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Traffic heat map of Slope County, North Dakota: 61 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Theodore Roosevelt Expressway

Slope County, North Dakota Traffic Counts

Trips here are among the 3 longest of any county in North Dakota. This page breaks down traffic in Slope County, North Dakota across 61 miles of monitored roads split into 202 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
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 Slope County, North Dakota

Traffic

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

vehicles per day764
Trucks

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

13.4%
Average travel time

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

58.9 min
Congestion ratio

The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.

2.8%
Drivers’ average age

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

45.8 yrs
Drivers’ average income

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

$77,561

Our data shows 764 vehicles per day on the average road in Slope County, North Dakota, and 55,462 vehicle-miles traveled per day (≈20.2 million per year) across its 61 miles of monitored roads. Trucks are 13.4% of traffic, more than the 11.1% across North Dakota.

Longer trips than 98% of counties in North Dakota

Slope sees 65% lower average daily traffic volume than the state average (764 vehicles per day against 2,174), suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. In total volume terms, its road network carries about 0.3% of North Dakota's statewide total of vehicle-miles. Slope carries less traffic than 60% of counties in North Dakota.

The average trip takes 58.9 minutes, 59% higher than the state level. Its average travel time of 58.9 minutes is longer than 98% of counties in North Dakota.

At 74% lower than the state level, the 2.8% congestion ratio signals smoother traffic flow - delays are rare enough to plan travel times almost to the minute.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Slope County, North Dakota

Trafficvehicles per day1,275
Trucks14.0%
Average travel time60.9 min
Congestion ratio2.8%
Drivers’ average age44.4 yrs
Drivers’ average income$78,135

Most travel in Slope County, North Dakota happens on highways, 79% of all vehicle-miles. The average highway carries 1,275 vehicles per day, 180% more than the average non-highway road in the same area, which carries 456 vehicles per day.

With 52% of the road miles (32 miles in 76 segments), highways punch above their length, carrying 44,010 vehicle-miles traveled per day (≈16.1 million per year).

Fewer highway trucks than 68% of counties in North Dakota

Highway truck concentration here (14.0%) closely tracks the state average for similar road classifications. The highway traffic mix is typical for North Dakota: neither freight- nor commuter-dominated.

By truck concentration, highways here trail 65% of counties in North Dakota. Slope's highway truck count is lower than 68% of counties in North Dakota, at roughly 179 trucks per day.

non-highway traffic icon

Non-highway Traffic in Slope County, North Dakota

Trafficvehicles per day456
Trucks10.8%
Average travel time57.7 min
Drivers’ average age59.7 yrs
Drivers’ average income$72,010

At 21% of vehicle-miles, local roads carry a smaller share of the traffic in Slope County, North Dakota than highways. A typical local road sees 456 vehicles per day.

Local roads make up 48% of the monitored road miles (29 miles in 126 segments) but carry less than their share of travel: 11,452 vehicle-miles traveled per day (≈4.2 million per year). The truck share on non-highway roads is 10.8%.

Younger drivers than 67% of counties in North Dakota

Non-highway roads carry a truck concentration that's 23% lower than the highway network.

Slope's average driver income is lower than 52% of counties in North Dakota. Slope's median driver age is lower than 67% of counties in North Dakota.

Time-of-Day & Seasonal Patterns

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Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–8:00 AM and PM peak 2:00 PM–3:00 PM, with volumes reaching approximately 100% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 39% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +14% versus the annual average.
Lowest month:
February is the quietest month, with volumes -21% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Slope County, North Dakota, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +14% in high season.

Slope County vs. North Dakota Traffic Comparison

The average daily traffic per road sets Slope County apart: 65% below the North Dakota average. Its average travel time, by contrast, is 59% above.

MetricSlope CountyNorth Dakota averageDifference
Traffic7642,174-64.9%
Truck % (Total Traffic)13.4%11.1%+20.5%
Truck % (Highway)14.0%14.5%-3.2%
Avg. Travel Time58.9 min37.0 min+59.0%

How Slope County compares

Trips in Slope County run longer than in any nearby county

Against the 4 nearest areas, Slope County is 41.8% less congested and sees 47.1% longer typical trips; it has the third busiest roads of the five. Trips here run longer without running slower: distance, not congestion, is what drivers spend their time on.

