What is the safest type of bridge?

What is the safest type of bridge, given the variety of designs and materials available? Is it a suspension bridge, which relies on cables to support its deck, or a truss bridge, which utilizes a series of interconnected beams? Perhaps a concrete arch bridge, known for its strength and durability, is the most secure option. Or, could a moveable bridge, such as a drawbridge or a swing bridge, provide the greatest safety in certain situations? What factors should be considered when determining the safest bridge type, including load capacity, weather conditions, and maintenance requirements?