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Traffic heat map of Union County, Pennsylvania: 292 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Westbranch Highway and Derr Drive

Union County, Pennsylvania Traffic Counts

Our Union County, Pennsylvania traffic data covers 3,234 road segments over 292 road miles, with an average segment of just 476 ft. About 1 in 6 vehicles here is a truck, against 1 in 9 across Pennsylvania. 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 Union County, Pennsylvania

Traffic

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

vehicles per day3,757
Trucks

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

17.0%
Average travel time

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

34.4 min
Congestion ratio

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

11.5%
Drivers’ average age

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

49.8 yrs
Drivers’ average income

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

$71,658

Our data shows 3,757 vehicles per day on the average road in Union County, Pennsylvania, and 1,084,777 vehicle-miles traveled per day (≈396 million per year) across its 292 miles of monitored roads. About 1 in 6 vehicles is a truck, well above the 10.6% across Pennsylvania - a freight-heavy mix.

Longer trips than 67% of counties in Pennsylvania

Union sees 33% lower average daily traffic volume than the state average (3,757 vehicles per day against 5,617), suggesting less demand on each road - less drive-by exposure for retail, but easier access for deliveries. In total volume terms, its road network carries about 0.5% of Pennsylvania's statewide total of vehicle-miles. Union carries more traffic than 56% of counties in Pennsylvania.

Journey times here (34.4 minutes on average) closely track the state level. 67% of counties in Pennsylvania have a shorter average travel time than Union's 34.4 minutes.

At 31% lower than the state level, the 11.5% congestion ratio signals 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 Union County, Pennsylvania

Trafficvehicles per day10,487
Trucks25.0%
Average travel time43.7 min
Congestion ratio22.9%
Drivers’ average age48.9 yrs
Drivers’ average income$72,192

A little more than half of the driving in Union County, Pennsylvania happens on highways: 58% of all vehicle-miles. The average highway carries 10,487 vehicles per day, 285% more than the average non-highway road in the same area, which carries 2,722 vehicles per day.

Highways make up 23% of the monitored road miles (66 miles, 431 segments), so they carry more than their share: 628,196 vehicle-miles traveled per day (≈229 million per year).

Higher highway truck share than 84% of counties in Pennsylvania

The concentration of trucks on highways (25.0%) is 59% higher than the state average for similar road classifications. That marks Union as a major freight corridor, where highway access is what logistics operators compete on.

By truck concentration, highways here outrank 84% of counties in Pennsylvania. 70% of counties in Pennsylvania see fewer highway trucks per day than Union's roughly 2,623.

non-highway traffic icon

Non-highway Traffic in Union County, Pennsylvania

Trafficvehicles per day2,722
Trucks6.0%
Average travel time33.0 min
Congestion ratio9.7%
Drivers’ average age51.4 yrs
Drivers’ average income$71,225

Local roads carry a significant share of travel in Union County, Pennsylvania: 42% of all vehicle-miles. The average non-highway road carries 2,722 vehicles per day.

Spread over 226 miles and 2,803 segments, 77% of the road network, local roads carry a lighter load per mile: 456,582 vehicle-miles traveled per day (≈167 million per year). The truck share on non-highway roads is 6.0%.

Local congestion 38% below the Pennsylvania average

Non-highway roads carry a truck concentration that's 76% lower than the highway network.

Non-highway congestion (9.7%) runs 38% lower than the state average, pointing to smoother local traffic flow.

Trip origins here have higher average income than 55% of counties in Pennsylvania. The driver population here skews younger than 55% of counties in Pennsylvania.

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 64% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 16% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +7% versus the annual average.
Lowest month:
January is the quietest month, with volumes -13% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Union County, Pennsylvania, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +7% in high season.

Union County vs. Pennsylvania Traffic Comparison

Of the four measures, truck share differs most: Union County runs 60% above the Pennsylvania average. Its highway truck share is also 59% above.

MetricUnion CountyPennsylvania averageDifference
Traffic3,7575,617-33.1%
Truck % (Total Traffic)17.0%10.6%+59.7%
Truck % (Highway)25.0%15.8%+58.8%
Avg. Travel Time34.4 min34.6 min-0.6%

How Union County compares

Union County against nearby counties

Nothing in this table sets Union County sharply apart from the 4 areas nearest to it, though it has the third busiest roads of the five. Traffic volume here matches the areas around it, but more of that traffic is trucks - a difference in what routes through, not in how much.