Slope County and the 4 nearest county-level areas by centroid distance, with the North Dakota average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Slope County76413.4%55,46258.9 min2.8%
Bowman County, North Dakota1,04611.5%86,20136.8 min3.9%
Billings County, North Dakota1,82216.3%227,67843.4 min6.9%
Golden Valley County, North Dakota68915.5%59,61633.7 min5.1%
Hettinger County, North Dakota5729.6%64,12946.3 min3.4%
North Dakota average2,17411.1%N/A37.0 min10.6%

Slope County ranked within North Dakota

On average travel time, Slope County is among the three highest county-level areas in North Dakota.

Slope County ranked among 53 county-level areas in North Dakota (1 = highest); measures without data in every county rank a smaller field, down to 35.
MeasureSlope CountyNorth Dakota rank
Traffic volume (AADT)764#32 of 53
Highway vehicle-miles per day44,010#25 of 35
Truck share on highways14.0%#23 of 35
Highway trucks per day179#24 of 35
Average travel time58.9 min#2 of 53
Average driver income$77,561#28 of 53
Average driver age45.8 yrs#36 of 53

Busiest roads in Slope County, North Dakota

On their busiest stretches, the three busiest roads in Slope County carry 1,085 vehicles a day on average, 42% more than the typical road in the county (764).

Theodore Roosevelt Expressway is the busiest road, at 1,436 vehicles a day, 204 of them trucks (14.2%). It also carries the most trucks.

1st Street skews older: its drivers' median age is 59.7, compared with 45.8 county-wide.

Trips on Camp Crook Road are short, a median of 23.1 minutes against 58.9 county-wide, so it serves mostly local traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Theodore Roosevelt ExpresswayTrunk road · 1,436vehicles204trucks · 14.2%
Road class
Trunk road
Congestion ratio
2.9%
Median trip time
60.1 min
Drivers’ median age
44.0 yrs
Drivers’ average income
$78,396

Theodore Roosevelt Expressway carries 88% more than the county average at its busiest, 204 of them trucks (14.2%, above the county-wide 13.4%).

22nd StreetTrunk road · 1,143vehicles168trucks · 14.7%
Road class
Trunk road
Congestion ratio
2.6%
Median trip time
64.5 min
Drivers’ median age
45.8 yrs
Drivers’ average income
$77,913

2nd Street carries 50% more than the county average on its busiest stretch, where the median trip lasts 64.5 minutes.

31st StreetPrimary road · 677vehicles74trucks · 10.9%
Road class
Primary road
Median trip time
69.8 min
Drivers’ median age
59.7 yrs
Drivers’ average income
$67,073

1st Street is a quieter road: its busiest stretch carries 11% less than the county average; trucks are 10.9% of it, below the county-wide 13.4%.

4Yellowstone TrailPrimary road · 588vehicles72trucks · 12.2%
Road class
Primary road
Median trip time
56.1 min
Drivers’ median age
59.0 yrs
Drivers’ average income
$62,500

Even at its busiest, Yellowstone Trail carries 23% less than the county average; trucks are 12.2% of it, below the county-wide 13.4%.

5Camp Crook RoadTertiary road · 422vehicles53trucks · 12.6%
Road class
Tertiary road
Median trip time
23.1 min

Camp Crook Road is a quieter road: its busiest stretch carries 45% less than the county average; trucks are 12.6% of it, below the county-wide 13.4%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Theodore Roosevelt ExpresswayTrunk road · #1 by traffic1,436vehicles204trucks · 14.2%
22nd StreetTrunk road · #2 by traffic1,143vehicles168trucks · 14.7%
31st StreetPrimary road · #3 by traffic677vehicles74trucks · 10.9%
4Yellowstone TrailPrimary road · #4 by traffic588vehicles72trucks · 12.2%
5Camp Crook RoadTertiary road · #5 by traffic422vehicles53trucks · 12.6%
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

SlopeDepartment 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 Slope County

The same traffic breakdown for the areas closest to Slope County, North Dakota.

Need segment-level traffic data?

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