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Traffic heat map of Washington: roads over 1,000 vehicles a day shaded from blue (light) to red (heavy traffic), busiest on I 5 and I 405

Washington Traffic Counts

Our Washington traffic data covers 494,492 road segments over 22,344 road miles, with an average segment of just 239 ft. Its busiest road, I 5 in King County, carries 179,635 vehicles a day, 24.5 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 icon

Total Traffic Volume & Performance in Washington

Traffic

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

vehicles per day7,322
Trucks

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

7.1%
Average travel time

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

33.2 min
Congestion ratio

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

19.9%
Drivers’ average age

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

43.9 yrs
Drivers’ average income

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

$101,368

The average monitored road in Washington carries 7,322 vehicles per day. Across its 22,344 miles of monitored roads, that adds up to 155,256,676 vehicle-miles traveled per day (≈56.7 billion per year). Trucks are a smaller part of the mix than across the US: 7.1% against 9.3%.

Busier roads than 68% of states nationwide

Washington's average daily traffic volume of 7,322 vehicles per day is on par with the national average of 6,986. Network-wide, Washington accounts for about 2.0% of the national total of vehicle-miles. Washington carries more traffic than 68% of states nationwide.

Journey times here (33.2 minutes on average) closely track the national level. On travel time, Washington runs shorter than 54% of states nationwide.

The congestion ratio of 19.9% runs slightly higher than the national level (5% higher).

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Washington

Trafficvehicles per day17,420
Trucks9.5%
Average travel time40.5 min
Congestion ratio44.8%
Drivers’ average age45.0 yrs
Drivers’ average income$99,247

Travel in Washington splits roughly evenly, with about half of it (47% of vehicle-miles) on highways. The average highway carries 17,420 vehicles per day, 151% more than the average non-highway road in the same area, which carries 6,931 vehicles per day.

Highways make up 18% of the monitored road miles (3,958 miles, 18,427 segments), so they carry more than their share: 73,065,771 vehicle-miles traveled per day (≈26.7 billion per year).

That is more highway travel volume than 66% of states nationwide.

Lower highway truck share than 88% of states nationwide

The concentration of trucks on highways (9.5%) is 27% lower than the national average for similar road classifications. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

88% of states nationwide see a higher highway truck share than Washington's 9.5%. Washington's highway truck count is lower than 52% of states nationwide, at roughly 1,657 trucks per day.

non-highway traffic icon

Non-highway Traffic in Washington

Trafficvehicles per day6,931
Trucks5.0%
Average travel time33.0 min
Congestion ratio19.6%
Drivers’ average age43.7 yrs
Drivers’ average income$103,010

Travel in Washington splits roughly evenly, with about half of it (53% of vehicle-miles) on local roads. The average non-highway road carries 6,931 vehicles per day.

Local roads make up 82% of the monitored road miles (18,386 miles in 476,065 segments) but carry less than their share of travel: 82,190,905 vehicle-miles traveled per day (≈30.0 billion per year). Trucks make up 5.0% of non-highway traffic, about 1 in 20 vehicles.

Younger drivers than 84% of states nationwide

Non-highway roads carry a truck concentration that's 48% lower than the highway network.

Non-highway congestion (19.6%) runs slightly higher than the national level (7% higher).

Trip origins here have higher average income than 78% of states nationwide. 84% of states nationwide have an older driver population than Washington.

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 PM peak 3:00 PM–5:00 PM, with volumes reaching approximately 83% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 11% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +9% versus the annual average.
Lowest month:
January is the quietest month, with volumes -10% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Washington, the peak hour concentrates about 8% of the day's traffic, and there is a noticeable seasonal swing of +9% in high season.

Washington vs. United States Traffic Comparison

The highway truck share sets Washington apart: 27% below the United States average. Its truck share is also 24% below.

MetricWashingtonUnited States averageDifference
Traffic7,3226,986+4.8%
Truck % (Total Traffic)7.1%9.3%-23.9%
Truck % (Highway)9.5%13.1%-27.2%
Avg. Travel Time33.2 min33.3 min-0.4%

How Washington compares

Washington moves more traffic than any nearby state

Compared with its 4 closest neighbours, Washington moves 2.5 times the total daily travel; it has the second busiest roads of the five. It is bigger rather than busier: the extra travel comes from carrying more road, not from heavier roads.

