Additional bridges not only increase the cost of the interchange, but also its size. To allow for a 5 m vertical clearance for the bridge, you will also need ap

Additional bridges not only increase the cost of the interchange, but also its size. To allow for a 5 m vertical clearance for the bridge, you will also need approach and exit ramps. If your maximum allowed design slope is 5%, you will need 100 m ramps at each side of the bridge, increasing the size of the interchange by 200 m.