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Traffic heat map of Hawaii County, Hawaii: 716 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Mamalahoa Highway

Hawaii County, Hawaii Traffic Counts

How busy are the roads of Hawaii County, Hawaii? We measure 716 road miles, divided into 6,873 segments, with multi-sourced, cross-verified mobile and sensor data. Its roads are the quietest of any county in Hawaii, at 7,392 vehicles a day on average. The breakdown below covers volume, trucks, congestion and driver profiles for retailers, logistics planners and engineers.
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 Hawaii County, Hawaii

Traffic

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

vehicles per day7,392
Trucks

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

6.8%
Average travel time

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

36.4 min
Congestion ratio

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

22.1%
Drivers’ average age

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

50.7 yrs
Drivers’ average income

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

$84,637

Our data shows 7,392 vehicles per day on the average road in Hawaii County, Hawaii, and 4,687,208 vehicle-miles traveled per day (≈1.7 billion per year) across its 716 miles of monitored roads. Trucks are 6.8% of traffic, more than the 5.4% across Hawaii.

The quietest roads of any county in Hawaii

At 7,392 vehicles per day, the average monitored road in Hawaii carries 29% less traffic than the state average of 10,441, suggesting less demand on each road - lighter roads for freight, but less passing trade for roadside retail. Network-wide, Hawaii accounts for about 21% of Hawaii's statewide total of vehicle-miles. Hawaii stands out as having the lowest traffic volume in Hawaii - 7,392 vehicles per day.

At 36.4 minutes, the average travel time matches the state level closely. 67% of counties in Hawaii have a shorter average travel time than Hawaii's 36.4 minutes.

At 25% lower than the state level, the 22.1% 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 Hawaii County, Hawaii

Trafficvehicles per day15,020
Trucks6.1%
Average travel time35.9 min
Drivers’ average age51.0 yrs
Drivers’ average income$79,812

Only a small share of travel in Hawaii County, Hawaii happens on highways: 12% of vehicle-miles. The average highway carries 15,020 vehicles per day, 115% more than the average non-highway road in the same area, which carries 6,993 vehicles per day.

With 5% of the road miles (37 miles in 342 segments), highways punch above their length, carrying 566,724 vehicle-miles traveled per day (≈207 million per year).

The highest highway truck share of any county in Hawaii

The concentration of trucks on highways (6.1%) is 15% higher than the state average for similar road classifications. The highway traffic mix is typical for Hawaii: neither freight- nor commuter-dominated.

By share, Hawaii has the highest highway truck concentration in Hawaii, at 6.1%. By raw volume, Hawaii carries the lowest number of highway trucks in Hawaii - roughly 953 trucks per day.

non-highway traffic icon

Non-highway Traffic in Hawaii County, Hawaii

Trafficvehicles per day6,993
Trucks6.9%
Average travel time36.5 min
Congestion ratio22.1%
Drivers’ average age50.6 yrs
Drivers’ average income$85,728

Local roads carry the vast majority of travel in Hawaii County, Hawaii, 88% of all vehicle-miles. On the average non-highway road, that comes to 6,993 vehicles per day.

Their share of road miles is similar, 95% (680 miles in 6,531 segments), carrying 4,120,484 vehicle-miles traveled per day (≈1.5 billion per year). About 1 in 14 vehicles on non-highway roads is a truck (6.9%).

The lowest driver income of any county in Hawaii

Unusually, the concentration of trucks on non-highway roads is 13% higher than on highways.

At 22% lower than the state level, the non-highway congestion ratio of 22.1% signals easier movement on local roads.

Hawaii also has the lowest average driver income in Hawaii among trip origins - $84,637. Drivers here also skew toward the highest median age in Hawaii, at 51 years.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and PM peak 3:00 PM–6:00 PM, with volumes reaching approximately 124% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 17% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
Traffic is nearly flat through the year: even January–March, the busiest stretch, runs only +2% versus the annual average.
Lowest month:
July is the quietest month, with volumes -3% versus the annual average - an unusual summer low, when most places are at their busiest.

Data Finding: Hourly & Seasonal Patterns

In Hawaii County, Hawaii, traffic has a sharp commute peak, with the busiest hour carrying about 9% of the day's traffic, and traffic stays steady through the year (+2% in high season).

Hawaii County vs. Hawaii Traffic Comparison

The average daily traffic per road sets Hawaii County apart: 29% below the Hawaii average. Its truck share, by contrast, is 27% above.

