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Traffic heat map of Somerset County, New Jersey: 688 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Middlesex Freeway

Somerset County, New Jersey Traffic Counts

How busy are the roads of Somerset County, New Jersey? We measure 688 road miles, divided into 20,608 segments, with multi-sourced, cross-verified mobile and sensor data. Its drivers come from the highest-income neighborhoods of any county in New Jersey, averaging $159,027. 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 Somerset County, New Jersey

Traffic

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

vehicles per day7,854
Trucks

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

7.8%
Average travel time

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

33.0 min
Congestion ratio

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

23.1%
Drivers’ average age

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

48.0 yrs
Drivers’ average income

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

$159,027

The average monitored road in Somerset County, New Jersey carries 7,854 vehicles per day. Across its 688 miles of monitored roads, that adds up to 7,289,293 vehicle-miles traveled per day (≈2.7 billion per year). About 1 in 13 vehicles is a truck, in line with New Jersey (7.9%).

Congestion 14% below the New Jersey average

At 7,854 vehicles per day, the average road in Somerset carries somewhat less traffic than the state average of 8,886 (12% less) - a factor worth weighing in site selection and logistics planning. In total volume terms, its road network carries about 4.7% of New Jersey's statewide total of vehicle-miles. By volume, Somerset's 7,854 vehicles per day outpaces 50% of counties in New Jersey.

Journey times here (33.0 minutes on average) closely track the state level. On travel time, Somerset runs shorter than 55% of counties in New Jersey.

Congestion is somewhat lower than the state level, at a ratio of 23.1% (14% lower) - relevant for traffic control and delivery planning.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Somerset County, New Jersey

Trafficvehicles per day23,185
Trucks10.5%
Average travel time38.2 min
Congestion ratio50.3%
Drivers’ average age48.2 yrs
Drivers’ average income$151,296

Highways carry more than half of all travel in Somerset County, New Jersey (57% of vehicle-miles). The average highway carries 23,185 vehicles per day, 253% more than the average non-highway road in the same area, which carries 6,577 vehicles per day.

With 23% of the road miles (158 miles in 1,584 segments), highways punch above their length, carrying 4,186,892 vehicle-miles traveled per day (≈1.5 billion per year).

By highway travel volume, Somerset outranks 55% of counties in New Jersey.

More highway trucks than 65% of counties in New Jersey

Highway truck concentration here (10.5%) closely tracks the state average for similar road classifications. The highway traffic mix is typical for New Jersey: neither freight- nor commuter-dominated.

Somerset's highway truck share (10.5%) is higher than 55% of counties in New Jersey. 65% of counties in New Jersey see fewer highway trucks per day than Somerset's roughly 2,432.

non-highway traffic icon

Non-highway Traffic in Somerset County, New Jersey

Trafficvehicles per day6,577
Trucks4.2%
Average travel time32.6 min
Congestion ratio20.9%
Drivers’ average age47.7 yrs
Drivers’ average income$165,787

Local roads carry a significant share of travel in Somerset County, New Jersey: 43% of all vehicle-miles. A typical local road sees 6,577 vehicles per day.

Spread over 530 miles and 19,024 segments, 77% of the road network, local roads carry a lighter load per mile: 3,102,401 vehicle-miles traveled per day (≈1.1 billion per year). Trucks make up 4.2% of non-highway traffic, about 1 in 24 vehicles.

The highest driver income of any county in New Jersey

The concentration of trucks on non-highway roads is 60% lower than on highways.

Non-highway congestion (20.9%) runs slightly lower than the state level (14% lower).

Trips here originate from the highest average driver income in New Jersey, at $159,027. Somerset's median driver age is lower than 55% of counties in New Jersey.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–9:00 AM and PM peak 4:00 PM–7:00 PM, with volumes reaching approximately 75% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 14% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
Traffic is nearly flat through the year: even May–July, the busiest stretch, runs only +3% versus the annual average.
Lowest month:
January is the quietest month, with volumes -9% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Somerset County, New Jersey, the peak hour concentrates about 7% of the day's traffic, and traffic stays steady through the year (+3% in high season).

Somerset County vs. New Jersey Traffic Comparison

Somerset County stays close to the New Jersey average; the largest gap is its average daily traffic per road, 12% below.

MetricSomerset CountyNew Jersey averageDifference
Traffic7,8548,886-11.6%
Truck % (Total Traffic)7.8%7.9%-1.6%
Truck % (Highway)10.5%10.2%+2.7%
Avg. Travel Time33.0 min33.4 min-1.0%

How Somerset County compares

Somerset County against nearby counties

Nothing in this table sets Somerset County sharply apart from the 4 areas nearest to it, though it has the third busiest roads of the five.

