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Traffic heat map of Carbon County, Montana: 189 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 212 and Main Street

Carbon County, Montana Traffic Counts

Our Carbon County, Montana traffic data covers 1,376 road segments over 189 road miles, with an average segment of just 726 ft. Its busiest road, US 212, carries 7,176 vehicles a day, 3.1 times the average road. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
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 Carbon County, Montana

Traffic

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

vehicles per day2,307
Trucks

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

9.5%
Average travel time

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

38.9 min
Congestion ratio

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

6.6%
Drivers’ average age

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

51.4 yrs
Drivers’ average income

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

$69,388

A typical monitored road in Carbon County, Montana sees 2,307 vehicles per day, while its 189 miles of monitored roads together handle 404,057 vehicle-miles traveled per day (≈147 million per year). Trucks are a smaller part of the mix than across Montana: 9.5% against 11.7%.

Congestion 46% below the Montana average

Carbon sees 45% lower average daily traffic volume than the state average (2,307 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, Carbon accounts for about 1.4% of Montana's statewide total of vehicle-miles. Carbon carries more traffic than 71% of counties in Montana.

At 38.9 minutes, the average travel time is 7% higher than the state level. 51% of counties in Montana have a longer average travel time than Carbon's 38.9 minutes.

At 46% lower than the state level, the 6.6% congestion ratio signals smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Carbon County, Montana

Trafficvehicles per day3,182
Trucks10.5%
Average travel time53.0 min
Congestion ratio8.1%
Drivers’ average age49.4 yrs
Drivers’ average income$67,190

Highways carry about half of all travel in Carbon County, Montana, 48% of vehicle-miles. The average highway carries 3,182 vehicles per day, 56% more than the average non-highway road in the same area, which carries 2,034 vehicles per day.

Highways make up 33% of the monitored road miles (63 miles, 327 segments), so they carry more than their share: 192,268 vehicle-miles traveled per day (≈70.2 million per year).

By highway travel volume, Carbon outranks 50% of counties in Montana.

Lower highway truck share than 90% of counties in Montana

At 10.5%, highway truck share is 30% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

90% of counties in Montana see a higher highway truck share than Carbon's 10.5%. 59% of counties in Montana see more highway trucks per day than Carbon's roughly 334.

non-highway traffic icon

Non-highway Traffic in Carbon County, Montana

Trafficvehicles per day2,034
Trucks8.6%
Average travel time34.5 min
Congestion ratio6.2%
Drivers’ average age54.0 yrs
Drivers’ average income$71,087

Local roads carry about half of all travel in Carbon County, Montana, 52% of vehicle-miles. The average non-highway road carries 2,034 vehicles per day.

Spread over 126 miles and 1,049 segments, 67% of the road network, local roads carry a lighter load per mile: 211,790 vehicle-miles traveled per day (≈77.3 million per year). The truck share on non-highway roads is 8.6%.

Local congestion 49% below the Montana average

Non-highway roads carry a truck concentration that's 18% lower than the highway network.

Non-highway congestion (6.2%) runs 49% lower than the state average, pointing to smoother local traffic flow.

Trip origins here have higher average income than 60% of counties in Montana. Carbon's median driver age is higher than 55% of counties in Montana.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 9:00 AM–12:00 PM and PM peak 5:00 PM–6:00 PM, with volumes reaching approximately 101% higher than the daily average.
Weekend traffic:
Weekend traffic is about as busy as on weekdays (+0%): leisure and through trips largely replace the commute.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +36% versus the annual average.
Lowest month:
January is the quietest month, with volumes -26% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Carbon County, Montana, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +36% in high season.

Carbon County vs. Montana Traffic Comparison

The average daily traffic per road sets Carbon County apart: 45% below the Montana average. Its highway truck share is also 30% below.

MetricCarbon CountyMontana averageDifference
Traffic2,3074,202-45.1%
Truck % (Total Traffic)9.5%11.7%-18.4%
Truck % (Highway)10.5%15.0%-29.9%
Avg. Travel Time38.9 min36.2 min+7.5%

How Carbon County compares

Carbon County moves the least traffic of its nearby counties

Set against the average of the 4 areas nearest to it, Carbon County is 44.7% less congested and moves 32.1% of the total daily travel; it has the third busiest roads of the five. Less traffic and more room for it - the roads here run both quieter and freer than the areas around them.

