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Traffic heat map of Brookings County, South Dakota: 365 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Medary Avenue and 22nd Avenue

Brookings County, South Dakota Traffic Counts

How busy are the roads of Brookings County, South Dakota? We measure 365 road miles, divided into 3,949 segments, with multi-sourced, cross-verified mobile and sensor data. Its drivers are the youngest of any county in South Dakota, a median 37 years. 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 Volume & Performance in Brookings County, South Dakota

Traffic

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

vehicles per day3,222
Trucks

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

9.1%
Average travel time

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

33.5 min
Drivers’ average age

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

36.7 yrs
Drivers’ average income

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

$73,208

Our data shows 3,222 vehicles per day on the average road in Brookings County, South Dakota, and 835,611 vehicle-miles traveled per day (≈305 million per year) across its 365 miles of monitored roads. About 1 in 11 vehicles is a truck, in line with South Dakota (10.3%).

Busier roads than 89% of counties in South Dakota

The average road in Brookings carries 3,222 vehicles per day, essentially matching the state average of 3,156. Network-wide, Brookings accounts for about 3.4% of South Dakota's statewide total of vehicle-miles. By volume, Brookings's 3,222 vehicles per day outpaces 89% of counties in South Dakota.

The average trip takes 33.5 minutes, on par with the state level. Its average travel time of 33.5 minutes is shorter than 72% of counties in South Dakota.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Brookings County, South Dakota

Trafficvehicles per day4,369
Trucks12.3%
Average travel time40.9 min
Drivers’ average age39.2 yrs
Drivers’ average income$73,688

Travel in Brookings County, South Dakota splits roughly evenly, with about half of it (53% of vehicle-miles) on highways. The average highway carries 4,369 vehicles per day, 42% more than the average non-highway road in the same area, which carries 3,074 vehicles per day.

With 26% of the road miles (95 miles in 451 segments), highways punch above their length, carrying 439,587 vehicle-miles traveled per day (≈160 million per year).

83% of counties in South Dakota move less traffic on their highways.

Lower highway truck share than 75% of counties in South Dakota

The concentration of trucks on highways (12.3%) is 9% lower than the state average for similar road classifications. The highway traffic mix is typical for South Dakota: neither freight- nor commuter-dominated.

Brookings's highway truck share (12.3%) is lower than 75% of counties in South Dakota. By raw truck volume, Brookings carries more highway trucks than 67% of counties in South Dakota.

non-highway traffic icon

Non-highway Traffic in Brookings County, South Dakota

Trafficvehicles per day3,074
Trucks5.6%
Average travel time32.5 min
Drivers’ average age36.1 yrs
Drivers’ average income$72,955

Travel in Brookings County, South Dakota splits roughly evenly, with about half of it (47% of vehicle-miles) on local roads. On the average non-highway road, that comes to 3,074 vehicles per day.

Spread over 270 miles and 3,498 segments, 74% of the road network, local roads carry a lighter load per mile: 396,024 vehicle-miles traveled per day (≈145 million per year). About 1 in 18 vehicles on non-highway roads is a truck (5.6%).

The youngest drivers of any county in South Dakota

Non-highway roads carry a truck concentration that's 55% lower than the highway network.

58% of counties in South Dakota see lower average driver income among trip origins than Brookings. At 37 years, Brookings's median driver age is the lowest in South Dakota.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Brookings County vs. South Dakota Traffic Comparison

Brookings County stays close to the South Dakota average; the largest gap is its truck share, 11% below.

MetricBrookings CountySouth Dakota averageDifference
Traffic3,2223,156+2.1%
Truck % (Total Traffic)9.1%10.3%-11.1%
Truck % (Highway)12.3%13.6%-9.1%
Avg. Travel Time33.5 min32.5 min+3.0%

How Brookings County compares

Brookings County has the busiest roads among its nearby counties

Against the 4 nearest areas, Brookings County carries 235.6% more traffic on a typical road and moves 3.2 times the total daily travel; it has the busiest roads of the five. Bigger and busier at once: more road than the areas around it and heavier traffic on it, which makes it the centre of gravity for travel in this part of the map.

