Comments on: <![CDATA[Interchange spiral]]> Tue, 02 Jun 2015 14:30:43 +0000 hourly 1 By: H James Lucas Wed, 05 Mar 2014 23:42:03 +0000 This interchange style comes with one big trade-off: Because all the exits come before the entrances, there is no need for entering and exiting vehicles to weave, which is great from an efficiency standpoint. The catch is that a car can’t take two ramps and end up going back in the direction from which it came, which is a pretty essential manœuver in many suburban areas.