Designer's guide to Eurocode 1. EN 1991-2, EN 1991-1-1, -1-3 to -1-7 and EN 1990 annex A2 / Actions on bridges :

The design process of a bridge includes several steps. One of the major steps is the determination of actions and combinations of actions. These actions are imposed loads due to traffic climatic actions, actions due to water or soil subsidence construction loads and accidental actions.