Union County and the 4 nearest county-level areas by centroid distance, with the Pennsylvania average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Union County3,75717.0%1,084,77734.4 min11.5%
Snyder County, Pennsylvania3,3439.7%835,79032.2 min11.4%
Northumberland County, Pennsylvania3,79711.2%1,772,96733.8 min12.3%
Montour County, Pennsylvania3,70018.5%648,03235.0 min16.8%
Lycoming County, Pennsylvania3,94410.2%2,259,71233.6 min13.7%
Pennsylvania average5,61710.6%N/A34.6 min16.5%

Union County ranked within Pennsylvania

Truck share on highways places Union County #11 of 64 in Pennsylvania - the top quarter of the state.

Union County ranked among 67 county-level areas in Pennsylvania (1 = highest); measures without data in every county rank a smaller field, down to 64.
MeasureUnion CountyPennsylvania rank
Traffic volume (AADT)3,757#30 of 67
Highway vehicle-miles per day628,196#44 of 64
Truck share on highways25.0%#11 of 64
Highway trucks per day2,623#20 of 64
Average travel time34.4 min#23 of 67
Average driver income$71,658#31 of 67
Average driver age49.8 yrs#37 of 67

Busiest roads in Union County, Pennsylvania

On their busiest stretches, the three busiest roads in Union County carry 21,053 vehicles a day on average, 5.6 times the typical road in the county (3,757).

Westbranch Highway is the busiest road, at 23,973 vehicles a day, 1,615 of them trucks (6.7%). I 80 carries the most trucks, 7,696 a day (40.0% of its traffic), although it ranks #3 for all traffic.

Trucks make up 40.0% of traffic on I 80, against 17.0% across all roads in the county.

Trips using I 80 are long: a median of 62.3 minutes against 34.4 county-wide, the mark of a through route.

Derr Drive is busy with cars rather than freight: only 5.0% of its traffic is trucks, against 17.0% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Westbranch HighwayTrunk road · 23,973vehicles1,615trucks · 6.7%
Road class
Trunk road
Congestion ratio
26.0%
Median trip time
39.7 min
Drivers’ median age
48.9 yrs
Drivers’ average income
$68,056

A main artery: Westbranch Highway's busiest stretch carries 6.4 times the county average; trucks are 6.7% of it, below the county-wide 17.0%.

2Derr DriveTrunk road · 19,965vehicles988trucks · 5.0%
Road class
Trunk road
Congestion ratio
26.5%
Median trip time
41.5 min
Drivers’ median age
48.9 yrs
Drivers’ average income
$75,004

Travel on Derr Drive's busiest stretch runs 27% over free-flow time, against 11% across the county, so expect slower peak hours.

3I 80Motorway · 19,221vehicles7,696trucks · 40.0%
Road class
Motorway
Congestion ratio
22.0%
Median trip time
62.3 min
Drivers’ median age
46.9 yrs
Drivers’ average income
$73,229

I 80 is a trunk route for the county, carrying 5.1 times the county average on its busiest stretch; trucks are 40.0% of it, above the county-wide 17.0%.

4Susquehanna TrailSecondary road · 14,286vehicles821trucks · 5.7%
Road class
Secondary road
Congestion ratio
18.8%
Median trip time
37.2 min
Drivers’ median age
52.7 yrs
Drivers’ average income
$68,648

Susquehanna Trail carries 3.8 times the county average on its busiest stretch, where the median trip lasts 37.2 minutes.

5US 15Trunk road · 12,362vehicles1,409trucks · 11.4%
Road class
Trunk road
Congestion ratio
28.7%
Median trip time
41.7 min
Drivers’ median age
48.0 yrs
Drivers’ average income
$65,483

US 15 is one of the more congested roads here: trips take 29% longer than at free-flow speed, against 11% county-wide.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 80Motorway · #3 by traffic19,221vehicles7,696trucks · 40.0%
2Westbranch HighwayTrunk road · #1 by traffic23,973vehicles1,615trucks · 6.7%
3US 15Trunk road · #5 by traffic12,362vehicles1,409trucks · 11.4%
4Derr DriveTrunk road · #2 by traffic19,965vehicles988trucks · 5.0%
5Susquehanna TrailSecondary road · #4 by traffic14,286vehicles821trucks · 5.7%
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

UnionDepartment 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 Union County

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

Need segment-level traffic data?

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