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Traffic heat map of Decatur County, Indiana: 338 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 74 and Lincoln Street

Decatur County, Indiana Traffic Counts

TrafficZoom tracks traffic on 338 road miles in Decatur County, Indiana, divided into 3,869 segments averaging 461 ft. Its busiest road, I 74, carries 25,422 vehicles a day, 10.6 times the average road. 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 Decatur County, Indiana

Traffic

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

vehicles per day2,400
Trucks

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

16.6%
Average travel time

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

38.1 min
Congestion ratio

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

10.4%
Drivers’ average age

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

48.3 yrs
Drivers’ average income

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

$78,092

Our data shows 2,400 vehicles per day on the average road in Decatur County, Indiana, and 1,118,907 vehicle-miles traveled per day (≈408 million per year) across its 338 miles of monitored roads. At 16.6%, the truck share runs above the 12.1% across Indiana: about 1 in 6 vehicles.

Longer trips than 93% of counties in Indiana

Decatur's average daily traffic volume is 58% lower than the state average - 2,400 vehicles per day against 5,704 - 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 about 0.7% of Indiana's statewide total of vehicle-miles. By volume, Decatur's 2,400 vehicles per day trails 85% of counties in Indiana.

The average trip takes 38.1 minutes, 14% higher than the state level. 93% of counties in Indiana have a shorter average travel time than Decatur's 38.1 minutes.

Congestion runs 33% lower than the state level, at a ratio of 10.4%, which means smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Decatur County, Indiana

Trafficvehicles per day11,438
Trucks25.2%
Average travel time68.2 min
Congestion ratio24.0%
Drivers’ average age47.7 yrs
Drivers’ average income$80,469

Travel in Decatur County, Indiana splits roughly evenly, with about half of it (52% of vehicle-miles) on highways. The average highway carries 11,438 vehicles per day, 405% more than the average non-highway road in the same area, which carries 2,263 vehicles per day.

That comes from just 14% of the monitored road miles: 46 miles in 58 segments, carrying 576,600 vehicle-miles traveled per day (≈210 million per year).

50% of counties in Indiana move less traffic on their highways.

Higher highway truck share than 73% of counties in Indiana

At 25.2%, highway truck share is 29% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

73% of counties in Indiana see a lower highway truck share than Decatur's 25.2%. By raw truck volume, Decatur carries more highway trucks than 64% of counties in Indiana.

non-highway traffic icon

Non-highway Traffic in Decatur County, Indiana

Trafficvehicles per day2,263
Trucks7.6%
Average travel time37.7 min
Congestion ratio10.2%
Drivers’ average age48.5 yrs
Drivers’ average income$77,434

Travel in Decatur County, Indiana splits roughly evenly, with about half of it (48% of vehicle-miles) on local roads. A typical local road sees 2,263 vehicles per day.

Spread over 292 miles and 3,811 segments, 86% of the road network, local roads carry a lighter load per mile: 542,307 vehicle-miles traveled per day (≈198 million per year). About 1 in 13 vehicles on non-highway roads is a truck (7.6%).

Drivers from higher-income areas than 71% of counties in Indiana

The concentration of trucks on non-highway roads is 70% lower than on highways.

Non-highway congestion (10.2%) runs 33% lower than the state average, pointing to smoother local traffic flow.

Trip origins here have higher average income than 71% of counties in Indiana. The driver population here skews older than 54% of counties in Indiana.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Decatur County vs. Indiana Traffic Comparison

Of the four measures, average daily traffic per road differs most: Decatur County runs 58% below the Indiana average. Its truck share, by contrast, is 38% above.

MetricDecatur CountyIndiana averageDifference
Traffic2,4005,704-57.9%
Truck % (Total Traffic)16.6%12.1%+37.6%
Truck % (Highway)25.2%19.6%+28.7%
Avg. Travel Time38.1 min33.5 min+13.7%

How Decatur County compares

Decatur County has the quietest roads among its nearby counties

Against the 4 nearest areas, Decatur County carries 36.8% less traffic on a typical road; it has the quietest roads of the five.

