Louisiana Highway 22 is a state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 in Louisiana

Louisiana

Louisiana is a state located in the southern region of the United States of America. Its capital is Baton Rouge and largest city is New Orleans. Louisiana is the only state in the U.S. with political subdivisions termed parishes, which are local governments equivalent to counties...

 that serves St. Tammany, Tangipahoa, Livingston, and Ascension Parishes. It spans 71.85 miles (115.6 km) in a rough east/west direction and is bannered in each cardinal direction (depending on the location).

Route description

From the east, LA 22 begins at an intersection with U.S. Highway 190 in Mandeville. LA 22 then runs due west, intersecting LA 21 in Madisonville. LA 22 then enters Tangipahoa Parish, where it is cosigned for approximately 1 mile with LA 445 south of Robert

Robert, Louisiana

Robert is an unincorporated community in Tangipahoa Parish, Louisiana, United States. It lies east of Hammond, at the intersection of US 190 and LA 445, from which it has a signed exit on Interstate 12...

. Continuing due west, LA 22 intersects U.S. Highway 51 and then Interstate 55

Interstate 55

Interstate 55 is an Interstate Highway in the central United States. Its odd number indicates that it is a north–south Interstate Highway. I-55 goes from LaPlace, Louisiana at Interstate 10 to Chicago at U.S. Route 41 , at McCormick Place. A common nickname for the highway is "double...

 in Ponchatoula. In Livingston Parish, LA 22 intersects LA 42

Louisiana Highway 42

Louisiana Highway 42 is a state highway in Louisiana that serves East Baton Rouge, Ascension Parish, Livingston Parish and Tangipahoa Parish. It spans in roughly a East North East direction.-Route description:...

 in Springfield and then turns southwestward. LA 22 passes through Killian and intersects LA 16 south of French Settlement before entering Ascension Parish. In Ascension Parish, LA 22 intersects US 61(Airline Highway

Airline Highway

Airline Highway is a divided highway in the U.S. state of Louisiana, built in the 1930s and 1940s to bypass the older Jefferson Highway. It carries U.S. Highway 61 from New Orleans northwest to Baton Rouge, and U.S. Highway 190 from Baton Rouge west over the Mississippi River on the Huey P. Long...

), Interstate 10

Interstate 10

Interstate 10 is the fourth-longest Interstate Highway in the United States, after I-90, I-80, and I-40. It is the southernmost east–west, coast-to-coast Interstate Highway, although I-4 and I-8 are further south. It stretches from the Pacific Ocean at State Route 1 in Santa Monica,...

, and LA 70 in Sorrento. LA 22 then intersects LA 44 before ending at an intersection with LA 75 and LA 942

Louisiana Highway 942

Louisiana Highway 942 is a state highway in Louisiana that serves Ascension Parish. It spans in a southwest to northeast direction. It is locally known as River Road.-Route description:...

 at the Mississippi River

Mississippi River

The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...

 at Darrow.

LA 22 is prevailingly an undivided, two-lane highway. At is eastern terminus with US 190, LA 22 is four-lane divided and shortly goes to five lanes undivided (with a center turn lane) and then three lanes undivided (two-way traffic with a center turn lane). The center turn lane disappears east of Madisonville, and the highway is two lane until Ponchatoula, through which it is four or five lanes undivided. West of Ponchatoula, LA 22 narrows to two lanes but retains broad shoulders to Springfield, from which it is a two-lane road for the remainder.