Question

Chapter - Pressure
Bridges have larger foundation at pillar levels . ​

Answer 1

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When bridges requiring piers are built over a body of water, foundations are made by sinking caissons into the riverbed and filling them with concrete. ... In the case of suspension bridges, towers are built atop the caissons. The first suspension-bridge towers were stone, but now they are either steel or concrete.

Answer 2

Bridges built on single or pairs of very large concrete piles or pillars, the square structure may be a barge fender or barrier to prevent ships from clipping the supporting pillars.  Pillars or piling are then place on top of this footing to support the bridge superstructure.