Decatur County and the 4 nearest county-level areas by centroid distance, with the Indiana average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Decatur County2,40016.6%1,118,90738.1 min10.4%
Ripley County, Indiana3,69914.2%800,14434.3 min10.4%
Rush County, Indiana2,78910.4%376,24239.4 min10.1%
Bartholomew County, Indiana5,17212.5%2,494,10334.3 min14.1%
Shelby County, Indiana3,53118.7%1,573,51334.1 min10.8%
Indiana average5,70412.1%N/A33.5 min15.6%

Decatur County ranked within Indiana

Decatur County sits in the top quarter of the Indiana field on average travel time, at #7 of 92.

Decatur County ranked among 92 county-level areas in Indiana (1 = highest); measures without data in every county rank a smaller field, down to 79.
MeasureDecatur CountyIndiana rank
Traffic volume (AADT)2,400#78 of 92
Highway vehicle-miles per day576,600#40 of 79
Truck share on highways25.2%#22 of 79
Highway trucks per day2,882#29 of 79
Average travel time38.1 min#7 of 92
Average driver income$78,092#27 of 92
Average driver age48.3 yrs#43 of 92

The two ends of this table sit far apart: #7 of 92 on average travel time, against #78 of 92 on average daily traffic volume.

Busiest roads in Decatur County, Indiana

Traffic concentrates on a few corridors: the three busiest roads average 16,030 vehicles a day, against 2,400 on the average road in Decatur County.

I 74 is the busiest road, at 25,422 vehicles a day, 6,866 of them trucks (27.0%). No other road comes close: Lincoln Street, in second place, carries 12,079. It also carries the most trucks.

I 74 carries longer journeys than most roads here, with a median trip of 67.2 minutes against 38.1 county-wide.

Few trucks use Lincoln Street: 3.3% of its traffic, under half the county's 16.6%.

Freight stands out on I 74: trucks are 27.0% of the traffic there, against 16.6% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 74Motorway · 25,422vehicles6,866trucks · 27.0%
Road class
Motorway
Congestion ratio
26.1%
Median trip time
67.2 min
Drivers’ median age
47.5 yrs
Drivers’ average income
$79,761

Travel on I 74's busiest stretch runs 26% over free-flow time, against 10% across the county, so expect slower peak hours.

2Lincoln StreetTertiary road · 12,079vehicles404trucks · 3.3%
Road class
Tertiary road
Congestion ratio
26.3%
Median trip time
34.1 min
Drivers’ median age
48.6 yrs
Drivers’ average income
$73,840

Lincoln Street is one of the more congested roads here: trips take 26% longer than at free-flow speed, against 10% county-wide.

3Main StreetPrimary road · 10,589vehicles923trucks · 8.7%
Road class
Primary road
Congestion ratio
10.8%
Median trip time
43.2 min
Drivers’ median age
47.5 yrs
Drivers’ average income
$75,574

The busiest stretch of Main Street carries 4.4 times the county average; trucks are 8.7% of it, below the county-wide 16.6%.

4US 421Primary road · 8,792vehicles996trucks · 11.3%
Road class
Primary road
Congestion ratio
13.2%
Median trip time
40.8 min
Drivers’ median age
48.8 yrs
Drivers’ average income
$76,266

On its busiest stretch, US 421 carries 3.7 times the county average; trucks are 11.3% of it, below the county-wide 16.6%.

5SR 3Primary road · 8,742vehicles736trucks · 8.4%
Road class
Primary road
Congestion ratio
14.8%
Median trip time
41.2 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$73,015

SR 3 peaks at 8,742 vehicles a day, 3.6 times the county average; trucks are 8.4% of it, below the county-wide 16.6%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 74Motorway · #1 by traffic25,422vehicles6,866trucks · 27.0%
2US 421Primary road · #4 by traffic8,792vehicles996trucks · 11.3%
3Main StreetPrimary road · #3 by traffic10,589vehicles923trucks · 8.7%
4Michigan AveSecondary road · 7,513vehicles738trucks · 9.8%
Road class
Secondary road
Median trip time
34.6 min
Drivers’ median age
48.0 yrs
Drivers’ average income
$80,851

Michigan Ave carries 3.1 times the county average at its busiest, 738 of them trucks (9.8%, below the county-wide 16.6%).

5SR 3Primary road · #5 by traffic8,742vehicles736trucks · 8.4%
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

DecaturDepartment 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 Decatur County

The same traffic breakdown for the areas closest to Decatur County, Indiana.

Need segment-level traffic data?

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