Monarch Pass, Colorado, USA: It’s nice to know there is a place for out-of-control semis to go, but there’s something a bit unsettling about seeing a sign like this. First of all, there is a reason for a runaway truck ramp — because there are runaway trucks. Secondly, a lot can happen in two miles when a truck has brake failure — especially on a narrow mountain pass with one side that drops off substantially.