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Traffic heat map of Logan County, Illinois: 376 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 55 and I 155

Logan County, Illinois Traffic Counts

TrafficZoom tracks traffic on 376 road miles in Logan County, Illinois, divided into 2,615 segments averaging 759 ft. About 1 in 6 vehicles here is a truck, against 1 in 10 across Illinois. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Logan County, Illinois

Traffic

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

vehicles per day2,426
Trucks

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

17.9%
Average travel time

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

37.4 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.

46.6 yrs
Drivers’ average income

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

$76,546

The average monitored road in Logan County, Illinois carries 2,426 vehicles per day. Across its 376 miles of monitored roads, that adds up to 1,416,640 vehicle-miles traveled per day (≈517 million per year). About 1 in 6 vehicles is a truck, well above the 10.2% across Illinois - a freight-heavy mix.

Longer trips than 90% of counties in Illinois

Logan sees 71% lower average daily traffic volume than the state average (2,426 vehicles per day against 8,480), suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 0.6% of Illinois's statewide total. By volume, Logan's 2,426 vehicles per day trails 68% of counties in Illinois.

At 37.4 minutes, the average travel time is 10% higher than the state level. Its average travel time of 37.4 minutes is longer than 90% of counties in Illinois.

At 54% lower than the state level, the 9.5% congestion ratio signals smoother traffic flow - free-flowing roads make scheduled deliveries highly predictable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Logan County, Illinois

Trafficvehicles per day11,066
Trucks22.0%
Average travel time60.7 min
Congestion ratio20.0%
Drivers’ average age45.5 yrs
Drivers’ average income$84,924

Highways carry most of the traffic in Logan County, Illinois: 71% of all vehicle-miles. The average highway carries 11,066 vehicles per day, 447% more than the average non-highway road in the same area, which carries 2,025 vehicles per day.

Yet highways are only 24% of the road network, 88 miles in 116 segments, so each mile of them is 3.0 times as busy as the average road mile.

75% of counties in Illinois move less traffic on their highways.

Freight-heavy highways

The concentration of trucks on highways (22.0%) is 27% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.

60% of counties in Illinois see a lower highway truck share than Logan's 22.0%. 62% of counties in Illinois see fewer highway trucks per day than Logan's roughly 2,439.

non-highway traffic icon

Non-highway Traffic in Logan County, Illinois

Trafficvehicles per day2,025
Trucks7.8%
Average travel time36.3 min
Congestion ratio9.0%
Drivers’ average age47.8 yrs
Drivers’ average income$71,358

Local roads carry a smaller share of travel in Logan County, Illinois, 29% of vehicle-miles; most driving happens on highways. A typical local road sees 2,025 vehicles per day.

Spread over 288 miles and 2,499 segments, 76% of the road network, local roads carry a lighter load per mile: 411,291 vehicle-miles traveled per day (≈150 million per year). The truck share on non-highway roads is 7.8%.

Younger drivers than 85% of counties in Illinois

Compared to highways, non-highway routes see 65% fewer trucks by share.

The non-highway congestion ratio of 9.0% is 56% lower than the state level, suggesting more efficient local mobility than the state average.

Logan's average driver income is higher than 64% of counties in Illinois. The driver population here skews younger than 85% of counties in Illinois.

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 69% higher than the daily average.
Weekend traffic:
Weekend traffic is about as busy as on weekdays (-2%): leisure and through trips largely replace the commute.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +8% versus the annual average.
Lowest month:
January is the quietest month, with volumes -16% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Logan 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.

Logan County vs. Illinois Traffic Comparison

The truck share sets Logan County apart: 76% above the Illinois average. Its average daily traffic per road, by contrast, is 71% below.

MetricLogan CountyIllinois averageDifference
Traffic2,4268,480-71.4%
Truck % (Total Traffic)17.9%10.2%+75.8%
Truck % (Highway)22.0%17.3%+27.2%
Avg. Travel Time37.4 min34.1 min+9.6%

How Logan County compares

Logan County has a higher truck share than any nearby county

Set against the average of the 4 areas nearest to it, Logan County runs 8.7 percentage points more truck traffic; it has the second 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.

