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Traffic heat map of Calvert County, Maryland: 270 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Solomons Island Road

Calvert County, Maryland Traffic Counts

Our Calvert County, Maryland traffic data covers 7,143 road segments over 270 road miles, with an average segment of just 199 ft. Trips here are the shortest of any county in Maryland, a median 28.5 minutes. 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 Calvert County, Maryland

Traffic

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

vehicles per day5,326
Trucks

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

5.9%
Average travel time

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

28.5 min
Congestion ratio

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

14.7%
Drivers’ average age

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

47.3 yrs
Drivers’ average income

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

$132,452

A typical monitored road in Calvert County, Maryland sees 5,326 vehicles per day, while its 270 miles of monitored roads together handle 1,941,348 vehicle-miles traveled per day (≈709 million per year). Trucks are a smaller part of the mix than across Maryland: 5.9% against 7.5%.

The shortest trips of any county in Maryland

Calvert's average daily traffic volume is 31% lower than the state average - 5,326 vehicles per day against 7,693 - suggesting less traffic load per road - lighter roads for freight, but less passing trade for roadside retail. Across the whole network, that travel is about 1.4% of Maryland's statewide total. 52% of counties in Maryland see less traffic than Calvert's 5,326 vehicles per day.

Journey times run 16% lower than the state level, at 28.5 minutes on average. Calvert additionally records the lowest average travel time of any county in Maryland - 28.5 minutes.

At 28% lower than the state level, the 14.7% congestion ratio signals smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Calvert County, Maryland

Trafficvehicles per day17,859
Trucks6.4%
Average travel time32.8 min
Congestion ratio40.1%
Drivers’ average age47.0 yrs
Drivers’ average income$132,511

Highways carry more than half of all travel in Calvert County, Maryland (61% of vehicle-miles). The average highway carries 17,859 vehicles per day, 358% more than the average non-highway road in the same area, which carries 3,904 vehicles per day.

With 27% of the road miles (72 miles in 728 segments), highways punch above their length, carrying 1,182,167 vehicle-miles traveled per day (≈431 million per year).

Lower highway truck share than 91% of counties in Maryland

Highway truck concentration here runs 34% lower than the state average, at 6.4%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

Calvert's highway truck share (6.4%) is lower than 91% of counties in Maryland. 83% of counties in Maryland see more highway trucks per day than Calvert's roughly 1,148.

non-highway traffic icon

Non-highway Traffic in Calvert County, Maryland

Trafficvehicles per day3,904
Trucks5.0%
Average travel time28.0 min
Congestion ratio11.8%
Drivers’ average age48.0 yrs
Drivers’ average income$132,375

A significant share of driving in Calvert County, Maryland, 39% of vehicle-miles, happens on local roads. The average non-highway road carries 3,904 vehicles per day.

Local roads make up 73% of the monitored road miles (197 miles in 6,415 segments) but carry less than their share of travel: 759,181 vehicle-miles traveled per day (≈277 million per year). Trucks make up 5.0% of non-highway traffic, about 1 in 20 vehicles.

Drivers from higher-income areas than 91% of counties in Maryland

Non-highway roads carry a truck concentration that's 22% lower than the highway network.

Non-highway congestion (11.8%) runs 38% lower than the state average, pointing to smoother local traffic flow.

91% of counties in Maryland see lower average driver income among trip origins than Calvert. Calvert's median driver age is lower than 52% of counties in Maryland.

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–6:00 PM, with volumes reaching approximately 87% 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:
June–August is the high season, with volumes +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 Calvert County, Maryland, the peak hour concentrates about 8% of the day's traffic, and there is a noticeable seasonal swing of +4% in high season.

Calvert County vs. Maryland Traffic Comparison

Of the four measures, highway truck share differs most: Calvert County runs 34% below the Maryland average. Its average daily traffic per road is also 31% below.

MetricCalvert CountyMaryland averageDifference
Traffic5,3267,693-30.8%
Truck % (Total Traffic)5.9%7.5%-21.5%
Truck % (Highway)6.4%9.8%-34.1%
Avg. Travel Time28.5 min34.0 min-16.2%

How Calvert County compares

Calvert County is the least congested of its nearby counties

Compared with its 4 closest neighbours, Calvert County moves 27.3% of the total daily travel and is 25.0% less congested; it has the quietest roads of the five. Less traffic and more room for it - the roads here run both quieter and freer than the areas around them.

