What is meant by this sign on or near a bridge?

Stop at all times before crossing the bridge and only give
way to pedestrians who may be crossing
Slow down and be prepared to give way to
vehicles travelling in the opposite direction
Do not overtake a vehicle travelling in the same direction
Explanation: Give way means to slow down and, if necessary, stop in order to prevent a crash from happening. You must always give way at a give way sign and check it's safe to continue. Give way signs are placed at intersections and other places where other vehicles have priority.

