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Traffic heat map of Mason County, Illinois: 155 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Dearborn Street and Promenade Street

Mason County, Illinois Traffic Counts

Trips here are among the 3 longest of any county in Illinois. This page breaks down traffic in Mason County, Illinois across 155 miles of monitored roads split into 1,470 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 Mason County, Illinois

Traffic

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

vehicles per day1,766
Trucks

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

9.1%
Average travel time

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

41.0 min
Congestion ratio

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

5.7%
Drivers’ average age

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

51.5 yrs
Drivers’ average income

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

$65,654

A typical monitored road in Mason County, Illinois sees 1,766 vehicles per day, while its 155 miles of monitored roads together handle 236,597 vehicle-miles traveled per day (≈86.4 million per year). About 1 in 11 vehicles is a truck, in line with Illinois (10.2%).

Longer trips than 99% of counties in Illinois

Mason's average daily traffic volume is 79% lower than the state average - 1,766 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, Mason accounts for less than 0.1% of Illinois's statewide total of vehicle-miles. 90% of counties in Illinois see more traffic than Mason's 1,766 vehicles per day.

The average trip takes 41.0 minutes, 20% higher than the state level. 99% of counties in Illinois have a shorter average travel time than Mason's 41.0 minutes.

At 72% lower than the state level, the 5.7% congestion ratio signals smoother traffic flow - delays are rare enough to plan travel times almost to the minute.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Mason County vs. Illinois Traffic Comparison

Mason County's biggest difference from the Illinois average is its average daily traffic per road, 79% below it. Its average travel time, by contrast, is 20% above.

MetricMason CountyIllinois averageDifference
Traffic1,7668,480-79.2%
Truck % (Total Traffic)9.1%10.2%-10.7%
Avg. Travel Time41.0 min34.1 min+20.2%

How Mason County compares

Mason County is the least congested of its nearby counties

Against the 4 nearest areas, Mason County moves 23.2% of the total daily travel and is 36.8% less congested; it has the quietest roads of the five. Trips here run longer without running slower: distance, not congestion, is what drivers spend their time on.

Mason 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
Mason County1,7669.1%236,59741.0 min5.7%
Menard County, Illinois2,1807.2%181,45431.6 min7.4%
Fulton County, Illinois2,3137.8%596,75534.2 min7.7%
Tazewell County, Illinois4,8838.2%3,071,95231.4 min14.2%
Cass County, Illinois1,9868.3%222,52235.8 min6.9%
Illinois average8,48010.2%N/A34.1 min20.6%

Mason County ranked within Illinois

Mason County sits in Illinois's top three on average travel time.

Mason County ranked among 102 county-level areas in Illinois (1 = highest).
MeasureMason CountyIllinois rank
Traffic volume (AADT)1,766#92 of 102
Average travel time41.0 min#2 of 102
Average driver income$65,654#74 of 102
Average driver age51.5 yrs#19 of 102

Mason County ranks #2 of 102 on average travel time but #92 of 102 on average daily traffic volume. Some of the longest trips in Illinois on some of its emptiest roads - distance, not congestion, is what sets travel time here.

Busiest roads in Mason County, Illinois

Traffic concentrates on a few corridors: the three busiest roads average 6,632 vehicles a day, against 1,766 on the average road in Mason County.

Dearborn Street leads with 7,043 vehicles a day, 603 of them trucks (8.6%). Scott Wike Lucas Bridge carries the most trucks, 672 a day (10.8% of its traffic), although it ranks #4 for all traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Dearborn StreetPrimary road · 7,043vehicles603trucks · 8.6%
Road class
Primary road
Congestion ratio
22.0%
Median trip time
41.6 min
Drivers’ median age
51.4 yrs
Drivers’ average income
$60,347

Dearborn Street is one of the more congested roads here: trips take 22% longer than at free-flow speed, against 6% county-wide.

2Promenade StreetPrimary road · 6,584vehicles588trucks · 8.9%
Road class
Primary road
Congestion ratio
20.2%
Median trip time
41.1 min
Drivers’ median age
50.8 yrs
Drivers’ average income
$60,568

Delays build on Promenade Street: its congestion ratio of 20% over free-flow time is well above the county's 6%.

3US 136Primary road · 6,271vehicles630trucks · 10.1%
Road class
Primary road
Congestion ratio
14.7%
Median trip time
45.5 min
Drivers’ median age
50.0 yrs
Drivers’ average income
$63,332

US 136 peaks at 6,271 vehicles a day, 3.5 times the county average; trucks are 10.1% of it, above the county-wide 9.1%.

4Scott Wike Lucas BridgePrimary road · 6,228vehicles672trucks · 10.8%
Road class
Primary road
Median trip time
45.5 min
Drivers’ median age
50.3 yrs
Drivers’ average income
$63,074

Scott Wike Lucas Bridge carries 3.5 times the county average at its busiest, 672 of them trucks (10.8%, above the county-wide 9.1%).

5Laurel StreetPrimary road · 4,321vehicles342trucks · 7.9%
Road class
Primary road
Congestion ratio
9.8%
Median trip time
38.7 min
Drivers’ median age
52.0 yrs
Drivers’ average income
$67,039

Laurel Street carries 2.4 times the county average on its busiest stretch, where the median trip lasts 38.7 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Scott Wike Lucas BridgePrimary road · #4 by traffic6,228vehicles672trucks · 10.8%
2US 136Primary road · #3 by traffic6,271vehicles630trucks · 10.1%
3Dearborn StreetPrimary road · #1 by traffic7,043vehicles603trucks · 8.6%
4Promenade StreetPrimary road · #2 by traffic6,584vehicles588trucks · 8.9%
5Laurel StreetPrimary road · #5 by traffic4,321vehicles342trucks · 7.9%
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

MasonDepartment 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 Mason County

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

Need segment-level traffic data?

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