Carbon 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
Carbon County2,3079.5%404,05738.9 min6.6%
Stillwater County, Montana1,67418.6%544,51435.5 min6.6%
Sweet Grass County, Montana1,67520.8%510,31543.6 min6.1%
Yellowstone County, Montana6,4718.5%3,250,72434.2 min16.0%
Park County, Wyoming3,1257.8%722,36629.0 min19.3%
Montana average4,20211.7%N/A36.2 min12.3%

Carbon County ranked within Montana

Carbon County sits in the bottom quarter of the Montana field on truck share on highways, at #42 of 47.

Carbon County ranked among 56 county-level areas in Montana (1 = highest); measures without data in every county rank a smaller field, down to 47.
MeasureCarbon CountyMontana rank
Traffic volume (AADT)2,307#17 of 56
Highway vehicle-miles per day192,268#24 of 47
Truck share on highways10.5%#42 of 47
Highway trucks per day334#28 of 47
Average travel time38.9 min#29 of 56
Average driver income$69,388#23 of 56
Average driver age51.4 yrs#26 of 56

The two ends of this table sit far apart: #17 of 56 on average daily traffic volume, against #42 of 47 on truck share on highways.

Busiest roads in Carbon County, Montana

The three busiest roads in Carbon County average 5,916 vehicles a day, 2.6 times the county average of 2,307 across all its monitored roads.

US 212 leads with 7,176 vehicles a day, 661 of them trucks (9.2%). It also carries the most trucks.

Trips using Billings Avenue are long: a median of 70.0 minutes against 38.9 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 212Trunk road · 7,176vehicles661trucks · 9.2%
Road class
Trunk road
Congestion ratio
8.1%
Median trip time
47.1 min
Drivers’ median age
49.3 yrs
Drivers’ average income
$70,732

US 212 carries 3.1 times the county average at its busiest, 661 of them trucks (9.2%, in line with the county-wide 9.5%).

2Main StreetTrunk road · 5,322vehicles458trucks · 8.6%
Road class
Trunk road
Congestion ratio
15.3%
Median trip time
50.9 min
Drivers’ median age
50.6 yrs
Drivers’ average income
$52,143

Travel on Main Street's busiest stretch runs 15% over free-flow time, against 7% across the county, so expect slower peak hours.

3Billings AvenueTrunk road · 5,250vehicles519trucks · 9.9%
Road class
Trunk road
Congestion ratio
13.0%
Median trip time
70.0 min
Drivers’ median age
50.1 yrs
Drivers’ average income
$63,400

Billings Avenue carries 2.3 times the county average on its busiest stretch, where the median trip lasts 70.0 minutes.

4US 310Trunk road · 4,190vehicles438trucks · 10.4%
Road class
Trunk road
Congestion ratio
9.1%
Median trip time
64.2 min
Drivers’ median age
50.3 yrs
Drivers’ average income
$59,781

Drivers on US 310 are on long journeys, a median 64.2 minutes against 38.9 county-wide: a through route more than a local street.

5Broadway AvenuePrimary road · 3,995vehicles250trucks · 6.2%
Road class
Primary road
Congestion ratio
9.2%
Median trip time
21.6 min
Drivers’ median age
56.3 yrs
Drivers’ average income
$68,083

Broadway Avenue is a local road at heart: the median trip using it lasts 21.6 minutes, against 38.9 for the county.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 212Trunk road · #1 by traffic7,176vehicles661trucks · 9.2%
2Billings AvenueTrunk road · #3 by traffic5,250vehicles519trucks · 9.9%
3Main StreetTrunk road · #2 by traffic5,322vehicles458trucks · 8.6%
4US 310Trunk road · #4 by traffic4,190vehicles438trucks · 10.4%
5Front AvenuePrimary road · 3,927vehicles298trucks · 7.6%
Road class
Primary road
Congestion ratio
8.8%
Median trip time
39.9 min
Drivers’ median age
51.4 yrs
Drivers’ average income
$75,138

Front Avenue carries 70% more than the county average on its busiest stretch, where the median trip lasts 39.9 minutes.

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

CarbonDepartment 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 Carbon County

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

Need segment-level traffic data?

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