Washington and the 4 nearest states by centroid distance, with the United States average for scale.
StateAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Washington7,3227.1%155,256,67633.2 min19.9%
Oregon5,9089.2%86,863,90434.3 min16.6%
Idaho5,7349.7%45,169,44433.8 min16.0%
Montana4,20211.7%28,466,94436.2 min12.3%
Utah10,1988.9%87,040,46632.2 min21.2%
United States average6,9869.3%N/A33.3 min18.9%

Busiest counties in Washington

Washington's three busiest counties account for 48.0% of all the vehicle-miles measured in the state.

Ranked by daily vehicle-miles, across the 39 counties in Washington with a published traffic page. Vehicle-miles is total travel, so this ranks by traffic MOVED rather than by how busy a typical road is.
CountyDaily vehicle-milesAverage daily trafficTruck shareRoad miles
1. King County40,799,39510,7245.9%2,742
2. Pierce County17,922,0519,2425.9%1,601
3. Snohomish County15,764,1988,2145.7%1,420

Most truck-intensive counties in Washington

Washington's five most truck-intensive counties account for 12.7% of the truck vehicle-miles driven in the state.

Ranked by truck share of all traffic, across the same 39 counties, shown with the traffic volume that share is measured against.
CountyTruck shareTruck share on highwaysAverage daily trafficDaily vehicle-miles
1. Adams County17.6%20.1%2,5231,620,370
2. Kittitas County16.3%18.1%3,7113,473,823
3. Lincoln County14.4%19.0%1,381715,271
4. Garfield County13.2%13.2%1,87370,251
5. Cowlitz County12.3%15.5%5,1203,588,922

Asking the same question of truck vehicle-miles gives a different answer - King County, Pierce County, Snohomish County, Spokane County and Kittitas County, together 50.0% of all truck travel in Washington.

Busiest roads in Washington

Traffic concentrates on a few corridors: the three busiest roads average 158,911 vehicles a day, against 7,322 on the average road in Washington.

I 5 in King County leads with 179,635 vehicles a day, 13,209 of them trucks (7.3%). It also carries the most trucks.

Freight stands out on I 5 in Cowlitz County and I 5 in Lewis County: trucks are 15.9% and 13.7% of the traffic there, against 7.1% state-wide.

Drivers on Channel Bridge in King County come from neighborhoods with an average household income of $161,660, 59% above the state average of $101,368.

I 5 in Cowlitz County carries longer journeys than most roads here, with a median trip of 52.1 minutes against 33.2 state-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 5King County · Motorway · 179,635vehicles13,209trucks · 7.3%
Road class
Motorway
Congestion ratio
89.0%
Median trip time
42.8 min
Drivers’ median age
41.1 yrs
Drivers’ average income
$99,123

I 5 is one of the more congested roads here: trips take 89% longer than at free-flow speed, against 20% state-wide.

2I 405King County · Motorway · 154,534vehicles8,878trucks · 5.7%
Road class
Motorway
Congestion ratio
83.7%
Median trip time
38.0 min
Drivers’ median age
43.3 yrs
Drivers’ average income
$141,513

Delays build on I 405: its congestion ratio of 84% over free-flow time is well above the state's 20%.

3I 5Pierce County · Motorway · 142,564vehicles11,230trucks · 7.9%
Road class
Motorway
Congestion ratio
81.6%
Median trip time
44.8 min
Drivers’ median age
42.7 yrs
Drivers’ average income
$90,074

A main artery: I 5's busiest stretch carries 19.5 times the state average; trucks are 7.9% of it, above the state-wide 7.1%.

4Channel BridgeKing County · Motorway · 137,651vehicles7,694trucks · 5.6%
Road class
Motorway
Congestion ratio
67.6%
Median trip time
33.5 min
Drivers’ median age
43.0 yrs
Drivers’ average income
$161,660

Channel Bridge is a trunk route for the state, carrying 18.8 times the state average on its busiest stretch; trucks are 5.6% of it, below the state-wide 7.1%.

5I 90King County · Motorway · 130,410vehicles6,259trucks · 4.8%
Road class
Motorway
Congestion ratio
71.1%
Median trip time
34.3 min
Drivers’ median age
42.4 yrs
Drivers’ average income
$156,430

I 90 carries 17.8 times the state average at its busiest, 6,259 of them trucks (4.8%, below the state-wide 7.1%).

6I 5Snohomish County · Motorway · 123,945vehicles9,219trucks · 7.4%
Road class
Motorway
Congestion ratio
78.6%
Median trip time
39.6 min
Drivers’ median age
43.8 yrs
Drivers’ average income
$104,402

I 5 carries 16.9 times the state average on its busiest stretch, where the median trip lasts 39.6 minutes.