MetricHawaii CountyHawaii averageDifference
Traffic7,39210,441-29.2%
Truck % (Total Traffic)6.8%5.4%+27.2%
Truck % (Highway)6.1%5.4%+14.6%
Avg. Travel Time36.4 min36.4 min+0.2%

How Hawaii County compares

Hawaii County is the least congested of its nearby counties

Compared with its 4 closest neighbours, Hawaii County is 28.4% less congested; it has the quietest roads of the five. Less traffic and more room for it - the roads here run both quieter and freer than the areas around them.

Hawaii County and the 4 nearest county-level areas by centroid distance, with the Hawaii average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Hawaii County7,3926.8%4,687,20836.4 min22.1%
Maui County, Hawaii9,0665.0%2,664,05937.8 min31.1%
Honolulu County, Hawaii12,1485.0%13,442,04136.1 min32.3%
Kauai County, Hawaii8,1975.0%1,334,09936.4 min31.9%
Marin County, California9,8226.8%5,877,92831.2 min27.8%
Hawaii average10,4415.4%N/A36.4 min29.5%

Hawaii County ranked within Hawaii

Hawaii County posts the highest average driver age of any county-level area in Hawaii.

Hawaii County ranked among 4 county-level areas in Hawaii (1 = highest).
MeasureHawaii CountyHawaii rank
Traffic volume (AADT)7,392#4 of 4
Average travel time36.4 min#2 of 4
Average driver income$84,637#4 of 4
Average driver age50.7 yrs#1 of 4

Hawaii County ranks #1 of 4 on average driver age but #4 of 4 on average driver income. The driver population here skews older and lower-income than most of Hawaii.

Busiest roads in Hawaii County, Hawaii

The three busiest roads in Hawaii County average 32,797 vehicles a day, 4.4 times the county average of 7,392 across all its monitored roads.

Mamalahoa Highway leads with 35,407 vehicles a day, 2,245 of them trucks (6.3%). It also carries the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Mamalahoa HighwayTrunk road · 35,407vehicles2,245trucks · 6.3%
Road class
Trunk road
Median trip time
35.5 min
Drivers’ median age
50.6 yrs
Drivers’ average income
$72,943

Mamalahoa Highway carries 4.8 times the county average on its busiest stretch, where the median trip lasts 35.5 minutes.

2Kanoelehua AvenueTrunk road · 32,284vehicles1,395trucks · 4.3%
Road class
Trunk road
Median trip time
36.2 min
Drivers’ median age
50.7 yrs
Drivers’ average income
$73,431

At 4.4 times the county average, Kanoelehua Avenue draws drivers from neighborhoods averaging $73,431 in household income.

3Queen Ka'ahumanu HighwayTrunk road · 30,700vehicles2,030trucks · 6.6%
Road class
Trunk road
Median trip time
36.0 min
Drivers’ median age
52.0 yrs
Drivers’ average income
$93,274

The busiest stretch of Queen Ka'ahumanu Highway carries 4.2 times the county average; trucks are 6.6% of it, in line with the county-wide 6.8%.

4Keaʻau-Pāhoa Bypass RoadTrunk road · 26,279vehicles1,775trucks · 6.8%
Road class
Trunk road
Median trip time
35.6 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$70,815

On its busiest stretch, Keaʻau-Pāhoa Bypass Road carries 3.6 times the county average; trucks are 6.8% of it, in line with the county-wide 6.8%.

5Kamehameha AvenuePrimary road · 25,056vehicles1,157trucks · 4.6%
Road class
Primary road
Congestion ratio
34.5%
Median trip time
36.7 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$70,994

Kamehameha Avenue is one of the more congested roads here: trips take 34% longer than at free-flow speed, against 22% county-wide.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Mamalahoa HighwayTrunk road · #1 by traffic35,407vehicles2,245trucks · 6.3%
2Queen Ka'ahumanu HighwayTrunk road · #3 by traffic30,700vehicles2,030trucks · 6.6%
3Queen Kaahumanu HighwayTrunk road · 17,501vehicles1,907trucks · 10.9%
Road class
Trunk road
Median trip time
40.8 min
Drivers’ median age
50.8 yrs
Drivers’ average income
$102,106

Queen Kaahumanu Highway peaks at 17,501 vehicles a day, 2.4 times the county average; trucks are 10.9% of it, above the county-wide 6.8%.

4Keaʻau-Pāhoa Bypass RoadTrunk road · #4 by traffic26,279vehicles1,775trucks · 6.8%
5Volcano RoadTrunk road · 20,457vehicles1,568trucks · 7.7%
Road class
Trunk road
Median trip time
34.8 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$71,636

Volcano Road carries 2.8 times the county average at its busiest, 1,568 of them trucks (7.7%, above the county-wide 6.8%).

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

HawaiiDepartment 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 Hawaii County

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

Need segment-level traffic data?

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