Logan 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
Logan County2,42617.9%1,416,64037.4 min9.5%
Menard County, Illinois2,1807.2%181,45431.6 min7.4%
De Witt County, Illinois2,31612.5%489,12034.2 min7.4%
Macon County, Illinois5,3528.0%2,119,63135.2 min15.9%
Mason County, Illinois1,7669.1%236,59741.0 min5.7%
Illinois average8,48010.2%N/A34.1 min20.6%

Logan County ranked within Illinois

Average travel time places Logan County #11 of 102 in Illinois - the top quarter of the state.

Logan County ranked among 102 county-level areas in Illinois (1 = highest); measures without data in every county rank a smaller field, down to 82.
MeasureLogan CountyIllinois rank
Traffic volume (AADT)2,426#70 of 102
Highway vehicle-miles per day1,005,349#21 of 82
Truck share on highways22.0%#33 of 82
Highway trucks per day2,439#32 of 82
Average travel time37.4 min#11 of 102
Average driver income$76,546#37 of 102
Average driver age46.6 yrs#87 of 102

Logan County ranks #11 of 102 on average travel time but #87 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 Logan County, Illinois

The three busiest roads in Logan County average 16,255 vehicles a day, 6.7 times the county average of 2,426 across all its monitored roads.

I 55 leads with 26,375 vehicles a day, 5,992 of them trucks (22.7%). That is 2.2 times the next road, I 155 (12,250). It tops the truck ranking too, with the most trucks.

Trips using I 55 are long: a median of 61.2 minutes against 37.4 county-wide, the mark of a through route.

Few trucks use Keokuk Street: 5.9% of its traffic, under half the county's 17.9%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 55Motorway · 26,375vehicles5,992trucks · 22.7%
Road class
Motorway
Congestion ratio
22.6%
Median trip time
61.2 min
Drivers’ median age
45.3 yrs
Drivers’ average income
$85,970

I 55 is a trunk route for the county, carrying 10.9 times the county average on its busiest stretch; trucks are 22.7% of it, above the county-wide 17.9%.

2I 155Motorway · 12,250vehicles2,183trucks · 17.8%
Road class
Motorway
Congestion ratio
13.9%
Median trip time
55.9 min
Drivers’ median age
47.4 yrs
Drivers’ average income
$79,726

Drivers on I 155 are on long journeys, a median 55.9 minutes against 37.4 county-wide: a through route more than a local street.

3Keokuk StreetPrimary road · 10,139vehicles598trucks · 5.9%
Road class
Primary road
Congestion ratio
24.2%
Median trip time
35.8 min
Drivers’ median age
47.9 yrs
Drivers’ average income
$66,422

Delays build on Keokuk Street: its congestion ratio of 24% over free-flow time is well above the county's 9%.

4Woodlawn RoadPrimary road · 9,943vehicles392trucks · 4.0%
Road class
Primary road
Congestion ratio
30.8%
Median trip time
34.9 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$66,741

Travel on Woodlawn Road's busiest stretch runs 31% over free-flow time, against 9% across the county, so expect slower peak hours.

55th StreetPrimary road · 9,218vehicles380trucks · 4.1%
Road class
Primary road
Congestion ratio
21.4%
Median trip time
38.9 min
Drivers’ median age
46.9 yrs
Drivers’ average income
$66,757

5th Street carries 3.8 times the county average on its busiest stretch, where the median trip lasts 38.9 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 55Motorway · #1 by traffic26,375vehicles5,992trucks · 22.7%
2I 155Motorway · #2 by traffic12,250vehicles2,183trucks · 17.8%
3Keokuk StreetPrimary road · #3 by traffic10,139vehicles598trucks · 5.9%
4Woodlawn RoadPrimary road · #4 by traffic9,943vehicles392trucks · 4.0%
55th StreetPrimary road · #5 by traffic9,218vehicles380trucks · 4.1%
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

LoganDepartment 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 Logan County

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

Need segment-level traffic data?

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