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Traffic heat map of Randolph County, Illinois: 214 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Market Street and Main Street

Randolph County, Illinois Traffic Counts

TrafficZoom tracks traffic on 214 road miles in Randolph County, Illinois, divided into 2,302 segments averaging 491 ft. The average road here carries 3,585 vehicles a day, 58% less than the Illinois average of 8,480. 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 Randolph County, Illinois

Traffic

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

vehicles per day3,585
Trucks

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

7.7%
Average travel time

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

33.8 min
Congestion ratio

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

11.0%
Drivers’ average age

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

50.1 yrs
Drivers’ average income

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

$73,714

A typical monitored road in Randolph County, Illinois sees 3,585 vehicles per day, while its 214 miles of monitored roads together handle 530,328 vehicle-miles traveled per day (≈194 million per year). Trucks are a smaller part of the mix than across Illinois: 7.7% against 10.2%.

Traffic 58% below the Illinois average

Randolph's average daily traffic volume is 58% lower than the state average - 3,585 vehicles per day against 8,480 - suggesting less traffic load per road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Randolph accounts for about 0.2% of Illinois's statewide total of vehicle-miles. 67% of counties in Illinois see less traffic than Randolph's 3,585 vehicles per day.

Journey times here (33.8 minutes on average) closely track the state level. Its average travel time of 33.8 minutes is longer than 53% of counties in Illinois.

At 47% lower than the state level, the 11.0% congestion ratio signals smoother traffic flow - fewer delays make delivery windows more reliable.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Randolph County vs. Illinois Traffic Comparison

Of the four measures, average daily traffic per road differs most: Randolph County runs 58% below the Illinois average. Its truck share is also 24% below.

MetricRandolph CountyIllinois averageDifference
Traffic3,5858,480-57.7%
Truck % (Total Traffic)7.7%10.2%-24.3%
Avg. Travel Time33.8 min34.1 min-0.9%

How Randolph County compares

Randolph County against nearby counties

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

Randolph 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
Randolph County3,5857.7%530,32833.8 min11.0%
Perry County, Missouri3,13013.8%747,96029.7 minN/A
Ste. Genevieve County, Missouri2,75515.8%889,40334.6 min11.5%
Perry County, Illinois3,0548.5%377,76536.1 min8.9%
Jackson County, Illinois3,2956.4%904,75534.3 min8.8%
Illinois average8,48010.2%N/A34.1 min20.6%

Randolph County ranked within Illinois

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

Randolph County ranked among 102 county-level areas in Illinois (1 = highest).
MeasureRandolph CountyIllinois rank
Traffic volume (AADT)3,585#34 of 102
Average travel time33.8 min#48 of 102
Average driver income$73,714#48 of 102
Average driver age50.1 yrs#36 of 102

Busiest roads in Randolph County, Illinois

The three busiest roads in Randolph County average 9,749 vehicles a day, 2.7 times the county average of 3,585 across all its monitored roads.

Market Street is the busiest road, at 10,626 vehicles a day, 528 of them trucks (5.0%). Main Street carries the most trucks, 907 a day (9.1% of its traffic), although it ranks #2 for all traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Market StreetSecondary road · 10,626vehicles528trucks · 5.0%
Road class
Secondary road
Congestion ratio
27.2%
Median trip time
30.8 min
Drivers’ median age
50.1 yrs
Drivers’ average income
$66,249

Delays build on Market Street: its congestion ratio of 27% over free-flow time is well above the county's 11%.

2Main StreetPrimary road · 10,021vehicles907trucks · 9.1%
Road class
Primary road
Congestion ratio
23.7%
Median trip time
33.8 min
Drivers’ median age
50.4 yrs
Drivers’ average income
$79,527

Travel on Main Street's busiest stretch runs 24% over free-flow time, against 11% across the county, so expect slower peak hours.

3Holmes StreetPrimary road · 8,599vehicles552trucks · 6.4%
Road class
Primary road
Median trip time
30.4 min
Drivers’ median age
49.9 yrs
Drivers’ average income
$82,140

Holmes Street peaks at 8,599 vehicles a day, 2.4 times the county average; trucks are 6.4% of it, below the county-wide 7.7%.

4IL 3Primary road · 7,054vehicles601trucks · 8.5%
Road class
Primary road
Congestion ratio
16.8%
Median trip time
35.5 min
Drivers’ median age
49.9 yrs
Drivers’ average income
$85,964

IL 3 carries 2.0 times the county average at its busiest, 601 of them trucks (8.5%, above the county-wide 7.7%).

5Broadway StreetSecondary road · 7,010vehicles444trucks · 6.3%
Road class
Secondary road
Congestion ratio
16.7%
Median trip time
34.7 min
Drivers’ median age
49.0 yrs
Drivers’ average income
$65,381

Broadway Street carries 2.0 times the county average on its busiest stretch, where the median trip lasts 34.7 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Main StreetPrimary road · #2 by traffic10,021vehicles907trucks · 9.1%
2IL 3Primary road · #4 by traffic7,054vehicles601trucks · 8.5%
3Holmes StreetPrimary road · #3 by traffic8,599vehicles552trucks · 6.4%
4Market StreetSecondary road · #1 by traffic10,626vehicles528trucks · 5.0%
5State StreetPrimary road · 6,406vehicles454trucks · 7.1%
Road class
Primary road
Median trip time
33.5 min
Drivers’ median age
49.6 yrs
Drivers’ average income
$77,839

State Street carries 79% more than the county average at its busiest, 454 of them trucks (7.1%, below the county-wide 7.7%).

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

RandolphDepartment 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 Randolph County

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

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