Calvert 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
Calvert County5,3265.9%1,941,34828.5 min14.7%
St. Mary's County, Maryland6,0035.3%2,184,01430.5 min16.3%
Charles County, Maryland6,8545.6%3,168,98932.4 min17.9%
Prince George's County, Maryland11,0766.7%21,646,15134.9 min24.7%
Talbot County, Maryland5,8238.9%1,401,04338.2 min19.6%
Maryland average7,6937.5%N/A34.0 min20.5%

Calvert County ranked within Maryland

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

Calvert County ranked among 24 county-level areas in Maryland (1 = highest).
MeasureCalvert CountyMaryland rank
Traffic volume (AADT)5,326#12 of 24
Highway vehicle-miles per day1,182,167#16 of 24
Truck share on highways6.4%#22 of 24
Highway trucks per day1,148#20 of 24
Average travel time28.5 min#24 of 24
Average driver income$132,452#3 of 24
Average driver age47.3 yrs#13 of 24

The two ends of this table sit far apart: #3 of 24 on average driver income, against #24 of 24 on average travel time.

Busiest roads in Calvert County, Maryland

The three busiest roads in Calvert County average 36,132 vehicles a day, 6.8 times the county average of 5,326 across all its monitored roads.

Solomons Island Road leads with 41,723 vehicles a day, 2,604 of them trucks (6.2%). It also carries the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Solomons Island RoadTrunk road · 41,723vehicles2,604trucks · 6.2%
Road class
Trunk road
Congestion ratio
46.6%
Median trip time
32.7 min
Drivers’ median age
47.4 yrs
Drivers’ average income
$135,052

Travel on Solomons Island Road's busiest stretch runs 47% over free-flow time, against 15% across the county, so expect slower peak hours.

2Thomas Johnson BridgeTrunk road · 33,905vehicles1,584trucks · 4.7%
Road class
Trunk road
Congestion ratio
86.6%
Median trip time
31.0 min
Drivers’ median age
45.8 yrs
Drivers’ average income
$119,384

Thomas Johnson Bridge is one of the more congested roads here: trips take 87% longer than at free-flow speed, against 15% county-wide.

3Southern Maryland BoulevardTrunk road · 32,768vehicles2,266trucks · 6.9%
Road class
Trunk road
Congestion ratio
34.3%
Median trip time
35.2 min
Drivers’ median age
47.3 yrs
Drivers’ average income
$145,861

A main artery: Southern Maryland Boulevard's busiest stretch carries 6.2 times the county average; trucks are 6.9% of it, above the county-wide 5.9%.

4Hallowing Point RoadPrimary road · 16,271vehicles958trucks · 5.9%
Road class
Primary road
Congestion ratio
40.0%
Median trip time
33.7 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$128,803

On its busiest stretch, Hallowing Point Road carries 3.1 times the county average; trucks are 5.9% of it, in line with the county-wide 5.9%.

5Prince Frederick RoadPrimary road · 14,689vehicles939trucks · 6.4%
Road class
Primary road
Median trip time
35.8 min
Drivers’ median age
48.3 yrs
Drivers’ average income
$132,009

Prince Frederick Road peaks at 14,689 vehicles a day, 2.8 times the county average; trucks are 6.4% of it, above the county-wide 5.9%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Solomons Island RoadTrunk road · #1 by traffic41,723vehicles2,604trucks · 6.2%
2Southern Maryland BoulevardTrunk road · #3 by traffic32,768vehicles2,266trucks · 6.9%
3Thomas Johnson BridgeTrunk road · #2 by traffic33,905vehicles1,584trucks · 4.7%
4Hallowing Point RoadPrimary road · #4 by traffic16,271vehicles958trucks · 5.9%
5Prince Frederick RoadPrimary road · #5 by traffic14,689vehicles939trucks · 6.4%
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

CalvertDepartment 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 Calvert County

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

Need segment-level traffic data?

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