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Traffic heat map of Petroleum County, Montana: 56 miles of roads shaded from blue (light) to red (heavy traffic), busiest on MT 200 and Broadway Avenue

Petroleum County, Montana Traffic Counts

Traffic analytics for Petroleum County, Montana, calculated from real-world mobile and sensor networks on 117 road segments (56 road miles, about 2,540 ft each). Its roads are the quietest of any county in Montana, at 416 vehicles a day on average. Use the figures below to move from assumptions to certainty on retail locations, logistics and road planning.
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 Petroleum County, Montana

Traffic

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

vehicles per day416
Trucks

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

11.3%
Average travel time

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

48.6 min
Drivers’ average age

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

55.2 yrs
Drivers’ average income

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

$59,318

The average monitored road in Petroleum County, Montana carries 416 vehicles per day. Across its 56 miles of monitored roads, that adds up to 28,306 vehicle-miles traveled per day (≈10.3 million per year). About 1 in 9 vehicles is a truck, in line with Montana (11.7%).

The quietest roads of any county in Montana

Petroleum sees 90% lower average daily traffic volume than the state average (416 vehicles per day against 4,202), suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Petroleum accounts for less than 0.1% of Montana's statewide total of vehicle-miles. At 416 vehicles per day, Petroleum posts the lowest average traffic volume in Montana.

The average trip takes 48.6 minutes, 34% higher than the state level. Its average travel time of 48.6 minutes is longer than 85% of counties in Montana.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Petroleum County, Montana, the peak hour concentrates about 8% of the day's traffic.

Petroleum County vs. Montana Traffic Comparison

The average daily traffic per road sets Petroleum County apart: 90% below the Montana average. Its average travel time, by contrast, is 34% above.

MetricPetroleum CountyMontana averageDifference
Traffic4164,202-90.1%
Truck % (Total Traffic)11.3%11.7%-3.0%
Avg. Travel Time48.6 min36.2 min+34.5%

How Petroleum County compares

Petroleum County moves the least traffic of its nearby counties

Set against the average of the 4 areas nearest to it, Petroleum County carries 71.9% less traffic on a typical road and moves 28.6% of the total daily travel; it has the quietest roads of the five. Smaller and quieter on both counts: a shorter network than the areas around it, carrying lighter traffic across it.

Petroleum 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
Petroleum County41611.3%28,30648.6 minN/A
Fergus County, Montana2,26211.4%213,06538.8 min8.7%
Musselshell County, Montana1,71210.2%84,84649.9 min5.5%
Garfield County, Montana49115.7%43,72468.6 min4.6%
Golden Valley County, Montana1,46015.1%53,60861.8 min4.9%
Montana average4,20211.7%N/A36.2 min12.3%

Petroleum County ranked within Montana

Petroleum County records the lowest average daily traffic volume in Montana.

Petroleum County ranked among 56 county-level areas in Montana (1 = highest).
MeasurePetroleum CountyMontana rank
Traffic volume (AADT)416#56 of 56
Average travel time48.6 min#9 of 56
Average driver income$59,318#46 of 56
Average driver age55.2 yrs#10 of 56

Petroleum County ranks #9 of 56 on average travel time but #56 of 56 on average daily traffic volume - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Petroleum County, Montana

On their busiest stretches, the three busiest roads in Petroleum County carry 563 vehicles a day on average, 35% more than the typical road in the county (416).

MT 200 leads with 633 vehicles a day, 71 of them trucks (11.3%). It also carries the most trucks.

US 87 carries longer journeys than most roads here, with a median trip of 183.4 minutes against 48.6 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1MT 200Primary road · 633vehicles71trucks · 11.3%
Road class
Primary road
Median trip time
47.4 min
Drivers’ median age
55.2 yrs
Drivers’ average income
$59,318

MT 200 is busy by local standards, at 52% more than the county average on its busiest stretch; trucks are 11.3% of it, in line with the county-wide 11.3%.

2Broadway AvenueSecondary road · 572vehicles40trucks · 7.1%
Road class
Secondary road
Median trip time
41.7 min
Drivers’ median age
55.2 yrs
Drivers’ average income
$59,318

Broadway Avenue peaks at 572 vehicles a day, 38% more than the county average; trucks are 7.1% of it, below the county-wide 11.3%.

3US 87Primary road · 484vehicles70trucks · 14.5%
Road class
Primary road
Median trip time
183.4 min

US 87 carries 17% more than the county average on its busiest stretch, where the median trip lasts 183.4 minutes.

4MT 244Secondary road · 186vehicles17trucks · 9.3%
Road class
Secondary road
Median trip time
59.8 min
Drivers’ median age
55.2 yrs
Drivers’ average income
$59,318

MT 244 is a quieter road: its busiest stretch carries 55% less than the county average; trucks are 9.3% of it, below the county-wide 11.3%.

5Main StreetSecondary road · 180vehicles19trucks · 10.4%
Road class
Secondary road
Median trip time
38.8 min
Drivers’ median age
55.2 yrs
Drivers’ average income
$59,318

Even at its busiest, Main Street carries 57% less than the county average; trucks are 10.4% of it, below the county-wide 11.3%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1MT 200Primary road · #1 by traffic633vehicles71trucks · 11.3%
2US 87Primary road · #3 by traffic484vehicles70trucks · 14.5%
3Broadway AvenueSecondary road · #2 by traffic572vehicles40trucks · 7.1%
4Main StreetSecondary road · #5 by traffic180vehicles19trucks · 10.4%
5MT 244Secondary road · #4 by traffic186vehicles17trucks · 9.3%
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

PetroleumDepartment 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 Petroleum County

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

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