Minecraft: 2-lane, 4-way automated roundabout rail junction
Channel: Ron Swanson
Date: 2011-12-04

This is my solution for merging two lanes of traffic from four directions without anyone colliding. Even empty carts circulate independently. Once you're in the roundabout, at each exit, you pause to choose the exit or automatically continue forward.

Made with Minecraft 1.0 - using Optifine mod and customized Dokucraft textures.