7State Route 16Pierce County · Motorway · 119,822vehicles6,722trucks · 5.6%
Road class
Motorway
Congestion ratio
81.1%
Median trip time
42.3 min
Drivers’ median age
44.0 yrs
Drivers’ average income
$94,182

At 16.4 times the state average, State Route 16 draws drivers from neighborhoods averaging $94,182 in household income.

8Mount Baker Ridge TunnelKing County · Motorway · 117,981vehicles5,418trucks · 4.6%
Road class
Motorway
Congestion ratio
78.1%
Median trip time
34.2 min
Drivers’ median age
41.3 yrs
Drivers’ average income
$154,218

A main artery: Mount Baker Ridge Tunnel's busiest stretch carries 16.1 times the state average; trucks are 4.6% of it, below the state-wide 7.1%.

9I 405Snohomish County · Motorway · 115,006vehicles5,390trucks · 4.7%
Road class
Motorway
Congestion ratio
72.4%
Median trip time
36.8 min
Drivers’ median age
43.2 yrs
Drivers’ average income
$129,219

I 405 is a trunk route for the state, carrying 15.7 times the state average on its busiest stretch; trucks are 4.7% of it, below the state-wide 7.1%.

10Ship Canal BridgeKing County · Motorway · 111,303vehicles4,300trucks · 3.9%
Road class
Motorway
Congestion ratio
66.0%
Median trip time
38.2 min
Drivers’ median age
40.7 yrs
Drivers’ average income
$120,913

Ship Canal Bridge carries 15.2 times the state average at its busiest, 4,300 of them trucks (3.9%, below the state-wide 7.1%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 5King County · Motorway · #1 by traffic179,635vehicles13,209trucks · 7.3%
2I 5Pierce County · Motorway · #3 by traffic142,564vehicles11,230trucks · 7.9%
3I 5Thurston County · Motorway · 84,075vehicles9,778trucks · 11.6%
Road class
Motorway
Congestion ratio
63.9%
Median trip time
45.0 min
Drivers’ median age
44.6 yrs
Drivers’ average income
$89,108

Drivers on I 5 are on long journeys, a median 45.0 minutes against 33.2 state-wide: a through route more than a local street.

4I 5Cowlitz County · Motorway · 60,443vehicles9,625trucks · 15.9%
Road class
Motorway
Congestion ratio
44.5%
Median trip time
52.1 min
Drivers’ median age
47.3 yrs
Drivers’ average income
$87,923

I 5 carries 8.3 times the state average on its busiest stretch, where the median trip lasts 52.1 minutes.

5I 5Snohomish County · Motorway · #6 by traffic123,945vehicles9,219trucks · 7.4%
6Valley FreewayKing County · Motorway · 105,747vehicles9,043trucks · 8.6%
Road class
Motorway
Congestion ratio
79.9%
Median trip time
39.4 min
Drivers’ median age
42.4 yrs
Drivers’ average income
$104,263

At 14.4 times the state average, Valley Freeway draws drivers from neighborhoods averaging $104,263 in household income.

7Valley FreewayPierce County · Motorway · 78,653vehicles9,040trucks · 11.5%
Road class
Motorway
Congestion ratio
77.8%
Median trip time
38.4 min
Drivers’ median age
42.6 yrs
Drivers’ average income
$107,928

A main artery: Valley Freeway's busiest stretch carries 10.7 times the state average; trucks are 11.5% of it, above the state-wide 7.1%.

8I 405King County · Motorway · #2 by traffic154,534vehicles8,878trucks · 5.7%
9I 5Clark County · Motorway · 90,782vehicles8,756trucks · 9.6%
Road class
Motorway
Congestion ratio
62.3%
Median trip time
37.6 min
Drivers’ median age
46.0 yrs
Drivers’ average income
$99,380

I 5 is a trunk route for the state, carrying 12.4 times the state average on its busiest stretch; trucks are 9.6% of it, above the state-wide 7.1%.

10I 5Lewis County · Motorway · 59,985vehicles8,227trucks · 13.7%
Road class
Motorway
Congestion ratio
67.9%
Median trip time
51.5 min
Drivers’ median age
47.0 yrs
Drivers’ average income
$79,074

I 5 carries through traffic: the median trip using it lasts 51.5 minutes, against 33.2 for the state.

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

WashingtonDepartment 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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States near Washington

The same traffic breakdown for the states closest to Washington.

Need segment-level traffic data?

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

Counties in Washington

Traffic counts, truck share, congestion and driver demographics for each of the 39 counties TrafficZoom measures in Washington.