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Traffic heat map of Lyman County, South Dakota: 277 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Purple Heart Memorial Highway

Lyman County, South Dakota Traffic Counts

How busy are the roads of Lyman County, South Dakota? We measure 277 road miles, divided into 702 segments, with multi-sourced, cross-verified mobile and sensor data. Its highways carry one of the top 5 truck shares of any county in South Dakota. The breakdown below covers volume, trucks, congestion and driver profiles for retailers, logistics planners and engineers.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
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total traffic icon

Total Traffic Volume & Performance in Lyman County, South Dakota

Traffic

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

vehicles per day1,362
Trucks

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

18.2%
Average travel time

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

37.0 min
Drivers’ average age

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

49.7 yrs
Drivers’ average income

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

$66,561

The average monitored road in Lyman County, South Dakota carries 1,362 vehicles per day. Across its 277 miles of monitored roads, that adds up to 571,253 vehicle-miles traveled per day (≈209 million per year). Freight weighs heavily here: trucks are 18.2% of traffic, against 10.3% across South Dakota.

Traffic 57% below the South Dakota average

At 1,362 vehicles per day, the average monitored road in Lyman carries 57% less traffic than the state average of 3,156, suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Lyman accounts for about 2.3% of South Dakota's statewide total of vehicle-miles. 62% of counties in South Dakota see less traffic than Lyman's 1,362 vehicles per day.

The average trip takes 37.0 minutes, 14% higher than the state level. 51% of counties in South Dakota have a longer average travel time than Lyman's 37.0 minutes.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Lyman County, South Dakota

Trafficvehicles per day3,182
Trucks19.2%
Average travel time60.6 min
Drivers’ average age49.4 yrs
Drivers’ average income$68,186

The vast majority of driving in Lyman County, South Dakota happens on highways: 90% of all vehicle-miles. The average highway carries 3,182 vehicles per day, 333% more than the average non-highway road in the same area, which carries 735 vehicles per day.

Highways make up 57% of the monitored road miles (159 miles, 180 segments), so they carry more than their share: 512,391 vehicle-miles traveled per day (≈187 million per year).

That is more highway travel volume than 90% of counties in South Dakota.

Higher highway truck share than 92% of counties in South Dakota

Highway truck concentration here runs 41% higher than the state average, at 19.2%. Highways here lean toward freight, so highway access is a real asset for logistics operators.

Lyman's highway truck share (19.2%) is higher than 92% of counties in South Dakota. 73% of counties in South Dakota see fewer highway trucks per day than Lyman's roughly 611.

non-highway traffic icon

Non-highway Traffic in Lyman County, South Dakota

Trafficvehicles per day735
Trucks9.5%
Average travel time28.9 min
Drivers’ average age52.1 yrs
Drivers’ average income$60,620

Local roads carry only a small share of the traffic in Lyman County, South Dakota, 10% of all vehicle-miles. A typical local road sees 735 vehicles per day.

Local roads make up 43% of the monitored road miles (118 miles in 522 segments) but carry less than their share of travel: 58,862 vehicle-miles traveled per day (≈21.5 million per year). About 1 in 10 vehicles on non-highway roads is a truck (9.5%).

Drivers from lower-income areas than 66% of counties in South Dakota

The concentration of trucks on non-highway roads is 50% lower than on highways.

Trip origins here have lower average income than 66% of counties in South Dakota. Lyman's median driver age is higher than 54% of counties in South Dakota.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 77% higher than the daily average.
Weekend traffic:
Weekends are busier than weekdays: volumes run about 14% above weekday levels, which usually points to leisure, tourism or shopping traffic.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +48% versus the annual average.
Lowest month:
January is the quietest month, with volumes -40% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Lyman County, South Dakota, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +48% in high season.

Lyman County vs. South Dakota Traffic Comparison

Lyman County's biggest difference from the South Dakota average is its truck share, 77% above it. Its average daily traffic per road, by contrast, is 57% below.

MetricLyman CountySouth Dakota averageDifference
Traffic1,3623,156-56.8%
Truck % (Total Traffic)18.2%10.3%+77.0%
Truck % (Highway)19.2%13.6%+41.3%
Avg. Travel Time37.0 min32.5 min+14.0%

How Lyman County compares

Lyman County moves more traffic than any nearby county

Compared with its 4 closest neighbours, Lyman County carries 35.0% less traffic on a typical road and moves 2.3 times the total daily travel; it has the fourth busiest roads of the five. It is bigger rather than busier: the extra travel comes from carrying more road, not from heavier roads.

