1, 2, and 3 are all okay. " The word "over" acts like an intensifier to emphasize the you are to go over the bridge.
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Shinjiconfused by the use of the word "cross"There is the implication of a passageway that goes over something when you think of a bridge, so it is natural to include the word "over" even though you don't have to. But a street or road is flat against the surface of the ground; these structures are not elevated. So we would more naturally say "cross t