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It may be constructed as a ' coffer dam ': two parallel steel sheet pile or concrete retaining walls, anchored to each other with steel cables or rods. This construction may also serve as a dyke that keeps two bodies of water apart, e.g. with a different water level on both sides, and/or with salt water on one side and fresh water on the other side (this may also be the primary purpose, the road being a side benefit).

Examples include those that connect Singapore and Venice to the mainland. In the Netherlands there are a number of prominent dykes which double as causeways, including the AfsluitdijkThe Afsluitdijk (Closure-dike) is a major dam in the Netherlands, constructed between 1927 and 1933 and running from Den Oever on Wieringen in North Holland to the village of Zurich (mun. Wunseradiel) in Friesland over a length of 32 km and a width of 90, Brouwersdam , and Markerwaarddijk. In LouisianaLouisiana is a southern state of the United States of America. It uses the U. postal abbreviation LA . The state is bordered to the west by the state of Texas, to the north by Arkansas, to the east by the state of Mississippi, and to the south by the Gulf, a very long causeway takes Interstate 10Interstate 10 or I-10 is the southernmost coast-to-coast interstate highway in the United States. It stretches from California Highway 1, or the Pacific Coast Highway in Santa Monica, California to Jacksonville, Florida, ending at Interstate 95. A sign ne across Lake PontchartrainLake Pontchartrain is a large lake in southeastern Louisiana. Lake Pontchartrain is roughly oval in shape, about 40 miles wide from east to west, and measures about 25 miles from north to south. The south shore of Lake Pontchartrain forms the northern bou for several mileA mile is any of several units of distance, or, as physicists say, of length. Today, one mile is mainly equal to about 1609 metres on land and 1852 metres at sea and in the air, but see below for the details. Current definitions The meanings of mile thats or kilometers.

Causeways are also common in FloridaFlorida is a southern state in the United States. It is known as the Sunshine State. Florida" is a Spanish adjective which means "flowery". It was discovered by Spanish explorers during the Easter season, which is called Pascua Florida in Spanish. Postal, where low bridges may connect several manmade islands, often with a much higher bridge (or part of a single bridge) in the middle so that taller boats may pass underneath safely. Causeways are most often used to connect the barrier islands with the mainland.

Causeways are often a problem with an approaching hurricane or strong tropical storm, because the high winds and waves make them dangerous. Along with traffic jams, this is a major reason why evacuations are done so early on islands.

Causeways affect currents and may therefore be involved in beach erosion or changed deposition patterns.

The oldest engineered road yet discovered is the Sweet Track in England, dating from the 3800s BC.