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Traffic heat map of St. John the Baptist Parish, Louisiana: 187 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 10 and I 55

St. John the Baptist Parish, Louisiana Traffic Counts

It ranks among the top 5 counties in Louisiana for average daily traffic. This page breaks down traffic in St. John the Baptist Parish, Louisiana across 187 miles of monitored roads split into 2,307 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
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 St. John the Baptist Parish, Louisiana

Traffic

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

vehicles per day8,413
Trucks

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

17.4%
Average travel time

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

33.6 min
Congestion ratio

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

16.4%
Drivers’ average age

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

45.2 yrs
Drivers’ average income

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

$78,143

The average monitored road in St. John the Baptist Parish, Louisiana carries 8,413 vehicles per day. Across its 187 miles of monitored roads, that adds up to 1,742,098 vehicle-miles traveled per day (≈636 million per year). Freight weighs heavily here: trucks are 17.4% of traffic, against 11.2% across Louisiana.

Busier roads than 95% of counties in Louisiana

St. John the Baptist's average daily traffic volume is 39% higher than the state average - 8,413 vehicles per day against 6,061 - suggesting more traffic load per road - a busier backdrop for retail sites, at the cost of slower access. Across the whole network, that travel is about 1.4% of Louisiana's statewide total. By volume, St. John the Baptist's 8,413 vehicles per day outpaces 95% of counties in Louisiana.

Journey times run 6% higher than the state level, at 33.6 minutes on average. On travel time, St. John the Baptist runs longer than 63% of counties in Louisiana.

Congestion here (16.4%) closely tracks the state level.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in St. John the Baptist Parish, Louisiana

Trafficvehicles per day18,375
Trucks18.6%
Average travel time36.1 min
Congestion ratio28.9%
Drivers’ average age45.1 yrs
Drivers’ average income$78,209

Highways carry the vast majority of travel in St. John the Baptist Parish, Louisiana, 83% of all vehicle-miles. The average highway carries 18,375 vehicles per day, 484% more than the average non-highway road in the same area, which carries 3,146 vehicles per day.

Highways make up 50% of the monitored road miles (93 miles, 798 segments), so they carry more than their share: 1,443,574 vehicle-miles traveled per day (≈527 million per year).

That is more highway travel volume than 71% of counties in Louisiana.

Higher highway truck share than 71% of counties in Louisiana

At 18.6%, highway truck share is 16% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

71% of counties in Louisiana see a lower highway truck share than St. John the Baptist's 18.6%. St. John the Baptist's highway truck count is higher than 71% of counties in Louisiana, at roughly 3,412 trucks per day.

non-highway traffic icon

Non-highway Traffic in St. John the Baptist Parish, Louisiana

Trafficvehicles per day3,146
Trucks11.7%
Average travel time32.3 min
Congestion ratio9.9%
Drivers’ average age46.3 yrs
Drivers’ average income$77,851

Local roads carry a smaller share of travel in St. John the Baptist Parish, Louisiana, 17% of vehicle-miles; most driving happens on highways. A typical local road sees 3,146 vehicles per day.

Spread over 93 miles and 1,509 segments, 50% of the road network, local roads carry a lighter load per mile: 298,524 vehicle-miles traveled per day (≈109 million per year). The truck share on non-highway roads is 11.7%.

Drivers from higher-income areas than 76% of counties in Louisiana

Compared to highways, non-highway routes see 37% fewer trucks by share.

The non-highway congestion ratio of 9.9% is 41% lower than the state level, suggesting more efficient local mobility than the state average.

Trip origins here have higher average income than 76% of counties in Louisiana. 57% of counties in Louisiana have an older driver population than St. John the Baptist.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 5:00 AM to 12:00 PM and PM peak 4:00 PM–7:00 PM, with volumes reaching approximately 66% 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 February–April, the busiest stretch, runs only +2% versus the annual average.
Lowest month:
December is the quietest month, with volumes -4% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In St. John the Baptist Parish, Louisiana, the peak hour concentrates about 7% of the day's traffic, and traffic stays steady through the year (+2% in high season).

St. John the Baptist Parish vs. Louisiana Traffic Comparison

Of the four measures, truck share differs most: St. John the Baptist Parish runs 55% above the Louisiana average. Its average daily traffic per road is also 39% above.

MetricSt. John the Baptist ParishLouisiana averageDifference
Traffic8,4136,061+38.8%
Truck % (Total Traffic)17.4%11.2%+55.4%
Truck % (Highway)18.6%16.1%+15.7%
Avg. Travel Time33.6 min31.8 min+5.8%

How St. John the Baptist Parish compares

St. John the Baptist Parish has a higher truck share than any nearby parish

Set against the average of the 4 areas nearest to it, St. John the Baptist Parish runs 5.2 percentage points more truck traffic; it has the busiest roads of the five.

