This page delivers traffic analytics for Union County, South Dakota. Our metrics are calculated with multi-sourced, cross-verified data from real-world mobile and sensor networks, and averaged for Union County, South Dakota among 252 road miles divided in 1,547 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 862 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.
1,628
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
16.2%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
25.9 min
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
44.6 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$81,288
Our data indicates an estimated average traffic volume of 1,628 vehicles per day in Union County, South Dakota that results in 841,436 vehicle-miles traveled per day (≈307 million per year). The traffic stream is comprised of an average of 1 truck for every 6 vehicles. Typical time spent behind the wheel per trip is 25.9 minutes, which already accounts for delays at signals, intersections, and congestion.
Analytical insight
When compared to the South Dakota state averages: Union's average daily traffic volume is 48% lower than the state average - 1,628 vehicles per day against 3,156 - suggesting less traffic load per road, a critical factor for logistics and site planning. Network-wide, Union accounts for about 3.4% of South Dakota's statewide total, at 841,436 vehicle-miles traveled per day (≈307 million per year). The average trip takes 25.9 minutes, 20% lower than the state level. Union carries more traffic than 71% of counties in South Dakota. Union additionally records the lowest average travel time of any county in South Dakota - 25.9 minutes.
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.
6,051
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
17.8%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
45.7 min
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
43.8 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$80,746
A significant volume of traffic in Union County, South Dakota utilizes the highway network. The average highway carries 6,051 vehicles per day, 368% more than the average non-highway road in the same area, which carries 1,293 vehicles per day. That average covers 98 highway road miles divided in 109 segments (average segment length 4,743 ft), together carrying 710,720 vehicle-miles traveled per day (≈259 million per year). No more than 2 other counties in South Dakota move more traffic on their highways. Trucks constitute 17.8% of highway traffic.
Analytical insight
At 17.8%, highway truck share is 31% higher than the state average, marking Union as a significant freight corridor - underscoring the importance of highway access for logistics operators. Union's highway truck share (17.8%) is higher than 88% of counties in South Dakota. 98% of counties in South Dakota see fewer highway trucks per day than Union's roughly 1,077.
Non-highway traffic
Traffic
Traffic
The average number of vehicles that travel each day over any road in the road network.
1,293
Trucks
Trucks
The percentage of the total traffic volume composed of heavy vehicles.
7.4%
Average travel time
Average travel time
The average time of travel averaged among all vehicles traveling on the road network.
24.4 min
Drivers’ average age
Drivers’ average age
Average age of residents in the geographic areas where the vehicle trips originated.
46.6 yrs
Drivers’ average income
Drivers’ average income
Average income of residents in the geographic areas where the vehicle trips originated.
$82,963
The non-highway road network in Union County, South Dakota supports a substantial volume of traffic. The average non-highway road carries 1,293 vehicles per day, 79% less than the average highway in the same area, which carries 6,051 vehicles per day. That average covers 155 non-highway road miles divided in 1,438 segments (average segment length 567 ft), together carrying 130,716 vehicle-miles traveled per day (≈47.7 million per year). Trucks constitute 7.4% of non-highway traffic.
Analytical insight
Compared to highways, non-highway routes see 59% fewer trucks by share. Overall, Union has the lowest average travel time in South Dakota, at 25.9 minutes. Union's average driver income exceeds 89% of counties in South Dakota. Union's median driver age is higher than 17% of counties in South Dakota.
Time-of-Day & Seasonal Patterns
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–9:00 AM and PM peak 3:00 PM–7:00 PM, with volumes reaching approximately 72% higher than the daily average.
Weekend traffic:
Weekend volumes run about 3% below weekday levels.
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +17% versus the annual average.
Lowest month:
January is the quietest month, with volumes -24% versus the annual average.
Analytical insight
In Union County, South Dakota, the peak hour concentrates about 7% of the day's traffic, and seasonal swing is pronounced at +17% in high season.
Traffic Flow Profile Comparison
Metric
Union
South Dakota
Average
Difference
Traffic
1,628
3,156
-48.4%
Truck % (Total Traffic)
16.2%
10.3%
+57.4%
Truck % (Highway)
17.8%
13.6%
+31.1%
Avg. Travel Time
25.9 min
32.5 min
-20.4%
Frequently Asked Questions
The average daily traffic volume is calculated at 1,628 vehicles per day, providing a baseline for daily operations and site assessment.
Yes - at 25.9 minutes, Union has the lowest average travel time of any county in South Dakota.
Approximately 41% of highway traffic and 10% of non-highway traffic consists of vehicles whose trip originates outside Union County, South Dakota. This indicates that a portion of highway traffic is regional pass-through, while local roads are more representative of resident and commuter activity.
Weekday peaks occur between 7:00 AM and 9:00 AM in the morning and between 3:00 PM and 7:00 PM in the evening - about 72% above the daily average.
Trucks account for approximately 16.2% of the total traffic mix across all road types, with a significantly higher concentration of 17.8% on highways.
Drivers on Union roads have a median age of 45 years, and the median household income of the neighborhoods trips originate from averages $81,288 - useful context for retail siting and customer profiling.
Traffic volumes are typically 17% higher during June–August. Volumes drop to their lowest levels in January, averaging 1,244 vehicles per day - a 24% decrease from the annual average.
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)
