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Traffic heat map of Mercer County, Pennsylvania: 687 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Connelly Boulevard and I 80

Mercer County, Pennsylvania Traffic Counts

TrafficZoom tracks traffic on 687 road miles in Mercer County, Pennsylvania, divided into 11,369 segments averaging 319 ft. Trips here are among the 3 longest of any county in Pennsylvania. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Mercer County, Pennsylvania

Traffic

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

vehicles per day3,674
Trucks

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

14.3%
Average travel time

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

42.5 min
Congestion ratio

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

12.3%
Drivers’ average age

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

52.5 yrs
Drivers’ average income

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

$65,765

A typical monitored road in Mercer County, Pennsylvania sees 3,674 vehicles per day, while its 687 miles of monitored roads together handle 2,697,606 vehicle-miles traveled per day (≈985 million per year). Trucks are 14.3% of traffic, more than the 10.6% across Pennsylvania.

Longer trips than 97% of counties in Pennsylvania

Mercer sees 35% lower average daily traffic volume than the state average (3,674 vehicles per day against 5,617), suggesting less demand on each road - less drive-by exposure for retail, but easier access for deliveries. Network-wide, Mercer accounts for about 1.2% of Pennsylvania's statewide total of vehicle-miles. Mercer carries more traffic than 53% of counties in Pennsylvania.

At 42.5 minutes, the average travel time is 23% higher than the state level. On travel time, Mercer runs longer than 97% of counties in Pennsylvania.

Congestion runs 26% lower than the state level, at a ratio of 12.3%, 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 Mercer County, Pennsylvania

Trafficvehicles per day10,584
Trucks20.2%
Average travel time51.4 min
Congestion ratio21.9%
Drivers’ average age52.9 yrs
Drivers’ average income$66,096

A little more than half of the driving in Mercer County, Pennsylvania happens on highways: 57% of all vehicle-miles. The average highway carries 10,584 vehicles per day, 233% more than the average non-highway road in the same area, which carries 3,175 vehicles per day.

Highways make up 22% of the monitored road miles (152 miles, 767 segments), so they carry more than their share: 1,547,115 vehicle-miles traveled per day (≈565 million per year).

By highway travel volume, Mercer outranks 62% of counties in Pennsylvania.

Freight-heavy highways

The concentration of trucks on highways (20.2%) is 28% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.

By truck concentration, highways here outrank 62% of counties in Pennsylvania. Mercer's highway truck count is higher than 59% of counties in Pennsylvania, at roughly 2,136 trucks per day.

non-highway traffic icon

Non-highway Traffic in Mercer County, Pennsylvania

Trafficvehicles per day3,175
Trucks6.4%
Average travel time41.9 min
Congestion ratio11.6%
Drivers’ average age52.2 yrs
Drivers’ average income$65,508

A significant share of driving in Mercer County, Pennsylvania, 43% of vehicle-miles, happens on local roads. A typical local road sees 3,175 vehicles per day.

Spread over 535 miles and 10,602 segments, 78% of the road network, local roads carry a lighter load per mile: 1,150,491 vehicle-miles traveled per day (≈420 million per year). Trucks make up 6.4% of non-highway traffic, about 1 in 16 vehicles.

Older drivers than 82% of counties in Pennsylvania

The concentration of trucks on non-highway roads is 68% lower than on highways.

The non-highway congestion ratio of 11.6% is 26% lower than the state level, suggesting more efficient local mobility than the state average.

Trip origins here have lower average income than 70% of counties in Pennsylvania. The driver population here skews older than 82% of counties in Pennsylvania.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Mercer County, Pennsylvania, the peak hour concentrates about 7% of the day's traffic.

Mercer County vs. Pennsylvania Traffic Comparison

Of the four measures, truck share differs most: Mercer County runs 35% above the Pennsylvania average. Its average daily traffic per road, by contrast, is 35% below.

MetricMercer CountyPennsylvania averageDifference
Traffic3,6745,617-34.6%
Truck % (Total Traffic)14.3%10.6%+34.6%
Truck % (Highway)20.2%15.8%+28.1%
Avg. Travel Time42.5 min34.6 min+22.8%

How Mercer County compares

Mercer County against nearby counties

Against the 4 nearest areas, Mercer County sees 21.4% longer typical trips; it has the second busiest roads of the five. Trips here run longer without running slower: distance, not congestion, is what drivers spend their time on.

