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Traffic heat map of Brown County, Illinois: 80 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Main Street and Pittsfield Road

Brown County, Illinois Traffic Counts

Traffic analytics for Brown County, Illinois, calculated from real-world mobile and sensor networks on 994 road segments (80 road miles, about 425 ft each). Its busiest road, Main Street, carries 6,800 vehicles a day, 3.4 times the average road. 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 Volume & Performance in Brown County, Illinois

Traffic

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

vehicles per day1,976
Trucks

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

9.0%
Average travel time

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

33.6 min
Congestion ratio

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

7.4%
Drivers’ average age

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

48.6 yrs
Drivers’ average income

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

$71,299

The average monitored road in Brown County, Illinois carries 1,976 vehicles per day. Across its 80 miles of monitored roads, that adds up to 125,031 vehicle-miles traveled per day (≈45.6 million per year). About 1 in 11 vehicles is a truck, in line with Illinois (10.2%).

Traffic 77% below the Illinois average

Brown's average daily traffic volume is 77% lower than the state average - 1,976 vehicles per day against 8,480 - suggesting less traffic load per road - quiet roads that suit freight movement more than drive-by retail. In total volume terms, its road network carries less than 0.1% of Illinois's statewide total of vehicle-miles. 85% of counties in Illinois see more traffic than Brown's 1,976 vehicles per day.

Journey times here (33.6 minutes on average) closely track the state level. On travel time, Brown runs shorter than 54% of counties in Illinois.

The congestion ratio of 7.4% is 64% lower, pointing to smoother traffic flow than the state level - delays are rare enough to plan travel times almost to the minute.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Brown County, Illinois, the peak hour concentrates about 8% of the day's traffic.

Brown County vs. Illinois Traffic Comparison

The average daily traffic per road sets Brown County apart: 77% below the Illinois average.

MetricBrown CountyIllinois averageDifference
Traffic1,9768,480-76.7%
Truck % (Total Traffic)9.0%10.2%-11.2%
Avg. Travel Time33.6 min34.1 min-1.5%

How Brown County compares

Brown County moves the least traffic of its nearby counties

Compared with its 4 closest neighbours, Brown County moves 27.1% 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.

Brown 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
Brown County1,9769.0%125,03133.6 min7.4%
Schuyler County, Illinois1,3759.4%184,77033.9 min5.9%
Adams County, Illinois4,3367.4%1,164,83733.8 min12.9%
Scott County, Illinois1,58818.4%270,82534.9 min4.7%
Cass County, Illinois1,9868.3%222,52235.8 min6.9%
Illinois average8,48010.2%N/A34.1 min20.6%

Brown County ranked within Illinois

Average daily traffic volume places Brown County #87 of 102 in Illinois - the bottom quarter of the state.

Brown County ranked among 102 county-level areas in Illinois (1 = highest).
MeasureBrown CountyIllinois rank
Traffic volume (AADT)1,976#87 of 102
Average travel time33.6 min#56 of 102
Average driver income$71,299#52 of 102
Average driver age48.6 yrs#62 of 102

Busiest roads in Brown County, Illinois

The three busiest roads in Brown County average 5,699 vehicles a day, 2.9 times the county average of 1,976 across all its monitored roads.

Main Street is the busiest road, at 6,800 vehicles a day, 411 of them trucks (6.0%). Pittsfield Road is practically level with it at 6,606. It also carries the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Main StreetPrimary road · 6,800vehicles411trucks · 6.0%
Road class
Primary road
Congestion ratio
16.0%
Median trip time
32.4 min
Drivers’ median age
49.5 yrs
Drivers’ average income
$70,451

Delays build on Main Street: its congestion ratio of 16% over free-flow time is well above the county's 7%.

2Pittsfield RoadSecondary road · 6,606vehicles364trucks · 5.5%
Road class
Secondary road
Congestion ratio
15.8%
Median trip time
30.2 min
Drivers’ median age
48.8 yrs
Drivers’ average income
$70,897

Travel on Pittsfield Road's busiest stretch runs 16% over free-flow time, against 7% across the county, so expect slower peak hours.

3US 24Primary road · 3,691vehicles345trucks · 9.3%
Road class
Primary road
Congestion ratio
8.9%
Median trip time
32.8 min
Drivers’ median age
48.9 yrs
Drivers’ average income
$68,779

US 24 peaks at 3,691 vehicles a day, 87% more than the county average; trucks are 9.3% of it, in line with the county-wide 9.0%.

4Quincy RoadPrimary road · 3,561vehicles250trucks · 7.0%
Road class
Primary road
Congestion ratio
8.4%
Median trip time
35.5 min
Drivers’ median age
49.4 yrs
Drivers’ average income
$72,008

Quincy Road carries 80% more than the county average at its busiest, 250 of them trucks (7.0%, below the county-wide 9.0%).

5County Road 1080 NPrimary road · 3,182vehicles335trucks · 10.5%
Road class
Primary road
Congestion ratio
7.3%
Median trip time
39.9 min
Drivers’ median age
48.9 yrs
Drivers’ average income
$71,153

County Road 1080 N carries 61% more than the county average on its busiest stretch, where the median trip lasts 39.9 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Main StreetPrimary road · #1 by traffic6,800vehicles411trucks · 6.0%
2Pittsfield RoadSecondary road · #2 by traffic6,606vehicles364trucks · 5.5%
3US 24Primary road · #3 by traffic3,691vehicles345trucks · 9.3%
4County Road 1080 NPrimary road · #5 by traffic3,182vehicles335trucks · 10.5%
5Quincy RoadPrimary road · #4 by traffic3,561vehicles250trucks · 7.0%
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

BrownDepartment 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 Brown County

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

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