Construction Zone

The Construction Zerbies decide to build a water trench right through the middle of town. The problem is, while they are building it, Zerbies still need to drive past. They need to come up with a way that Zerbies can get across the ditch they are digging while the construction Zerbies continue to work. They start by making a bridge out of dirt. This works great for Zerbies who want to cross the ditch, but it makes it hard for the construction Zerbies to drive back and forth. Next they try making a bridge out of logs. The idea is for the Construction Zerbies to go under the bridge, but the ditch isn't deep enough yet for that to work. Strut picks up one end of the bridge so Fill can get to Rex and they realize the solution. A bridge where they take turns! They put it down when Zerbies need to cross, and raise it up when the Construction Zerbies need to go under.