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Traffic heat map of Custer County, Montana: 259 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Haynes Avenue and Main Street

Custer County, Montana Traffic Counts

Its busiest road, Haynes Avenue, carries 8,578 vehicles a day, 3.8 times the average road. This page breaks down traffic in Custer County, Montana across 259 miles of monitored roads split into 634 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 Custer County, Montana

Traffic

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

vehicles per day2,274
Trucks

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

15.3%
Average travel time

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

35.0 min
Congestion ratio

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

10.2%
Drivers’ average age

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

50.0 yrs
Drivers’ average income

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

$67,658

A typical monitored road in Custer County, Montana sees 2,274 vehicles per day, while its 259 miles of monitored roads together handle 375,965 vehicle-miles traveled per day (≈137 million per year). At 15.3%, the truck share runs above the 11.7% across Montana: about 1 in 7 vehicles.

Shorter trips than 82% of counties in Montana

Custer sees 46% lower average daily traffic volume than the state average (2,274 vehicles per day against 4,202), suggesting less demand on each road - lighter roads for freight, but less passing trade for roadside retail. Network-wide, Custer accounts for about 1.3% of Montana's statewide total of vehicle-miles. Custer carries more traffic than 69% of counties in Montana.

At 35.0 minutes, the average travel time matches the state level closely. 82% of counties in Montana have a longer average travel time than Custer's 35.0 minutes.

Congestion runs 17% lower than the state level, at a ratio of 10.2%, which means smoother traffic flow - crucial for traffic control improvement and logistics planning.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Custer County, Montana

Trafficvehicles per day1,864
Trucks17.8%
Average travel time35.4 min
Congestion ratio4.4%
Drivers’ average age56.0 yrs
Drivers’ average income$65,918

A little more than half of the driving in Custer County, Montana happens on highways: 70% of all vehicle-miles. The average highway carries 1,864 vehicles per day, 20% less than the average non-highway road in the same area, which carries 2,334 vehicles per day.

With 46% of the road miles (119 miles in 82 segments), highways punch above their length, carrying 261,440 vehicle-miles traveled per day (≈95.4 million per year).

That is more highway travel volume than 59% of counties in Montana.

Higher highway truck share than 65% of counties in Montana

Highway truck concentration here runs 19% higher than the state average, at 17.8%. Highways here lean toward freight, so highway access is a real asset for logistics operators.

Custer's highway truck share (17.8%) is higher than 65% of counties in Montana. By raw truck volume, Custer carries more highway trucks than 59% of counties in Montana.

non-highway traffic icon

Non-highway Traffic in Custer County, Montana

Trafficvehicles per day2,334
Trucks9.7%
Average travel time34.9 min
Congestion ratio11.0%
Drivers’ average age49.8 yrs
Drivers’ average income$68,971

Local roads carry a significant share of travel in Custer County, Montana: 30% of all vehicle-miles. A typical local road sees 2,334 vehicles per day.

Local roads make up 54% of the monitored road miles (140 miles in 552 segments) but carry less than their share of travel: 114,525 vehicle-miles traveled per day (≈41.8 million per year). Trucks make up 9.7% of non-highway traffic, about 1 in 10 vehicles.

Local roads carry 46% fewer trucks by share than highways

Compared to highways, non-highway routes see 46% fewer trucks by share.

Non-highway congestion (11.0%) runs slightly lower than the state level (9% lower).

Custer's average driver income is higher than 51% of counties in Montana. 58% of counties in Montana have an older driver population than Custer.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 7:00 AM to 12:00 PM and a long afternoon plateau from 2:00 PM to 6:00 PM, with volumes reaching approximately 60% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 22% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +34% versus the annual average.
Lowest month:
January is the quietest month, with volumes -41% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Custer County, Montana, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +34% in high season.

Custer County vs. Montana Traffic Comparison

Of the four measures, average daily traffic per road differs most: Custer County runs 46% below the Montana average. Its truck share, by contrast, is 31% above.

MetricCuster CountyMontana averageDifference
Traffic2,2744,202-45.9%
Truck % (Total Traffic)15.3%11.7%+31.0%
Truck % (Highway)17.8%15.0%+18.6%
Avg. Travel Time35.0 min36.2 min-3.3%

How Custer County compares

Custer County is more congested than any nearby county

Compared with its 4 closest neighbours, Custer County is 118.8% more congested and carries 65.6% more traffic on a typical road; it has the busiest roads of the five. It is where traffic concentrates in this corner of the map - the local bottleneck, with more vehicles per road AND less room to absorb them.

