Some causeways may only be usable at low tide and the distinction between causeways and viaducts can become blurred when flood-relief culverts are incorporated in the structure ; a causeway is however primarily supported on earth or stone, whereas a bridge or viaduct is mainly supported by free-standing columns or arches.

In addition, there would have been constructed high-span bridges across the Demerara River at the same site as the Demerara Harbour Bridge, and the Berbice River upstream of Everton ; a series of bridges and causeways linking the islands in the mouth of the Essequibo River to Morasi on the East Bank and Supenaam on the West Bank ; and another high-span bridge across the Essequibo River at Monkey Jump.

Roads for vehicles and railroads have inclined planes in the form of gradual slopes, ramps, and causeways to allow vehicles to surmount vertical obstacles such as hills without losing traction on the road surface.

Great Bernera and Scalpay have bridge connections to Lewis and Harris respectively, with causeways linking Baleshare and Berneray to North Uist, Eriskay to South Uist, Flodaigh, Fraoch-eilean and the southern Grimsay to Benbecula, and Vatersay to Barra.

They are also the oldest causeways on the Gulf Coast that have never been put out of commission for an extended period of time following a hurricane.

Other interpretations have seen the causeways as symbolic of multi-directional access to the site by scattered communities, the enclosures as funerary centres for excarnation or the construction of the site being a communal act of creation by a fragmented society.

The causeways have never sustained major damage of any sort from hurricanes or other natural occurrences, a rarity in the causeway community.

And any Spanish assault would have to come through the causeways, where the Aztecs could easily attack them.

The most important changes to wetland habitats and ecologic processes have resulted from changed river inflows and sediment loads from the watershed combined with changing hydraulic and geomorphic effects from bridge causeways.

According to C. Michael Hogan, the Wadden Sea is one of the world's seas whose coastline has been most modified by humans, via systems of dikes and causeways on the mainland and low lying coastal islands.

There were three main streets that crossed the city, each leading to one of the three causeways to the mainland ; Bernal Díaz del Castillo reported that they were wide enough for ten horses.

It is connected to mainland Florida to the north ; with the city of Tampa to the east by causeways and bridges across Tampa Bay ; and to Bradenton in the south by the Sunshine Skyway Bridge ( Interstate 275 ), which traverses the mouth of the bay.

New blockships were sunk, booms and mines were placed over the main entrances, increased anti-aircraft batteries were installed at crucial points, and Winston Churchill ordered the construction of a series of causeways to block the eastern approaches to Scapa Flow ; they were built by Italian prisoners of war held in Orkney.

Southeast sector settlement work continues ; Agricultural fields, housing, and causeways demonstrated to be post-war phenomena.

As a result barriers were built to close most of the access channels ; these had the additional advantage of creating causeways enabling travellers to go from island to island by road instead of being obliged to rely on ferries.

He had planned to attack on the causeways during the daytime and retreat to camp at night ; however, the Aztecs moved in to occupy the abandoned areas as soon as the Spanish forces left.

The wetland is divided by causeways into four basins ; Gagribal, Lokut Dal, Bod Dal and Nagin ( although Nagin is also considered as an independent lake ).

The main basin draining the lake is a complex of five interconnected basins with causeways ; the Nehru Park basin, the Nishat basin, the Hazratbal basin, the Nagin basin and the Barari Nambad basin.

As a result barriers were built to close most of the access channels ; these had the additional advantage of creating causeways whereby travellers can go from island to island by road instead of being obliged to rely on boats.

The central cairn is of the ring cairn sub-type, and uniquely has stone paths or causeways forming " rays " radiating out from the platform round the kerbs to three of the standing stones.

Gan Island has now a hotel catering for tourists and is connected by causeways to the neighboring islands of Feydu, Maradu and Hithadhoo.

Castle Island was originally some distance offshore, but land reclamation for expansion of port facilities has extended the mainland towards it, and it is now connected to the mainland by pedestrian and vehicle causeways.

At some level sections in Lincolnshire it has causeways of never-disturbed ground crossing it and it passes in gradients, up and down the sides of slight ridges.

During hurricane seasons, the winds and rains of approaching tropical storms -- as well as waves generated by the storm in the surrounding bodies of water — make traversing causeways problematic at best and impossibly dangerous during the fiercest parts of the storms.

Larger crannogs could be occupied by extended families or communal groups, and access was either by logboats or coracles while evidence for timber or stone causeways exists on a large number of crannogs.

# Where possible, improve access to a full diversity of habitats by removing, breeching or bypassing impediments to migration such as nonfunctional dams, dikes or causeways.

550 were taken to Camp 60, where they were put to work building the Churchill Barriers, four causeways created to block access to Scapa Flow.

They constructed the Churchill Barriers, four causeways created to block access to Scapa Flow.

Sometimes aqueducts took carriers over drains, and causeways and culverts provided access for wagons.

The bridge formed a natural defense point since it was on the only road leading south from Norfolk toward North Carolina, it was bordered on both sides by the Great Dismal Swamp, and the access to the bridge on both sides was via narrow causeways.

The island is also linked to Eriskay and Benbecula by causeways.

In the Netherlands there are a number of prominent dykes which also double as causeways, including the Afsluitdijk, Brouwersdam, and Markerwaarddijk.

The causeways were constructed by Italian prisoners of war, who also constructed the ornate Italian Chapel.

BRO units also handle the construction of permanent and temporary bridges, causeways, and airfields.

Vestiges also are found in two broad paved causeways of the two main streets of Athribis, which crossed each other at right angles, and probably divided the town into four main quarters.

The Highway Act 1835 defines a highway as " shall be understood to mean all roads, bridges, carriageways, cartways, horseways, bridleways, footways, causeways, churchways, and pavements ".

Also under this project, six small causeways across the canal would be reconstructed into single-lane bridges

To facilitate the defence, the important islands on the western edge of the atoll would be linked by a light railway across causeways built up between the islands.

Furthermore, the crossings had to be held, undamaged, so as to serve as causeways from the beach landing areas, when the Allies moved forward.

Multiple causeways stretching over, connect Manama with Muharraq Island, and another bridge joins Sitra to the main island.

Some of these causeways go east to the Caribbean coast, and the longest runs over westwards to the site of Yaxuna.

The route heads along two causeways, ending at the foot of the John F. Kennedy Memorial Bridge over the Intracoastal Waterway in Egg Harbor Township, where the state turns maintenance back to Atlantic County as County Route 629 to Longport.

They were to seize causeways and bridges over the Merderet at La Fière and Chef-du-Pont, destroy the highway bridge over the Douve River at Pont l ' Abbé ( now Étienville ), and secure the area west of Sainte Mère Église to establish a defensive line between Gourbesville and Renouf.

The site comprises a road network with over 500 cobblestone causeways, more than 3, 000 individual patios, residences, 24 ball courts and an elaborate acropolis with multiple ceremonial buildings and temples.

For 2 weeks Surrounded Islands spreading over was seen, approached and enjoyed by the public, from the causeways, the land, the water and the air.