This page delivers traffic analytics for Johnson County, Iowa. Our metrics are calculated with multi-sourced, cross-verified data from real-world mobile and sensor networks, and averaged for Johnson County, Iowa among 591 road miles divided in 9,529 segments. Our metrics go beyond simple volume counts to provide actionable insights on traffic intensity, congestion, commercial vehicle flow, and network performance with highest possible granularity (average segment length is 328 ft). Whether you are evaluating a new retail location, planning logistics routes, or assessing infrastructure needs, this data helps you move from assumptions to certainty.
Data sourced from TrafficZoom's proprietary analytics platform.
The average number of vehicles that travel each day over any road in the road network.
4,808
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
11.6%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
30.1 min
Congestion ratio
Congestion ratio
The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.
15.6%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
39.1 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$93,457
Our data indicates an estimated average traffic volume of 4,808 vehicles per day in Johnson County, Iowa that results in 3,555,946 vehicle-miles traveled per day (≈1.3 billion per year). The traffic stream is comprised of an average of 1 truck for every 9 vehicles. Typical time spent behind the wheel per trip is 30.1 minutes, which already accounts for delays at signals, intersections, and congestion.
Analytical insight
When compared to the Iowa state averages: Johnson sees 58% higher average daily traffic volume than the state average (4,808 vehicles per day against 3,042), suggesting more demand on each road - a critical factor for logistics and site planning. Across the whole network that adds up to 3,555,946 vehicle-miles traveled per day (≈1.3 billion per year), roughly 4.3% of Iowa's statewide total. The average trip takes 30.1 minutes, 9% lower than the state level. Congestion runs 36% higher than the state level, at a ratio of 15.6% - more pronounced congestion - crucial for traffic control improvement and logistics planning. Johnson carries more traffic than 97% of counties in Iowa. Its average travel time of 30.1 minutes is longer than 6% of counties in Iowa.
Highway vs. Non-Highway Traffic Analysis
Highway Traffic
Traffic
Traffic
The average number of vehicles that travel each day over any road in the road network.
16,237
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
17.6%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
44.6 min
Congestion ratio
Congestion ratio
The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.
32.8%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
42.6 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$89,327
A significant volume of traffic in Johnson County, Iowa utilizes the highway network. The average highway carries 16,237 vehicles per day, 253% more than the average non-highway road in the same area, which carries 4,596 vehicles per day. That average covers 102 highway road miles divided in 173 segments (average segment length 3,112 ft), together carrying 1,774,877 vehicle-miles traveled per day (≈648 million per year). No more than 2 other counties in Iowa move more traffic on their highways. Trucks constitute 17.6% of highway traffic.
Analytical insight
The concentration of trucks on highways (17.6%) is 9% higher than the state average for similar road classifications. This indicates Johnson serves as a significant freight corridor. For logistics operators, this validates the importance of highway access. 71% of counties in Iowa see a lower highway truck share than Johnson's 17.6%. By raw truck volume, Johnson carries more highway trucks than 99% of counties in Iowa.
Non-highway traffic
Traffic
Traffic
The average number of vehicles that travel each day over any road in the road network.
4,596
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
5.6%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
29.8 min
Congestion ratio
Congestion ratio
The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.
15.3%
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
38.1 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$96,267
The non-highway road network in Johnson County, Iowa supports a substantial volume of traffic. The average non-highway road carries 4,596 vehicles per day, 72% less than the average highway in the same area, which carries 16,237 vehicles per day. That average covers 489 non-highway road miles divided in 9,356 segments (average segment length 276 ft), together carrying 1,781,069 vehicle-miles traveled per day (≈650 million per year). Trucks constitute 5.6% of non-highway traffic.
Analytical insight
Compared to highways, non-highway routes see 68% fewer trucks by share. At 37% higher than the state level, the non-highway congestion ratio of 15.3% signals more friction on local roads. 6% of counties in Iowa see shorter overall travel times than Johnson. Johnson's average driver income exceeds 97% of counties in Iowa. Johnson's median driver age is higher than 1% of counties in Iowa.
Time-of-Day & Seasonal Patterns
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–12:00 PM and PM peak 3:00 PM–7:00 PM, with volumes reaching approximately 70% higher than the daily average.
Weekend traffic:
Weekend volumes run about 20% below weekday levels.
Seasonal Fluctuation
Busy season:
April–June is the high season, with volumes +5% versus the annual average.
Lowest month:
January is the quietest month, with volumes -14% versus the annual average.
Analytical insight
In Johnson County, Iowa, the peak hour concentrates about 7% of the day's traffic, and seasonal swing is mild at +5% in high season.
Traffic Flow Profile Comparison
Metric
Johnson
Iowa
Average
Difference
Traffic
4,808
3,042
+58.1%
Truck % (Total Traffic)
11.6%
11.0%
+5.0%
Truck % (Highway)
17.6%
16.1%
+9.1%
Avg. Travel Time
30.1 min
33.0 min
-8.8%
Frequently Asked Questions
The average daily traffic volume is calculated at 4,808 vehicles per day, providing a baseline for daily operations and site assessment.
Trip origins in Johnson have higher average income than 97% of counties in Iowa.
Trucks account for approximately 11.6% of the total traffic mix across all road types, with a significantly higher concentration of 17.6% on highways.
Weekday peaks occur between 7:00 AM and 12:00 PM in the morning and between 3:00 PM and 7:00 PM in the evening - about 70% above the daily average.
Traffic volumes are typically 5% higher during April–June. Volumes drop to their lowest levels in January, averaging 4,145 vehicles per day - a 14% decrease from the annual average.
Drivers on Johnson roads have a median age of 39 years, and the median household income of the neighborhoods trips originate from averages $93,457 - useful context for retail siting and customer profiling.
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)
