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Traffic heat map of Mercer County, West Virginia: 337 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Virginia Turnpike and I 77

Mercer County, West Virginia Traffic Counts

Our Mercer County, West Virginia traffic data covers 3,382 road segments over 337 road miles, with an average segment of just 526 ft. It is one of the top 5 counties in West Virginia for highway travel volume. 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 Mercer County, West Virginia

Traffic

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

vehicles per day7,690
Trucks

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

13.7%
Average travel time

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

34.2 min
Congestion ratio

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

22.3%
Drivers’ average age

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

50.3 yrs
Drivers’ average income

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

$52,965

The average monitored road in Mercer County, West Virginia carries 7,690 vehicles per day. Across its 337 miles of monitored roads, that adds up to 3,165,215 vehicle-miles traveled per day (≈1.2 billion per year). At 13.7%, the truck share runs above the 11.0% across West Virginia: about 1 in 7 vehicles.

Longer trips than 89% of counties in West Virginia

Mercer's average daily traffic volume of 7,690 vehicles per day is on par with the state average of 7,367. Network-wide, Mercer accounts for about 4.3% of West Virginia's statewide total of vehicle-miles. 81% of counties in West Virginia see less traffic than Mercer's 7,690 vehicles per day.

The average trip takes 34.2 minutes, 11% higher than the state level. On travel time, Mercer runs longer than 89% of counties in West Virginia.

At 22.3%, the congestion ratio matches the state level closely.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Mercer County, West Virginia

Trafficvehicles per day16,646
Trucks17.4%
Average travel time43.2 min
Congestion ratio39.9%
Drivers’ average age50.1 yrs
Drivers’ average income$55,524

Highways carry more than half of all travel in Mercer County, West Virginia (68% of vehicle-miles). The average highway carries 16,646 vehicles per day, 141% more than the average non-highway road in the same area, which carries 6,910 vehicles per day.

With 34% of the road miles (114 miles in 271 segments), highways punch above their length, carrying 2,146,821 vehicle-miles traveled per day (≈784 million per year).

No more than 4 other counties in West Virginia move more traffic on their highways.

More highway trucks than 91% of counties in West Virginia

The concentration of trucks on highways (17.4%) is 15% 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 80% of counties in West Virginia. By raw truck volume, Mercer carries more highway trucks than 91% of counties in West Virginia.

non-highway traffic icon

Non-highway Traffic in Mercer County, West Virginia

Trafficvehicles per day6,910
Trucks6.0%
Average travel time33.5 min
Congestion ratio20.8%
Drivers’ average age50.3 yrs
Drivers’ average income$50,741

Local roads carry a significant share of travel in Mercer County, West Virginia: 32% of all vehicle-miles. The average non-highway road carries 6,910 vehicles per day.

Local roads make up 66% of the monitored road miles (223 miles in 3,111 segments) but carry less than their share of travel: 1,018,394 vehicle-miles traveled per day (≈372 million per year). The truck share on non-highway roads is 6.0%.

Drivers from lower-income areas than 76% of counties in West Virginia

Non-highway roads carry a truck concentration that's 65% lower than the highway network.

At 20.8%, the non-highway congestion ratio matches the state level closely.

Trip origins here have lower average income than 76% of counties in West Virginia. 57% of counties in West Virginia have an older driver population than Mercer.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and a long afternoon plateau from 12:00 PM to 7:00 PM, with volumes reaching approximately 69% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 21% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
Traffic is nearly flat through the year: even August–October, the busiest stretch, runs only +4% versus the annual average.
Lowest month:
January is the quietest month, with volumes -11% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Mercer County, West Virginia, the peak hour concentrates about 7% of the day's traffic, and traffic stays steady through the year (+4% in high season).

Mercer County vs. West Virginia Traffic Comparison

Mercer County's biggest difference from the West Virginia average is its truck share, 25% above it. Its highway truck share is also 15% above.

MetricMercer CountyWest Virginia averageDifference
Traffic7,6907,367+4.4%
Truck % (Total Traffic)13.7%11.0%+24.5%
Truck % (Highway)17.4%15.1%+15.3%
Avg. Travel Time34.2 min30.8 min+11.3%

How Mercer County compares

Mercer County against nearby counties

Compared with its 4 closest neighbours, Mercer County is 69.8% more congested and carries 59.3% more traffic on a typical road; it has the second busiest roads of the five. It is where traffic concentrates in this corner of the map - the local bottleneck, with more vehicles per road AND less room to absorb them.