Custer County and the 4 nearest county-level areas by centroid distance, with the Montana average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Custer County2,27415.3%375,96535.0 min10.2%
Prairie County, Montana93919.3%168,15542.3 min3.7%
Fallon County, Montana1,05910.5%55,08439.9 min4.1%
Powder River County, Montana1,96817.5%167,76044.2 min6.3%
Rosebud County, Montana1,52418.4%345,80743.1 min4.6%
Montana average4,20211.7%N/A36.2 min12.3%

Custer County ranked within Montana

Custer County sits in the bottom quarter of the Montana field on average travel time, at #46 of 56.

Custer County ranked among 56 county-level areas in Montana (1 = highest); measures without data in every county rank a smaller field, down to 47.
MeasureCuster CountyMontana rank
Traffic volume (AADT)2,274#18 of 56
Highway vehicle-miles per day261,440#20 of 47
Truck share on highways17.8%#17 of 47
Highway trucks per day331#20 of 47
Average travel time35.0 min#46 of 56
Average driver income$67,658#28 of 56
Average driver age50.0 yrs#33 of 56

Busiest roads in Custer County, Montana

On their busiest stretches, the three busiest roads in Custer County carry 6,265 vehicles a day on average, 2.8 times the typical road in the county (2,274).

Haynes Avenue is the busiest road, at 8,578 vehicles a day, 343 of them trucks (4.0%). I 94 carries the most trucks, 738 a day (17.2% of its traffic), although it ranks #3 for all traffic.

Lewis and Clark Trail carries longer journeys than most roads here, with a median trip of 71.4 minutes against 35.0 county-wide.

Haynes Avenue is busy with cars rather than freight: only 4.0% of its traffic is trucks, against 15.3% county-wide.

Drivers on Lewis and Clark Trail come from neighborhoods with an average household income of $46,115, 32% below the county average of $67,658.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Haynes AvenuePrimary road · 8,578vehicles343trucks · 4.0%
Road class
Primary road
Congestion ratio
19.5%
Median trip time
32.3 min
Drivers’ median age
50.2 yrs
Drivers’ average income
$66,323

Haynes Avenue is one of the more congested roads here: trips take 19% longer than at free-flow speed, against 10% county-wide.

2Main StreetPrimary road · 5,938vehicles282trucks · 4.8%
Road class
Primary road
Congestion ratio
14.1%
Median trip time
34.7 min
Drivers’ median age
49.7 yrs
Drivers’ average income
$65,058

On its busiest stretch, Main Street carries 2.6 times the county average; trucks are 4.8% of it, below the county-wide 15.3%.

3I 94Motorway · 4,278vehicles738trucks · 17.2%
Road class
Motorway
Congestion ratio
4.6%
Median trip time
41.2 min
Drivers’ median age
55.7 yrs
Drivers’ average income
$64,815

At 88% more than the county average, I 94 draws drivers from neighborhoods averaging $64,815 in household income.

47th StreetPrimary road · 3,518vehicles137trucks · 3.9%
Road class
Primary road
Congestion ratio
7.9%
Median trip time
30.0 min
Drivers’ median age
49.5 yrs
Drivers’ average income
$67,111

7th Street is busy by local standards, at 55% more than the county average on its busiest stretch; trucks are 3.9% of it, below the county-wide 15.3%.

5Valley DrivePrimary road · 2,280vehicles98trucks · 4.3%
Road class
Primary road
Congestion ratio
4.5%
Median trip time
37.6 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$69,708

Even at its busiest, Valley Drive carries about the same as the county average; trucks are 4.3% of it, below the county-wide 15.3%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 94Motorway · #3 by traffic4,278vehicles738trucks · 17.2%
2Lewis and Clark TrailMotorway · 1,913vehicles385trucks · 20.1%
Road class
Motorway
Median trip time
71.4 min
Drivers’ median age
55.6 yrs
Drivers’ average income
$46,115

Lewis and Clark Trail is a quieter road: its busiest stretch carries 16% less than the county average; trucks are 20.1% of it, above the county-wide 15.3%.

3Haynes AvenuePrimary road · #1 by traffic8,578vehicles343trucks · 4.0%
4Main StreetPrimary road · #2 by traffic5,938vehicles282trucks · 4.8%
57th StreetPrimary road · #4 by traffic3,518vehicles137trucks · 3.9%
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

CusterDepartment 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 Custer County

The same traffic breakdown for the areas closest to Custer County, Montana.

Need segment-level traffic data?

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