Somerset County and the 4 nearest county-level areas by centroid distance, with the New Jersey average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Somerset County7,8547.8%7,289,29333.0 min23.1%
Middlesex County, New Jersey11,9778.9%16,312,25333.0 min33.5%
Hunterdon County, New Jersey5,23011.0%3,591,63435.4 min14.0%
Mercer County, New Jersey7,8499.6%5,871,43535.4 min23.1%
Union County, New Jersey15,3658.3%8,438,33834.3 min39.7%
New Jersey average8,8867.9%N/A33.4 min27.0%

Somerset County ranked within New Jersey

Somerset County posts the highest average driver income of any county-level area in New Jersey.

Somerset County ranked among 21 county-level areas in New Jersey (1 = highest).
MeasureSomerset CountyNew Jersey rank
Traffic volume (AADT)7,854#11 of 21
Highway vehicle-miles per day4,186,892#10 of 21
Truck share on highways10.5%#10 of 21
Highway trucks per day2,432#8 of 21
Average travel time33.0 min#12 of 21
Average driver income$159,027#1 of 21
Average driver age48.0 yrs#12 of 21

Busiest roads in Somerset County, New Jersey

Traffic concentrates on a few corridors: the three busiest roads average 63,099 vehicles a day, against 7,854 on the average road in Somerset County.

Middlesex Freeway leads with 69,036 vehicles a day, 8,102 of them trucks (11.7%). Phillipsburg-Newark Expressway carries the most trucks, 9,392 a day (15.2% of its traffic), although it ranks #2 for all traffic.

Freight stands out on Phillipsburg-Newark Expressway: trucks are 15.2% of the traffic there, against 7.8% county-wide.

Phillipsburg-Newark Expressway carries longer journeys than most roads here, with a median trip of 49.9 minutes against 33.0 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Middlesex FreewayMotorway · 69,036vehicles8,102trucks · 11.7%
Road class
Motorway
Congestion ratio
56.0%
Median trip time
46.2 min
Drivers’ median age
47.8 yrs
Drivers’ average income
$154,998

Middlesex Freeway carries through traffic: the median trip using it lasts 46.2 minutes, against 33.0 for the county.

2Phillipsburg-Newark ExpresswayMotorway · 61,569vehicles9,392trucks · 15.2%
Road class
Motorway
Congestion ratio
38.4%
Median trip time
49.9 min
Drivers’ median age
49.9 yrs
Drivers’ average income
$161,067

A main artery: Phillipsburg-Newark Expressway's busiest stretch carries 7.8 times the county average; trucks are 15.2% of it, above the county-wide 7.8%.

3US 202Motorway · 58,693vehicles2,970trucks · 5.1%
Road class
Motorway
Congestion ratio
86.9%
Median trip time
40.1 min
Drivers’ median age
49.1 yrs
Drivers’ average income
$125,369

US 202 is one of the more congested roads here: trips take 87% longer than at free-flow speed, against 23% county-wide.

4US 22Trunk road · 38,218vehicles1,951trucks · 5.1%
Road class
Trunk road
Congestion ratio
49.4%
Median trip time
31.9 min
Drivers’ median age
47.7 yrs
Drivers’ average income
$142,917

US 22 carries 4.9 times the county average at its busiest, 1,951 of them trucks (5.1%, below the county-wide 7.8%).

5Easton AvenuePrimary road · 34,603vehicles1,500trucks · 4.3%
Road class
Primary road
Congestion ratio
56.3%
Median trip time
32.5 min
Drivers’ median age
42.8 yrs
Drivers’ average income
$121,659

Delays build on Easton Avenue: its congestion ratio of 56% over free-flow time is well above the county's 23%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Phillipsburg-Newark ExpresswayMotorway · #2 by traffic61,569vehicles9,392trucks · 15.2%
2Middlesex FreewayMotorway · #1 by traffic69,036vehicles8,102trucks · 11.7%
3US 202Motorway · #3 by traffic58,693vehicles2,970trucks · 5.1%
4US 22Trunk road · #4 by traffic38,218vehicles1,951trucks · 5.1%
5Easton AvenuePrimary road · #5 by traffic34,603vehicles1,500trucks · 4.3%
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

SomersetDepartment 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 Somerset County

The same traffic breakdown for the areas closest to Somerset County, New Jersey.

Need segment-level traffic data?

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