data?

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