Water-Powered	"Bi-Fold"	Sliding Roadway
	(Hinged Roadway)
Truss Bridgeg	A truss must remain rigid. movement would need to take place insidethe structure of the truss.The pullys however, could be attached to the structure.	Truss must remain rigid. Movement would take place inside the structure, but pulleys won't be easily attached to the structure.	The truss could be raised to allow this movement
Cable-Stay	Each cable is responsible for it's own weight. but only the furthest part of the road can move because the roadway pushes in on itself near the center.	Each cable is responsible for it's own weight. but only the furthest part of the road can move because the roadway pushes in on itself near the center.	Too much pressure might be put onto one cable.
Arch	The supports that reach to the road can move without harming thestructure. pulleys need to be attached to something other then the structure.	The supports that reach to the road can move without harming thestructure. pulleys need to be attached to somethin other then the structure.	The supports that reach to the road can move without harming thestructure. pulleys need to be attached to somethin other then the structure.
	The arch prototype is too simple to be creative with. However, the cable-stay bridge has good possible outcomes and the arch and truss could be partially used, but their structures need to remain rigid.