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Traffic heat map of Whitman County, Washington: 344 miles of roads shaded from blue (light) to red (heavy traffic), busiest on State Route 270 and Grand Avenue

Whitman County, Washington Traffic Counts

Its drivers are the youngest of any county in Washington, a median 26 years. This page breaks down traffic in Whitman County, Washington across 344 miles of monitored roads split into 3,115 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 Whitman County, Washington

Traffic

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

vehicles per day3,424
Trucks

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

9.2%
Average travel time

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

35.4 min
Congestion ratio

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

11.1%
Drivers’ average age

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

25.8 yrs
Drivers’ average income

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

$55,931

A typical monitored road in Whitman County, Washington sees 3,424 vehicles per day, while its 344 miles of monitored roads together handle 837,137 vehicle-miles traveled per day (≈306 million per year). At 9.2%, the truck share runs above the 7.1% across Washington: about 1 in 11 vehicles.

Traffic 53% below the Washington average

Whitman sees 53% lower average daily traffic volume than the state average (3,424 vehicles per day against 7,322), suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 0.5% of Washington's statewide total. Whitman carries less traffic than 58% of counties in Washington.

Journey times run 7% higher than the state level, at 35.4 minutes on average. 76% of counties in Washington have a shorter average travel time than Whitman's 35.4 minutes.

Congestion runs 44% lower than the state level, at a ratio of 11.1%, which means smoother traffic flow - travel times are easy to plan around for scheduled deliveries.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Whitman County, Washington

Trafficvehicles per day6,286
Trucks11.6%
Average travel time51.4 min
Congestion ratio14.9%
Drivers’ average age34.9 yrs
Drivers’ average income$66,657

Highways carry about half of all travel in Whitman County, Washington, 47% of vehicle-miles. The average highway carries 6,286 vehicles per day, 111% more than the average non-highway road in the same area, which carries 2,976 vehicles per day.

Highways make up 20% of the monitored road miles (68 miles, 421 segments), so they carry more than their share: 389,369 vehicle-miles traveled per day (≈142 million per year).

Higher highway truck share than 69% of counties in Washington

At 11.6%, highway truck share is 22% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

69% of counties in Washington see a lower highway truck share than Whitman's 11.6%. Whitman's highway truck count is lower than 62% of counties in Washington, at roughly 727 trucks per day.

non-highway traffic icon

Non-highway Traffic in Whitman County, Washington

Trafficvehicles per day2,976
Trucks7.0%
Average travel time32.9 min
Congestion ratio10.6%
Drivers’ average age24.9 yrs
Drivers’ average income$51,179

Local roads carry about half of all travel in Whitman County, Washington, 53% of vehicle-miles. A typical local road sees 2,976 vehicles per day.

Local roads make up 80% of the monitored road miles (275 miles in 2,694 segments) but carry less than their share of travel: 447,768 vehicle-miles traveled per day (≈163 million per year). Trucks make up 7.0% of non-highway traffic, about 1 in 14 vehicles.

The youngest drivers of any county in Washington

The concentration of trucks on non-highway roads is 39% lower than on highways.

At 46% lower than the state level, the non-highway congestion ratio of 10.6% signals easier movement on local roads.

Trip origins here have lower average income than 97% of counties in Washington. Whitman has the lowest median driver age in Washington - 26 years.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 8:00 AM to 12:00 PM and PM peak 3:00 PM–5:00 PM, with volumes reaching approximately 84% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 18% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +8% versus the annual average.
Lowest month:
January is the quietest month, with volumes -15% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Whitman County, Washington, the peak hour concentrates about 8% of the day's traffic, and there is a noticeable seasonal swing of +8% in high season.

Whitman County vs. Washington Traffic Comparison

Of the four measures, average daily traffic per road differs most: Whitman County runs 53% below the Washington average. Its truck share, by contrast, is 29% above.

MetricWhitman CountyWashington averageDifference
Traffic3,4247,322-53.2%
Truck % (Total Traffic)9.2%7.1%+28.5%
Truck % (Highway)11.6%9.5%+21.6%
Avg. Travel Time35.4 min33.2 min+6.6%

How Whitman County compares

Whitman County moves more traffic than any nearby county

Against the 4 nearest areas, Whitman County moves 4.4 times the total daily travel; it has the second 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.

Whitman County and the 4 nearest county-level areas by centroid distance, with the Washington average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Whitman County3,4249.2%837,13735.4 min11.1%
Garfield County, Washington1,87313.2%70,25157.5 min5.6%
Latah County, Idaho3,8417.5%416,48830.0 min17.3%
Columbia County, Washington2,03511.1%78,69744.4 min7.2%
Asotin County, Washington3,3065.7%200,35628.8 min12.3%
Washington average7,3227.1%N/A33.2 min19.9%

Whitman County ranked within Washington

No county-level area in Washington records a lower average driver age than Whitman County.

