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ist a roadway bridge like the Lake Pontchartrain Causeway
That kind of depends on exactly how you define "bridge", but probably China. The Beijing-Shanghai high speed railway has several extremely long elevated sections, the longest of which is the Danyang–Kunshan Grand Bridge, which is over 100 miles long. It's considered the longest bridge of any type in the world, but most of it is NOT over open water (also, it's a railway bridge, not a road bridge), which may exclude it from consideration for you.The longest continuous road bridge over water is the Lake Ponchartrain Causeway in Louisiana across Lake Ponchartrain just north of New Orleans. There causeway runs over water for just a bit under 24 miles, which is long enough that from the center of the bridge you cannot actually see the ground on either end of it due to the curvature of the Earth ; the bridge runs to the horizon and just disappears without a visible terminus.The longest single span (section of roadway between support towers) is the nearly 2 km center section of the Akashi Kaikyo suspension bridge in Kobe, Japan.
Basalt
Balast rock
The giant's causeway in Ireland is primarily composed of a type of igneous rock called basalt.
it is a type that you like
The newest type of bridge is a cable-stayed bridge
A suspension bridge.
beam bridge
It is a suspension bridge.
The Severn Bridge is a suspension bridge.
a type of bridge