From Facebook group Illinois Botany. This is fascinating to trace the parallels of logistical maps of today of this region. From game trail to slingshot cloverleaf ramp complex interchange from the state toll road to the interstate highway, along railway lines. It's no coincidence those economic ecosystems developed geographically along the same lines nature pioneered. Toll-road grades over railyards next to refineries and waterways. Originally plank roads and canal towpaths for mules. Why Waukegan and Romeoville and Elgin etc are logistical points.