Brookings 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
Brookings County3,2229.1%835,61133.5 minN/A
Deuel County, South Dakota1,15212.6%266,51941.0 minN/A
Hamlin County, South Dakota1,01710.2%198,30634.6 minN/A
Lincoln County, Minnesota7009.6%166,68738.6 min3.3%
Moody County, South Dakota97212.5%405,36637.6 minN/A
South Dakota average3,15610.3%N/A32.5 min12.9%

Brookings County ranked within South Dakota

Brookings County records the lowest average driver age in South Dakota.

Brookings 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.
MeasureBrookings CountySouth Dakota rank
Traffic volume (AADT)3,222#8 of 66
Highway vehicle-miles per day439,587#9 of 49
Truck share on highways12.3%#37 of 49
Highway trucks per day539#17 of 49
Average travel time33.5 min#48 of 66
Average driver income$73,208#28 of 66
Average driver age36.7 yrs#66 of 66

Brookings County ranks #8 of 66 on average daily traffic volume but #66 of 66 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Brookings County, South Dakota

Traffic concentrates on a few corridors: the three busiest roads average 13,735 vehicles a day, against 3,222 on the average road in Brookings County.

Medary Avenue leads with 14,627 vehicles a day, 672 of them trucks (4.6%). I 29 carries the most trucks, 1,445 a day (13.5% of its traffic), although it ranks #4 for all traffic.

Trips using I 29 are long: a median of 52.7 minutes against 33.5 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Medary AvenueSecondary road · 14,627vehicles672trucks · 4.6%
Road class
Secondary road
Median trip time
34.2 min
Drivers’ median age
35.7 yrs
Drivers’ average income
$62,505

Medary Avenue peaks at 14,627 vehicles a day, 4.5 times the county average; trucks are 4.6% of it, below the county-wide 9.1%.

222nd AvenueSecondary road · 13,812vehicles747trucks · 5.4%
Road class
Secondary road
Median trip time
28.8 min
Drivers’ median age
37.5 yrs
Drivers’ average income
$69,419

22nd Avenue carries 4.3 times the county average at its busiest, 747 of them trucks (5.4%, below the county-wide 9.1%).

36th StreetPrimary road · 12,765vehicles708trucks · 5.5%
Road class
Primary road
Median trip time
31.1 min
Drivers’ median age
37.5 yrs
Drivers’ average income
$65,450

6th Street carries 4.0 times the county average on its busiest stretch, where the median trip lasts 31.1 minutes.

4I 29Motorway · 10,713vehicles1,445trucks · 13.5%
Road class
Motorway
Median trip time
52.7 min
Drivers’ median age
41.5 yrs
Drivers’ average income
$74,227

At 3.3 times the county average, I 29 draws drivers from neighborhoods averaging $74,227 in household income.

5Highway 14Trunk road · 9,328vehicles714trucks · 7.7%
Road class
Trunk road
Median trip time
32.1 min
Drivers’ median age
38.1 yrs
Drivers’ average income
$73,195

The busiest stretch of Highway 14 carries 2.9 times the county average; trucks are 7.7% of it, below the county-wide 9.1%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 29Motorway · #4 by traffic10,713vehicles1,445trucks · 13.5%
222nd AvenueSecondary road · #2 by traffic13,812vehicles747trucks · 5.4%
3Highway 14Trunk road · #5 by traffic9,328vehicles714trucks · 7.7%
46th StreetPrimary road · #3 by traffic12,765vehicles708trucks · 5.5%
5Medary AvenueSecondary road · #1 by traffic14,627vehicles672trucks · 4.6%
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

BrookingsDepartment 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 Brookings County

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

Need segment-level traffic data?

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