Four bridges cross the Mississippi in this metro and three cross the lake. That is the whole commute. Here is what the agency data says, when each corridor peaks, and how to find the best time to leave for your route.
Twenty-four miles with twelve places to stop
The Causeway holds the Guinness World Record for the longest bridge over water (continuous) at 38.422 km — 23.87 miles — a record it has held since 1969, when the second span was completed. (Guinness split the category in 2011; China's Qingdao Jiaozhou Bay Bridge took the aggregate record, so the word continuous does real work here.)
The Commission's own figures: about 40,000 vehicles a day, and over 3,000 motorist breakdowns or calls for assistance a year, with police response averaging under four minutes.
For most of the bridge's life there was nowhere to pull over. The Commission's safety improvements page states that before the recent project, the only emergency areas were crossovers roughly four miles apart, hard to enter and exit safely. The project added twelve segmented shoulders — six northbound, six southbound, each 600 to 1,000 feet long — and raised the southbound railing from 25 inches of concrete to 46 inches with added steel. The Commission reports emergency stopping area tripled, rear-end crashes down 30%, rollovers down 50%, and no vehicle over the rail since.
You pay to come into the city and nothing to leave it: the toll is $3.40 with a tag, $6.00 cash, collected southbound only. Northbound collection was dropped in 1999 specifically to ease congestion on the south shore.
In fog, a police car leads everyone across
This is the detail that makes a departure-timing decision genuinely consequential here.
The Commission publishes fog procedures with two named restriction phases:
- Single-lane restrictions — cones close the left lane, all traffic uses the right, passing prohibited. Used on the span opposite peak travel, and on both spans off-peak.
- Rolling convoy restrictions — both lanes in use, but an emergency vehicle leads from the toll plaza setting the pace, with no passing and no lane changes. Used on the peak-travel span.
A ranking police officer decides when to implement them. The Commission does not publish the visibility numbers that trigger either phase, and it publishes no high-wind policy at all.
The same document confirms the Causeway's peak direction, which is the one corridor in the metro where that is officially stated: southbound in the morning, northbound in the evening — north shore into Jefferson Parish and back.
When is New Orleans traffic worst?
The Expressway Commission's traffic page gives the only official window I can find for the region: "most traffic to be between 6:00 AM to 9:00 AM and 3:30 PM to 6:30 PM during weekday commuting hours." Neither LADOTD nor the Regional Planning Commission publishes a rush-hour definition.
By corridor:
- I-10, including the High Rise and the Twin Span — the region's spine. The High Rise carries six lanes over the Industrial Canal. The Twin Span crosses the eastern lake between New Orleans and Slidell: 5.5 miles, six lanes, around 55,000 vehicles a day, rebuilt after Katrina for $803 million.
- I-610 — a 4.52-mile bypass of the Central Business District, carrying roughly 68,000–70,900 vehicles a day.
- US-90 Business, the Pontchartrain Expressway — six elevated lanes through the CBD over seven miles, including two reversible HOV lanes added near the Superdome.
- The Crescent City Connection — twin cantilever bridges over the Mississippi, four through lanes each span plus two reversible HOV lanes, 163,126 vehicles a day as of LADOTD's 2019 count. Untolled since 2013.
- The Lake Pontchartrain Causeway — 24 miles, 40,000 a day, tolled southbound.
- I-510 / Paris Road — a 3.04-mile spur through eastern New Orleans toward the NASA Michoud facility.
One correction worth making, because a local reader will catch it: the Crescent City Connection carries US-90 Business, not I-10. I-10 does not cross the Mississippi in New Orleans at all.
Prefer a leave-by time to a set of windows? Put your arrival time into the departure time calculator and it will work out when to go.
Four Mississippi bridges, three lake bridges
That is the entire crossing inventory for a metro of this size.
Across the Mississippi, in downstream order: the Gramercy Bridge, the Hale Boggs Memorial Bridge (I-310), the Huey P. Long Bridge (US-90), and the Crescent City Connection. Below the Crescent City Connection there are no bridges at all — only ferries. It is the last bridge on the Mississippi River.
Across Lake Pontchartrain: the Causeway, the I-10 Twin Span, and the US-11 Maestri Bridge — 4.8 miles, opened in 1928, running parallel to the Twin Span. The Maestri is explicitly an alternate when hurricanes threaten: it took only minor damage in Katrina while the Twin Span was impassable for over six weeks.
Seven crossings total. The reversible HOV lanes on the Crescent City Connection and the Pontchartrain Expressway tell you which way the metro moves — inbound in the morning, outbound in the evening.
