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Traffic heat map of Montgomery County, Maryland: 1,377 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Capital Beltway and I 270 Spur

Montgomery County, Maryland Traffic Counts

TrafficZoom tracks traffic on 1,377 road miles in Montgomery County, Maryland, divided into 37,230 segments averaging 195 ft. It ranks among the top 5 counties in Maryland for average daily traffic. 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 Montgomery County, Maryland

Traffic

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

vehicles per day8,704
Trucks

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

5.7%
Average travel time

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

35.5 min
Congestion ratio

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

21.0%
Drivers’ average age

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

45.1 yrs
Drivers’ average income

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

$151,219

The average monitored road in Montgomery County, Maryland carries 8,704 vehicles per day. Across its 1,377 miles of monitored roads, that adds up to 17,486,100 vehicle-miles traveled per day (≈6.4 billion per year). About 1 in 18 vehicles is a truck, fewer than the 1 in 13 across Maryland.

Longer trips than 87% of counties in Maryland

Montgomery's average daily traffic volume is 13% higher than the state average - 8,704 vehicles per day against 7,693 - a factor worth weighing in site selection and logistics planning. Network-wide, Montgomery accounts for about 13% of Maryland's statewide total of vehicle-miles. 83% of counties in Maryland see less traffic than Montgomery's 8,704 vehicles per day.

At 35.5 minutes, the average travel time matches the state level closely. Its average travel time of 35.5 minutes is longer than 87% of counties in Maryland.

At 21.0%, the congestion ratio matches the state level closely.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Montgomery County, Maryland

Trafficvehicles per day32,764
Trucks7.5%
Average travel time41.4 min
Congestion ratio50.2%
Drivers’ average age44.6 yrs
Drivers’ average income$146,039

A significant share of driving in Montgomery County, Maryland, 44% of vehicle-miles, happens on highways. The average highway carries 32,764 vehicles per day, 319% more than the average non-highway road in the same area, which carries 7,819 vehicles per day.

Yet highways are only 13% of the road network, 180 miles in 1,321 segments, so each mile of them is 3.4 times as busy as the average road mile.

By highway travel volume, that ranks Montgomery in the top 5 counties in Maryland.

Lower highway truck share than 87% of counties in Maryland

Highway truck concentration here runs 23% lower than the state average, at 7.5%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 87% of counties in Maryland. By raw truck volume, Montgomery carries more highway trucks than 74% of counties in Maryland.

non-highway traffic icon

Non-highway Traffic in Montgomery County, Maryland

Trafficvehicles per day7,819
Trucks4.2%
Average travel time35.3 min
Congestion ratio19.9%
Drivers’ average age45.5 yrs
Drivers’ average income$153,789

A little more than half of the driving in Montgomery County, Maryland happens on local roads: 56% of all vehicle-miles. The average non-highway road carries 7,819 vehicles per day.

Spread over 1,197 miles and 35,909 segments, 87% of the road network, local roads carry a lighter load per mile: 9,712,375 vehicle-miles traveled per day (≈3.5 billion per year). The truck share on non-highway roads is 4.2%.

Drivers from higher-income areas than 96% of counties in Maryland

The concentration of trucks on non-highway roads is 45% lower than on highways.

Non-highway congestion here (19.9%) closely tracks the state average.

Montgomery's average driver income is higher than 96% of counties in Maryland. 85% of counties in Maryland have an older driver population than Montgomery.

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 66% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 6% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
Traffic is nearly flat through the year: even June–August, the busiest stretch, runs only +3% versus the annual average.
Lowest month:
January is the quietest month, with volumes -7% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

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

Montgomery County vs. Maryland Traffic Comparison

Of the four measures, truck share differs most: Montgomery County runs 24% below the Maryland average. Its highway truck share is also 23% below.

MetricMontgomery CountyMaryland averageDifference
Traffic8,7047,693+13.1%
Truck % (Total Traffic)5.7%7.5%-24.2%
Truck % (Highway)7.5%9.8%-22.6%
Avg. Travel Time35.5 min34.0 min+4.4%

How Montgomery County compares

Montgomery County moves more traffic than any nearby county or city

Compared with its 4 closest neighbours, Montgomery County moves 5.7 times the total daily travel; it has the third busiest roads of the five. It is bigger rather than busier: the extra travel comes from carrying more road, not from heavier roads.