Mercer 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
Mercer County3,67414.3%2,697,60642.5 min12.3%
Lawrence County, Pennsylvania3,53611.1%1,596,67231.7 min12.0%
Trumbull County, Ohio5,28912.3%4,042,32734.2 min13.4%
Crawford County, Pennsylvania2,63710.1%1,564,72131.1 min10.2%
Venango County, Pennsylvania3,02916.9%1,146,37743.0 min9.5%
Pennsylvania average5,61710.6%N/A34.6 min16.5%

Mercer County ranked within Pennsylvania

On average travel time, Mercer County is among the three highest county-level areas in Pennsylvania.

Mercer County ranked among 67 county-level areas in Pennsylvania (1 = highest); measures without data in every county rank a smaller field, down to 64.
MeasureMercer CountyPennsylvania rank
Traffic volume (AADT)3,674#32 of 67
Highway vehicle-miles per day1,547,115#25 of 64
Truck share on highways20.2%#25 of 64
Highway trucks per day2,136#27 of 64
Average travel time42.5 min#3 of 67
Average driver income$65,765#47 of 67
Average driver age52.5 yrs#13 of 67

Busiest roads in Mercer County, Pennsylvania

Traffic concentrates on a few corridors: the three busiest roads average 29,202 vehicles a day, against 3,674 on the average road in Mercer County.

Connelly Boulevard is the busiest road, at 46,119 vehicles a day, 2,444 of them trucks (5.3%). No other road comes close: I 80, in second place, carries 23,994. I 80 carries the most trucks, 7,298 a day (30.4% of its traffic), although it ranks #2 for all traffic.

Trucks make up 30.4% of traffic on I 80, against 14.3% across all roads in the county.

Connelly Boulevard carries longer journeys than most roads here, with a median trip of 71.1 minutes against 42.5 county-wide.

Connelly Boulevard is busy with cars rather than freight: only 5.3% of its traffic is trucks, against 14.3% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Connelly BoulevardTrunk road · 46,119vehicles2,444trucks · 5.3%
Road class
Trunk road
Congestion ratio
62.3%
Median trip time
71.1 min
Drivers’ median age
52.9 yrs
Drivers’ average income
$63,812

Delays build on Connelly Boulevard: its congestion ratio of 62% over free-flow time is well above the county's 12%.

2I 80Motorway · 23,994vehicles7,298trucks · 30.4%
Road class
Motorway
Congestion ratio
26.6%
Median trip time
48.1 min
Drivers’ median age
51.9 yrs
Drivers’ average income
$63,773

I 80 is a trunk route for the county, carrying 6.5 times the county average on its busiest stretch; trucks are 30.4% of it, above the county-wide 14.3%.

3I 79Motorway · 17,494vehicles2,796trucks · 16.0%
Road class
Motorway
Congestion ratio
17.6%
Median trip time
63.1 min
Drivers’ median age
51.6 yrs
Drivers’ average income
$73,730

Drivers on I 79 are on long journeys, a median 63.1 minutes against 42.5 county-wide: a through route more than a local street.

4Main StreetSecondary road · 16,852vehicles768trucks · 4.5%
Road class
Secondary road
Congestion ratio
48.2%
Median trip time
38.8 min
Drivers’ median age
54.2 yrs
Drivers’ average income
$58,627

Travel on Main Street's busiest stretch runs 48% over free-flow time, against 12% across the county, so expect slower peak hours.

5Hermitage RoadTrunk road · 14,725vehicles703trucks · 4.8%
Road class
Trunk road
Congestion ratio
20.1%
Median trip time
33.3 min
Drivers’ median age
52.8 yrs
Drivers’ average income
$72,331

The busiest stretch of Hermitage Road carries 4.0 times the county average; trucks are 4.8% of it, below the county-wide 14.3%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 80Motorway · #2 by traffic23,994vehicles7,298trucks · 30.4%
2I 79Motorway · #3 by traffic17,494vehicles2,796trucks · 16.0%
3Connelly BoulevardTrunk road · #1 by traffic46,119vehicles2,444trucks · 5.3%
4Beaver Valley ExpresswayMotorway · 14,279vehicles1,414trucks · 9.9%
Road class
Motorway
Congestion ratio
18.3%
Median trip time
38.2 min
Drivers’ median age
53.0 yrs
Drivers’ average income
$68,386

On its busiest stretch, Beaver Valley Expressway carries 3.9 times the county average; trucks are 9.9% of it, below the county-wide 14.3%.

5Main StreetSecondary road · #4 by traffic16,852vehicles768trucks · 4.5%
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

MercerDepartment 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 Mercer County

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

Need segment-level traffic data?

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