Three New Orleans-specific things that move the peak
- Hurricane season runs 1 June to 30 November, and contraflow is a real schedule. NOAA puts the Atlantic season's peak on 10 September. Louisiana's evacuation plan runs in three phases keyed to hours before tropical-storm winds reach the coast — Phase 1 at 50 hours, Phase 2 at 40, and Phase 3 at 30 hours, which is when contraflow is enacted and when eastbank New Orleans inside the levees evacuates. Contraflow reverses I-10 West from Clearview Parkway to I-55, I-55 North, I-12, and I-10 East onto I-59. State research measured contraflow raising twelve-hour outbound capacity by 36% to 97% depending on the loading plan.
- Mardi Gras is a fortnight of road closures, not a day. For 2026 the City activated its Emergency Operations Center for major parades from 6 February through 17 February — twelve days — with St. Charles Avenue, Canal Street, Louisiana Avenue, Howard Avenue and the Endymion route all affected. RTA bus detours begin two hours before each parade's start time. The Canal and St. Charles streetcar lines were suspended from 12 February with a 24-hour bus bridge.
- Fog on the lake changes the rules, not just the speed. See above. The convoy phase means your crossing time is set by a police vehicle, not by you, and the Commission gives no advance notice of thresholds. This is the clearest case anywhere for checking conditions before leaving rather than after — see leave-time apps with weather alerts.
Why your best time is route-specific
The Causeway peaks southbound in the morning; the Crescent City Connection's reversible lanes say the river crossing does the same; the Twin Span serves Slidell commuters on a different clock entirely. A trip that crosses water is a different category of risk from one that does not. Citywide advice smooths over exactly the differences that decide your drive. Nationally, the worst day of the week varies by city too.
Driving the I-10 corridor west? See the best time to leave Houston. East on I-10 and I-65, Atlanta and Nashville are the next metros.
Find the best time to leave for your New Orleans route
Google Maps and Waze show live traffic and turn-by-turn once you are already on the road. BoardSpy is the leave-time app: it checks your saved New Orleans route before you leave, recommends when to go, sends traffic and weather alerts, and tracks delay and on-time stats including your best and worst days. When you set off, it opens your map app for turn-by-turn. For how routing apps differ from departure-timing tools, see best app to avoid traffic.
Nearby cities
Every metro is listed on Best time to leave by city.
Frequently asked questions
What is the best time to leave to avoid traffic in New Orleans?
Before 6:00 a.m. or after 9:00 a.m. in the morning, and outside 3:30–6:30 p.m. in the evening — the windows the Greater New Orleans Expressway Commission publishes for weekday commuting. Neither LADOTD nor the Regional Planning Commission publishes a rush-hour definition, so the Commission's figures are the official ones available. If your route crosses the Causeway, fog matters more than the hour.
When is New Orleans rush hour?
The Greater New Orleans Expressway Commission states that most traffic falls between 6:00 a.m. and 9:00 a.m. and between 3:30 p.m. and 6:30 p.m. on weekdays. The Causeway's own fog procedures identify the peak travel direction as southbound in the morning and northbound in the evening.
How long is the Lake Pontchartrain Causeway and what does it cost?
It is 24 miles long — 38.422 km, or 23.87 miles, by the Guinness World Record measurement for the longest continuous bridge over water, a record it has held since 1969. The toll is $3.40 with a toll tag or $6.00 cash, collected southbound only. Northbound collection was eliminated in 1999 to ease congestion on the south shore, so you pay to come into the city and nothing to leave.
What happens on the Causeway in fog?
The Commission operates two published restriction phases. Under single-lane restrictions, cones close the left lane, all traffic uses the right and passing is prohibited. Under rolling convoy restrictions, both lanes stay open but an emergency vehicle leads from the toll plaza setting the pace, with no passing and no lane changes. A ranking police officer decides when to implement them, and the Commission does not publish the visibility thresholds that trigger either phase.
How many bridges cross the Mississippi in New Orleans?
Four in the metro area: the Gramercy Bridge, the Hale Boggs Memorial Bridge carrying I-310, the Huey P. Long Bridge carrying US-90, and the Crescent City Connection carrying US-90 Business. Below the Crescent City Connection there are no bridges at all — only ferries — making it the last bridge on the Mississippi River. Three bridges cross Lake Pontchartrain: the Causeway, the I-10 Twin Span and the US-11 Maestri Bridge.
How do I find the best time to leave for my New Orleans commute?
Use a leave-time commute app that reads your actual route rather than only a live map. BoardSpy recommends when to leave for your New Orleans route, sends pre-departure traffic and weather alerts, and tracks on-time performance and your best and worst traffic days. Download it here.