Montgomery County and the 4 nearest county-level areas by centroid distance, with the Maryland average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Montgomery County8,7045.7%17,486,10035.5 min21.0%
Falls Church City, Virginia10,4346.5%129,96534.1 min31.3%
Howard County, Maryland8,0787.3%9,629,64031.5 min18.7%
Arlington County, Virginia7,7436.3%2,258,17134.9 min16.4%
Fairfax City, Virginia9,6616.6%300,90532.2 min13.1%
Maryland average7,6937.5%N/A34.0 min20.5%

Montgomery County ranked within Maryland

On average driver income, Montgomery County is among the three highest county-level areas in Maryland.

Montgomery County ranked among 24 county-level areas in Maryland (1 = highest).
MeasureMontgomery CountyMaryland rank
Traffic volume (AADT)8,704#5 of 24
Highway vehicle-miles per day7,773,725#4 of 24
Truck share on highways7.5%#21 of 24
Highway trucks per day2,474#7 of 24
Average travel time35.5 min#4 of 24
Average driver income$151,219#2 of 24
Average driver age45.1 yrs#20 of 24

The two ends of this table sit far apart: #2 of 24 on average driver income, against #21 of 24 on truck share on highways.

Busiest roads in Montgomery County, Maryland

On their busiest stretches, the three busiest roads in Montgomery County carry 121,545 vehicles a day on average, 14.0 times the typical road in the county (8,704).

Capital Beltway is the busiest road, at 172,340 vehicles a day, 13,368 of them trucks (7.8%). That is 57% more than the next road, I 270 Spur (109,896). It tops the truck ranking too, with the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Capital BeltwayMotorway · 172,340vehicles13,368trucks · 7.8%
Road class
Motorway
Congestion ratio
96.9%
Median trip time
46.0 min
Drivers’ median age
44.0 yrs
Drivers’ average income
$146,855

Capital Beltway is one of the more congested roads here: trips take 97% longer than at free-flow speed, against 21% county-wide.

2I 270 SpurMotorway · 109,896vehicles10,997trucks · 10.0%
Road class
Motorway
Congestion ratio
73.6%
Median trip time
43.6 min
Drivers’ median age
47.1 yrs
Drivers’ average income
$171,038

I 270 Spur carries 12.6 times the county average on its busiest stretch, where the median trip lasts 43.6 minutes.

3I 270Motorway · 82,400vehicles5,537trucks · 6.7%
Road class
Motorway
Congestion ratio
80.8%
Median trip time
39.6 min
Drivers’ median age
45.3 yrs
Drivers’ average income
$148,687

Delays build on I 270: its congestion ratio of 81% over free-flow time is well above the county's 21%.

4Eisenhower Memorial HighwayMotorway · 80,158vehicles7,725trucks · 9.6%
Road class
Motorway
Congestion ratio
76.8%
Median trip time
37.0 min
Drivers’ median age
45.0 yrs
Drivers’ average income
$138,481

At 9.2 times the county average, Eisenhower Memorial Highway draws drivers from neighborhoods averaging $138,481 in household income.

5I 370Motorway · 73,446vehicles5,400trucks · 7.3%
Road class
Motorway
Congestion ratio
54.3%
Median trip time
34.6 min
Drivers’ median age
45.7 yrs
Drivers’ average income
$149,240

A main artery: I 370's busiest stretch carries 8.4 times the county average; trucks are 7.3% of it, above the county-wide 5.7%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Capital BeltwayMotorway · #1 by traffic172,340vehicles13,368trucks · 7.8%
2I 270 SpurMotorway · #2 by traffic109,896vehicles10,997trucks · 10.0%
3Eisenhower Memorial HighwayMotorway · #4 by traffic80,158vehicles7,725trucks · 9.6%
4I 270Motorway · #3 by traffic82,400vehicles5,537trucks · 6.7%
5I 370Motorway · #5 by traffic73,446vehicles5,400trucks · 7.3%
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

MontgomeryDepartment 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 Montgomery County

The same traffic breakdown for the areas closest to Montgomery County, Maryland.

Need segment-level traffic data?

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