Mercer County and the 4 nearest county-level areas by centroid distance, with the West Virginia average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Mercer County7,69013.7%3,165,21534.2 min22.3%
Bland County, Virginia2,48421.6%847,02431.6 min8.7%
Summers County, West Virginia3,66113.0%693,43634.2 min11.0%
Giles County, Virginia3,73910.5%572,19929.3 min9.2%
Raleigh County, West Virginia9,42413.8%3,935,07533.3 min23.8%
West Virginia average7,36711.0%N/A30.8 min21.5%

Mercer County ranked within West Virginia

Mercer County sits in the top quarter of the West Virginia field on highway travel volume, at #4 of 47.

Mercer County ranked among 55 county-level areas in West Virginia (1 = highest); measures without data in every county rank a smaller field, down to 47.
MeasureMercer CountyWest Virginia rank
Traffic volume (AADT)7,690#11 of 55
Highway vehicle-miles per day2,146,821#4 of 47
Truck share on highways17.4%#10 of 47
Highway trucks per day2,891#5 of 47
Average travel time34.2 min#7 of 55
Average driver income$52,965#42 of 55
Average driver age50.3 yrs#32 of 55

Mercer County ranks #4 of 47 on highway travel volume but #42 of 55 on average driver income - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Mercer County, West Virginia

Traffic concentrates on a few corridors: the three busiest roads average 44,766 vehicles a day, against 7,690 on the average road in Mercer County.

Virginia Turnpike is the busiest road, at 54,205 vehicles a day, 11,389 of them trucks (21.0%). I 77 carries the most trucks, 11,916 a day (24.3% of its traffic), although it ranks #2 for all traffic.

Freight stands out on River Mountain Tunnel and I 77: trucks are 25.8% and 24.3% of the traffic there, against 13.7% county-wide.

Virginia Turnpike carries longer journeys than most roads here, with a median trip of 50.0 minutes against 34.2 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Virginia TurnpikeMotorway · 54,205vehicles11,389trucks · 21.0%
Road class
Motorway
Congestion ratio
57.6%
Median trip time
50.0 min
Drivers’ median age
49.7 yrs
Drivers’ average income
$58,795

A freight route: trucks are 21.0% of the traffic on Virginia Turnpike's busiest stretch, 1.5 times the county-wide 13.7%.

2I 77Motorway · 49,124vehicles11,916trucks · 24.3%
Road class
Motorway
Congestion ratio
61.8%
Median trip time
47.5 min
Drivers’ median age
49.6 yrs
Drivers’ average income
$57,514

I 77 is one of the more congested roads here: trips take 62% longer than at free-flow speed, against 22% county-wide.

3US 52Trunk road · 30,968vehicles2,185trucks · 7.0%
Road class
Trunk road
Congestion ratio
38.4%
Median trip time
34.1 min
Drivers’ median age
50.6 yrs
Drivers’ average income
$56,407

US 52 carries 4.0 times the county average at its busiest, 2,185 of them trucks (7.0%, below the county-wide 13.7%).

4US 460Trunk road · 28,359vehicles1,022trucks · 3.6%
Road class
Trunk road
Congestion ratio
34.9%
Median trip time
31.7 min
Drivers’ median age
49.5 yrs
Drivers’ average income
$57,141

US 460 carries 3.7 times the county average on its busiest stretch, where the median trip lasts 31.7 minutes.

5Stafford DriveSecondary road · 27,046vehicles1,032trucks · 3.8%
Road class
Secondary road
Congestion ratio
61.1%
Median trip time
33.8 min
Drivers’ median age
50.3 yrs
Drivers’ average income
$48,846

Delays build on Stafford Drive: its congestion ratio of 61% over free-flow time is well above the county's 22%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 77Motorway · #2 by traffic49,124vehicles11,916trucks · 24.3%
2Virginia TurnpikeMotorway · #1 by traffic54,205vehicles11,389trucks · 21.0%
3River Mountain TunnelMotorway · 13,885vehicles3,577trucks · 25.8%
Road class
Motorway
Median trip time
49.7 min
Drivers’ median age
50.8 yrs
Drivers’ average income
$57,433

River Mountain Tunnel carries through traffic: the median trip using it lasts 49.7 minutes, against 34.2 for the county.

4US 52Trunk road · #3 by traffic30,968vehicles2,185trucks · 7.0%
5Cumberland RoadTrunk road · 14,462vehicles1,501trucks · 10.4%
Road class
Trunk road
Congestion ratio
20.9%
Median trip time
39.2 min
Drivers’ median age
49.3 yrs
Drivers’ average income
$56,292

Cumberland Road carries 88% more than the county average on its busiest stretch, where the median trip lasts 39.2 minutes.

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, West Virginia.

Need segment-level traffic data?

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