Lyman County and the 4 nearest county-level areas by centroid distance, with the South Dakota average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Lyman County1,36218.2%571,25337.0 minN/A
Hughes County, South Dakota5,1037.7%301,16231.3 minN/A
Buffalo County, South Dakota30213.3%22,79042.0 minN/A
Brule County, South Dakota1,50413.4%373,40729.4 minN/A
Jones County, South Dakota1,47222.2%309,39459.6 minN/A
South Dakota average3,15610.3%N/A32.5 min12.9%

Lyman County ranked within South Dakota

Truck share on highways places Lyman County #5 of 49 in South Dakota - the top quarter of the state.

Lyman County ranked among 66 county-level areas in South Dakota (1 = highest); measures without data in every county rank a smaller field, down to 49.
MeasureLyman CountySouth Dakota rank
Traffic volume (AADT)1,362#26 of 66
Highway vehicle-miles per day512,391#6 of 49
Truck share on highways19.2%#5 of 49
Highway trucks per day611#14 of 49
Average travel time37.0 min#34 of 66
Average driver income$66,561#44 of 66
Average driver age49.7 yrs#31 of 66

Busiest roads in Lyman County, South Dakota

The three busiest roads in Lyman County average 5,983 vehicles a day, 4.4 times the county average of 1,362 across all its monitored roads.

Purple Heart Memorial Highway is the busiest road, at 7,515 vehicles a day, 1,500 of them trucks (20.0%). Purple Heart Memorial Highway/Blue Star Memorial Highway/Vietnam Veterans Memorial Highway is practically level with it at 7,442. Purple Heart Memorial Highway/Blue Star Memorial Highway/Vietnam Veterans Memorial Highway carries the most trucks, 1,722 a day (23.1% of its traffic), although it ranks #2 for all traffic.

Trips using Purple Heart Memorial Highway/Blue Star Memorial Highway/Vietnam Veterans Memorial Highway are long: a median of 67.3 minutes against 37.0 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Purple Heart Memorial HighwayMotorway · 7,515vehicles1,500trucks · 20.0%
Road class
Motorway
Median trip time
59.3 min
Drivers’ median age
49.6 yrs
Drivers’ average income
$66,935

Purple Heart Memorial Highway carries through traffic: the median trip using it lasts 59.3 minutes, against 37.0 for the county.

2Purple Heart Memorial Highway/Blue Star Memorial Highway/Vietnam Veterans Memorial HighwayMotorway · 7,442vehicles1,722trucks · 23.1%
Road class
Motorway
Median trip time
67.3 min
Drivers’ median age
47.4 yrs
Drivers’ average income
$64,686

Purple Heart Memorial Highway/Blue Star Memorial Highway/Vietnam Veterans Memorial Highway is a trunk route for the county, carrying 5.5 times the county average on its busiest stretch; trucks are 23.1% of it, above the county-wide 18.2%.

3US 83Trunk road · 2,992vehicles381trucks · 12.7%
Road class
Trunk road
Median trip time
54.8 min
Drivers’ median age
47.4 yrs
Drivers’ average income
$72,956

Drivers on US 83 are on long journeys, a median 54.8 minutes against 37.0 county-wide: a through route more than a local street.

4Highway 16Primary road · 2,938vehicles164trucks · 5.6%
Road class
Primary road
Median trip time
23.4 min
Drivers’ median age
52.0 yrs
Drivers’ average income
$66,493

At 2.2 times the county average, Highway 16 draws drivers from neighborhoods averaging $66,493 in household income.

5SD 16Primary road · 1,241vehicles122trucks · 9.8%
Road class
Primary road
Median trip time
36.6 min
Drivers’ median age
55.5 yrs
Drivers’ average income
$63,520

SD 16 is a quieter road: its busiest stretch carries 9% less than the county average; trucks are 9.8% of it, below the county-wide 18.2%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Purple Heart Memorial Highway/Blue Star Memorial Highway/Vietnam Veterans Memorial HighwayMotorway · #2 by traffic7,442vehicles1,722trucks · 23.1%
2Purple Heart Memorial HighwayMotorway · #1 by traffic7,515vehicles1,500trucks · 20.0%
3US 83Trunk road · #3 by traffic2,992vehicles381trucks · 12.7%
4Highway 16Primary road · #4 by traffic2,938vehicles164trucks · 5.6%
5SD 16Primary road · #5 by traffic1,241vehicles122trucks · 9.8%
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

LymanDepartment 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 Lyman County

The same traffic breakdown for the areas closest to Lyman County, South Dakota.

Need segment-level traffic data?

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