Each day 30,000 cars cross Lake Pontchartrain on the longest bridge in the world, The Lake Pontchartrain Causeway.
The Causeway consists of two parallel bridges that cross Lake Pontchartrain in southern Louisiana.
The longer of the two bridges is 23.87 miles (38.42 km) long.
Both spans have a 65-mph speed limit 24 hours per day.
Look at this picture of the longest bridge in the world: