What are bridges?
"A bridge is a structure built over a river, seas, and so on, that allows people or vehicles to cross from one side to the other."
Bridges are built over various occasions.
Bridges over rivers and valleys
A suspension bridge |
 
A railroad bridge |
A bridge across lakes |
  
A bridge across seas |
The methods of building a bridge also differs according to type of bridge girder.
A girder bridge |
A truss bridge |
ŽÎ’ ‹´ |
A suspension bridge
|
An arch bridge |
"A bridge must be built to be very strong in order to support many people and heavy cars.
There used to be a lot of wooden and stone bridges. But most of the modern bridges are made of concrete.
There are various methods to make a bridge stronger. People chose one according to each situation.
Also, more and more beautiful and artistic bridges are getting built nowadays."
Citation : The article and photos were quoted from p.p. 10-11, Nazenaze
Gakusyu Kodomo Hyakka volume 10, published by Gakusyu Kenkyu-sya in 1987.