St. John the Baptist Parish and the 4 nearest county-level areas by centroid distance, with the Louisiana average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
St. John the Baptist Parish8,41317.4%1,742,09833.6 min16.4%
St. Charles Parish, Louisiana7,01013.1%2,317,80233.9 min19.5%
St. James Parish, Louisiana4,06814.0%955,97534.6 min11.0%
Ascension Parish, Louisiana7,40210.8%2,826,41430.6 min20.0%
Livingston Parish, Louisiana6,25610.8%3,778,60029.1 min16.6%
Louisiana average6,06111.2%N/A31.8 min17.3%

St. John the Baptist Parish ranked within Louisiana

Average daily traffic volume places St. John the Baptist Parish #4 of 64 in Louisiana - the top quarter of the state.

St. John the Baptist Parish ranked among 64 county-level areas in Louisiana (1 = highest); measures without data in every county rank a smaller field, down to 57.
MeasureSt. John the Baptist ParishLouisiana rank
Traffic volume (AADT)8,413#4 of 64
Highway vehicle-miles per day1,443,574#17 of 57
Truck share on highways18.6%#17 of 57
Highway trucks per day3,412#17 of 57
Average travel time33.6 min#24 of 64
Average driver income$78,143#16 of 64
Average driver age45.2 yrs#37 of 64

Busiest roads in St. John the Baptist Parish, Louisiana

The three busiest roads in St. John the Baptist Parish average 31,009 vehicles a day, 3.7 times the county average of 8,413 across all its monitored roads.

I 10 is the busiest road, at 42,842 vehicles a day, 8,640 of them trucks (20.2%). That is 61% more than the next road, I 55 (26,635). It tops the truck ranking too, with the most trucks.

Trips using I 10 are long: a median of 52.7 minutes against 33.6 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 10Motorway · 42,842vehicles8,640trucks · 20.2%
Road class
Motorway
Congestion ratio
47.2%
Median trip time
52.7 min
Drivers’ median age
43.8 yrs
Drivers’ average income
$86,860

Delays build on I 10: its congestion ratio of 47% over free-flow time is well above the county's 16%.

2I 55Motorway · 26,635vehicles5,206trucks · 19.5%
Road class
Motorway
Congestion ratio
28.8%
Median trip time
49.7 min
Drivers’ median age
44.3 yrs
Drivers’ average income
$73,639

Drivers on I 55 are on long journeys, a median 49.7 minutes against 33.6 county-wide: a through route more than a local street.

3Airline HighwayTrunk road · 23,549vehicles2,578trucks · 10.9%
Road class
Trunk road
Congestion ratio
28.7%
Median trip time
32.2 min
Drivers’ median age
46.0 yrs
Drivers’ average income
$72,692

At 2.8 times the county average, Airline Highway draws drivers from neighborhoods averaging $72,692 in household income.

4Belle Terre BoulevardTrunk road · 15,953vehicles1,354trucks · 8.5%
Road class
Trunk road
Congestion ratio
36.5%
Median trip time
34.2 min
Drivers’ median age
45.8 yrs
Drivers’ average income
$77,273

Travel on Belle Terre Boulevard's busiest stretch runs 36% over free-flow time, against 16% across the county, so expect slower peak hours.

5Gramercy BridgePrimary road · 12,698vehicles1,918trucks · 15.1%
Road class
Primary road
Median trip time
45.0 min
Drivers’ median age
46.0 yrs
Drivers’ average income
$74,761

Gramercy Bridge carries through traffic: the median trip using it lasts 45.0 minutes, against 33.6 for the county.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 10Motorway · #1 by traffic42,842vehicles8,640trucks · 20.2%
2I 55Motorway · #2 by traffic26,635vehicles5,206trucks · 19.5%
3US 51Trunk road · 12,055vehicles2,763trucks · 22.9%
Road class
Trunk road
Congestion ratio
15.6%
Median trip time
43.2 min
Drivers’ median age
44.6 yrs
Drivers’ average income
$77,314

US 51 peaks at 12,055 vehicles a day, 43% more than the county average; trucks are 22.9% of it, above the county-wide 17.4%.

4Airline HighwayTrunk road · #3 by traffic23,549vehicles2,578trucks · 10.9%
5Gramercy BridgePrimary road · #5 by traffic12,698vehicles1,918trucks · 15.1%
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

St. John the BaptistDepartment 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 St. John the Baptist Parish

The same traffic breakdown for the areas closest to St. John the Baptist Parish, Louisiana.

Need segment-level traffic data?

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