They arent used as much because we have new kinds of bridges that may be more efficient and that are stronger
Germany has most bridges
The superlative of efficient is "most efficient."
The most common types of straight bridges used in civil engineering projects are beam bridges, truss bridges, and arch bridges.
Brooklyn bridges most major attractions are during christmas :)
The most common materials used in bridge building are generally steel or concrete for larger bridges, and stone or wood for smaller bridges.
truss bridges are one of the most spaceships in the undergrounds flying
Spur Gear is the most efficient
More efficient and most efficient are the comparative and superlative forms of "efficient".
Most bridges are manmade, built in the location where they are required. Some natural bridges of rock or timber exist in wilderness areas.
Pittsburgh, Pennsylvania holds the record for most bridges in the United States. Pittsburgh has 446 bridges while there are a total of 1900 in Allegheny County. The only city with more bridges is Venice, Italy.
In the colonial days of North America, there were few roads that were safe or reliable, and no bridges to cross the frontier rivers. The most efficient way to transport goods was by boat, and the majority of goods were carried to ports downstream, as it was much harder to travel upriver.