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Traffic heat map of Gem County, Idaho: 121 miles of roads shaded from blue (light) to red (heavy traffic), busiest on ID 16 and Washington Avenue

Gem County, Idaho Traffic Counts

Our Gem County, Idaho traffic data covers 2,678 road segments over 121 road miles, with an average segment of just 238 ft. Its busiest road, ID 16, carries 17,483 vehicles a day, 5.4 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 Gem County, Idaho

Traffic

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

vehicles per day3,228
Trucks

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

5.8%
Average travel time

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

29.7 min
Congestion ratio

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

15.7%
Drivers’ average age

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

50.5 yrs
Drivers’ average income

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

$75,418

The average monitored road in Gem County, Idaho carries 3,228 vehicles per day. Across its 121 miles of monitored roads, that adds up to 370,681 vehicle-miles traveled per day (≈135 million per year). About 1 in 17 vehicles is a truck, fewer than the 1 in 10 across Idaho.

Shorter trips than 86% of counties in Idaho

At 3,228 vehicles per day, the average monitored road in Gem carries 44% less traffic than the state average of 5,734, suggesting less demand on each road - less drive-by exposure for retail, but easier access for deliveries. Across the whole network, that travel is about 0.8% of Idaho's statewide total. By volume, Gem's 3,228 vehicles per day outpaces 58% of counties in Idaho.

At 29.7 minutes, the average travel time is 12% lower than the state level. Its average travel time of 29.7 minutes is shorter than 86% of counties in Idaho.

At 15.7%, the congestion ratio matches the state level closely.

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–6:00 PM, with volumes reaching approximately 86% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 7% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +19% versus the annual average.
Lowest month:
January is the quietest month, with volumes -23% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Gem County, Idaho, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +19% in high season.

Gem County vs. Idaho Traffic Comparison

Of the four measures, average daily traffic per road differs most: Gem County runs 44% below the Idaho average. Its truck share is also 40% below.

MetricGem CountyIdaho averageDifference
Traffic3,2285,734-43.7%
Truck % (Total Traffic)5.8%9.7%-40.0%
Avg. Travel Time29.7 min33.8 min-12.3%

How Gem County compares

Gem County is more congested than any nearby county

Against the 4 nearest areas, Gem County is 106.0% more congested and sees 23.4% shorter typical trips; it has the fourth busiest roads of the five. Its roads run tighter than the areas around it on the same traffic - what differs here is the capacity, not the demand.

Gem County and the 4 nearest county-level areas by centroid distance, with the Idaho average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Gem County3,2285.8%370,68129.7 min15.7%
Boise County, Idaho4,8339.4%266,40658.1 min3.8%
Washington County, Idaho1,96410.2%194,39938.5 min7.5%
Payette County, Idaho3,58813.5%781,12135.0 min9.4%
Valley County, Idaho3,7807.5%421,43823.3 min9.7%
Idaho average5,7349.7%N/A33.8 min16.0%

Gem County ranked within Idaho

Average travel time places Gem County #38 of 44 in Idaho - the bottom quarter of the state.

Gem County ranked among 44 county-level areas in Idaho (1 = highest).
MeasureGem CountyIdaho rank
Traffic volume (AADT)3,228#19 of 44
Average travel time29.7 min#38 of 44
Average driver income$75,418#11 of 44
Average driver age50.5 yrs#15 of 44

Gem County ranks #11 of 44 on average driver income but #38 of 44 on average travel time - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Gem County, Idaho

The three busiest roads in Gem County average 15,146 vehicles a day, 4.7 times the county average of 3,228 across all its monitored roads.

ID 16 is the busiest road, at 17,483 vehicles a day, 841 of them trucks (4.8%). Emmett Highway carries the most trucks, 1,453 a day (11.5% of its traffic), although it ranks #3 for all traffic.

Trucks make up 11.5% of traffic on Emmett Highway, against 5.8% across all roads in the county.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1ID 16Primary road · 17,483vehicles841trucks · 4.8%
Road class
Primary road
Congestion ratio
39.4%
Median trip time
29.6 min
Drivers’ median age
48.9 yrs
Drivers’ average income
$78,699

Delays build on ID 16: its congestion ratio of 39% over free-flow time is well above the county's 16%.

2Washington AvenuePrimary road · 15,296vehicles587trucks · 3.8%
Road class
Primary road
Congestion ratio
49.8%
Median trip time
28.7 min
Drivers’ median age
51.5 yrs
Drivers’ average income
$73,000

Travel on Washington Avenue's busiest stretch runs 50% over free-flow time, against 16% across the county, so expect slower peak hours.

3Emmett HighwayPrimary road · 12,660vehicles1,453trucks · 11.5%
Road class
Primary road
Congestion ratio
28.8%
Median trip time
37.4 min
Drivers’ median age
49.3 yrs
Drivers’ average income
$81,476

At 3.9 times the county average, Emmett Highway draws drivers from neighborhoods averaging $81,476 in household income.

4Sub Station RoadSecondary road · 11,471vehicles435trucks · 3.8%
Road class
Secondary road
Median trip time
28.7 min
Drivers’ median age
50.1 yrs
Drivers’ average income
$78,188

The busiest stretch of Sub Station Road carries 3.6 times the county average; trucks are 3.8% of it, below the county-wide 5.8%.

5ID 52Secondary road · 6,944vehicles354trucks · 5.1%
Road class
Secondary road
Median trip time
31.1 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$74,623

On its busiest stretch, ID 52 carries 2.2 times the county average; trucks are 5.1% of it, below the county-wide 5.8%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Emmett HighwayPrimary road · #3 by traffic12,660vehicles1,453trucks · 11.5%
2ID 16Primary road · #1 by traffic17,483vehicles841trucks · 4.8%
3Washington AvenuePrimary road · #2 by traffic15,296vehicles587trucks · 3.8%
4Sub Station RoadSecondary road · #4 by traffic11,471vehicles435trucks · 3.8%
5ID 52Secondary road · #5 by traffic6,944vehicles354trucks · 5.1%
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

GemDepartment 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 Gem County

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

Need segment-level traffic data?

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