Whitman County ranked among 39 county-level areas in Washington (1 = highest); measures without data in every county rank a smaller field, down to 33.
MeasureWhitman CountyWashington rank
Traffic volume (AADT)3,424#23 of 39
Highway vehicle-miles per day389,369#25 of 33
Truck share on highways11.6%#11 of 33
Highway trucks per day727#21 of 33
Average travel time35.4 min#10 of 39
Average driver income$55,931#38 of 39
Average driver age25.8 yrs#39 of 39

The two ends of this table sit far apart: #10 of 39 on average travel time, against #39 of 39 on average driver age.

Busiest roads in Whitman County, Washington

The three busiest roads in Whitman County average 12,605 vehicles a day, 3.7 times the county average of 3,424 across all its monitored roads.

State Route 270 is the busiest road, at 13,135 vehicles a day, 718 of them trucks (5.5%). Grand Avenue is practically level with it at 12,875. James Street carries the most trucks, 936 a day (7.9% of its traffic), although it ranks #3 for all traffic.

Montgomery Street skews older: its drivers' median age is 47.4, compared with 25.8 county-wide.

Montgomery Street carries longer journeys than most roads here, with a median trip of 84.8 minutes against 35.4 county-wide.

Montgomery Street draws drivers from wealthier areas: their neighborhoods average $82,724 in household income, 48% above the county's $55,931.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1State Route 270Primary road · 13,135vehicles718trucks · 5.5%
Road class
Primary road
Congestion ratio
14.6%
Median trip time
27.4 min
Drivers’ median age
25.6 yrs
Drivers’ average income
$48,911

State Route 270 peaks at 13,135 vehicles a day, 3.8 times the county average; trucks are 5.5% of it, below the county-wide 9.2%.

2Grand AvenuePrimary road · 12,875vehicles707trucks · 5.5%
Road class
Primary road
Congestion ratio
24.8%
Median trip time
29.4 min
Drivers’ median age
24.9 yrs
Drivers’ average income
$53,251

Grand Avenue carries 3.8 times the county average at its busiest, 707 of them trucks (5.5%, below the county-wide 9.2%).

3James StreetTrunk road · 11,803vehicles936trucks · 7.9%
Road class
Trunk road
Congestion ratio
36.9%
Median trip time
52.1 min
Drivers’ median age
25.4 yrs
Drivers’ average income
$59,669

Delays build on James Street: its congestion ratio of 37% over free-flow time is well above the county's 11%.

4Main StreetTrunk road · 10,842vehicles887trucks · 8.2%
Road class
Trunk road
Congestion ratio
20.9%
Median trip time
49.5 min
Drivers’ median age
36.3 yrs
Drivers’ average income
$63,933

Drivers on Main Street are on long journeys, a median 49.5 minutes against 35.4 county-wide: a through route more than a local street.

5Southeast Bishop BoulevardTertiary road · 10,595vehicles322trucks · 3.0%
Road class
Tertiary road
Congestion ratio
30.9%
Median trip time
29.2 min
Drivers’ median age
25.1 yrs
Drivers’ average income
$48,891

Travel on Southeast Bishop Boulevard's busiest stretch runs 31% over free-flow time, against 11% across the county, so expect slower peak hours.

Ranked by trucks per day

Cars and light vehiclesTrucks
1James StreetTrunk road · #3 by traffic11,803vehicles936trucks · 7.9%
2Main StreetTrunk road · #4 by traffic10,842vehicles887trucks · 8.2%
3US 195Trunk road · 6,747vehicles733trucks · 10.9%
Road class
Trunk road
Congestion ratio
15.0%
Median trip time
48.3 min
Drivers’ median age
32.7 yrs
Drivers’ average income
$65,848

US 195 carries 2.0 times the county average on its busiest stretch, where the median trip lasts 48.3 minutes.

4Montgomery StreetTrunk road · 5,355vehicles725trucks · 13.5%
Road class
Trunk road
Congestion ratio
16.8%
Median trip time
84.8 min
Drivers’ median age
47.4 yrs
Drivers’ average income
$82,724

At 56% more than the county average, Montgomery Street draws drivers from neighborhoods averaging $82,724 in household income.

5State Route 270Primary road · #1 by traffic13,135vehicles718trucks · 5.5%
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

WhitmanDepartment 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 Whitman County

The same traffic breakdown for the areas closest to Whitman County, Washington.

Need segment-level traffic data?

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