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Traffic heat map of Gregory County, South Dakota: 153 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 18 and Park Avenue

Gregory County, South Dakota Traffic Counts

TrafficZoom tracks traffic on 153 road miles in Gregory County, South Dakota, divided into 748 segments averaging 1,082 ft. The average road here carries 782 vehicles a day, 75% less than the South Dakota average of 3,156. 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 Gregory County, South Dakota

Traffic

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

vehicles per day782
Trucks

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

10.2%
Average travel time

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

31.9 min
Drivers’ average age

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

53.7 yrs
Drivers’ average income

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

$56,209

Our data shows 782 vehicles per day on the average road in Gregory County, South Dakota, and 117,284 vehicle-miles traveled per day (≈42.8 million per year) across its 153 miles of monitored roads. Trucks are 10.2% of traffic, close to the 10.3% across South Dakota.

Traffic 75% below the South Dakota average

Gregory's average daily traffic volume is 75% lower than the state average - 782 vehicles per day against 3,156 - suggesting less traffic load per road - quiet roads that suit freight movement more than drive-by retail. Across the whole network, that travel is about 0.5% of South Dakota's statewide total. 74% of counties in South Dakota see more traffic than Gregory's 782 vehicles per day.

Journey times here (31.9 minutes on average) closely track the state level. On travel time, Gregory runs shorter than 74% of counties in South Dakota.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Gregory County, South Dakota, the peak hour concentrates about 7% of the day's traffic.

Gregory County vs. South Dakota Traffic Comparison

Gregory County's biggest difference from the South Dakota average is its average daily traffic per road, 75% below it. The other measures stay close to the average.

MetricGregory CountySouth Dakota averageDifference
Traffic7823,156-75.2%
Truck % (Total Traffic)10.2%10.3%-0.4%
Avg. Travel Time31.9 min32.5 min-1.8%

How Gregory County compares

Gregory County against nearby counties

Compared with its 4 closest neighbours, Gregory County carries 33.4% less traffic on a typical road; it has the fourth busiest roads of the five.

Gregory 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
Gregory County78210.2%117,28431.9 minN/A
Tripp County, South Dakota1,90910.2%129,80634.7 minN/A
Keya Paha County, Nebraska16515.9%5,17542.3 minN/A
Brule County, South Dakota1,50413.4%373,40729.4 minN/A
Charles Mix County, South Dakota1,1189.6%149,36234.0 minN/A
South Dakota average3,15610.3%N/A32.5 min12.9%

Gregory County ranked within South Dakota

Average driver income places Gregory County #60 of 66 in South Dakota - the bottom quarter of the state.

Gregory County ranked among 66 county-level areas in South Dakota (1 = highest).
MeasureGregory CountySouth Dakota rank
Traffic volume (AADT)782#49 of 66
Average travel time31.9 min#49 of 66
Average driver income$56,209#60 of 66
Average driver age53.7 yrs#13 of 66

Gregory County ranks #13 of 66 on average driver age but #60 of 66 on average driver income - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Gregory County, South Dakota

Traffic concentrates on a few corridors: the three busiest roads average 1,309 vehicles a day, against 782 on the average road in Gregory County.

US 18 is the busiest road, at 1,966 vehicles a day, 177 of them trucks (9.0%). That is 56% more than the next road, Park Avenue (1,263). It tops the truck ranking too, with the most trucks.

US 281 carries longer journeys than most roads here, with a median trip of 51.1 minutes against 31.9 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 18Primary road · 1,966vehicles177trucks · 9.0%
Road class
Primary road
Median trip time
26.7 min
Drivers’ median age
54.0 yrs
Drivers’ average income
$54,233

The busiest stretch of US 18 carries 2.5 times the county average; trucks are 9.0% of it, below the county-wide 10.2%.

2Park AvenueSecondary road · 1,263vehicles89trucks · 7.0%
Road class
Secondary road
Median trip time
21.4 min
Drivers’ median age
54.9 yrs
Drivers’ average income
$53,443

Park Avenue is a local road at heart: the median trip using it lasts 21.4 minutes, against 31.9 for the county.

3SD 44Primary road · 697vehicles74trucks · 10.6%
Road class
Primary road
Median trip time
46.0 min
Drivers’ median age
52.7 yrs
Drivers’ average income
$54,685

Drivers on SD 44 are on long journeys, a median 46.0 minutes against 31.9 county-wide: a through route more than a local street.

4US 281Primary road · 611vehicles56trucks · 9.2%
Road class
Primary road
Median trip time
51.1 min
Drivers’ median age
53.1 yrs
Drivers’ average income
$58,705

US 281 is a quieter road: its busiest stretch carries 22% less than the county average; trucks are 9.2% of it, below the county-wide 10.2%.

5SD 47Secondary road · 503vehicles40trucks · 7.9%
Road class
Secondary road
Median trip time
23.0 min
Drivers’ median age
54.5 yrs
Drivers’ average income
$53,967

Even at its busiest, SD 47 carries 36% less than the county average; trucks are 7.9% of it, below the county-wide 10.2%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 18Primary road · #1 by traffic1,966vehicles177trucks · 9.0%
2Park AvenueSecondary road · #2 by traffic1,263vehicles89trucks · 7.0%
3SD 44Primary road · #3 by traffic697vehicles74trucks · 10.6%
4US 281Primary road · #4 by traffic611vehicles56trucks · 9.2%
5Dakota Highway 44Primary road · 426vehicles55trucks · 12.9%
Road class
Primary road
Median trip time
36.0 min
Drivers’ median age
51.9 yrs
Drivers’ average income
$53,564

Dakota Highway 44 is a quieter road: its busiest stretch carries 46% less than the county average; trucks are 12.9% of it, above the county-wide 10.2%.

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

GregoryDepartment 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 Gregory County

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

Need segment-level traffic data?

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