Only take buses early in the morning when the drivers are "fresh" because these guys drive up to 18 hours a day - and for only $300 a month. They speed and take suicidal chances on mountain passes, and the buses are unsafe and overcrowded. Taking an overnight bus is sheer insanity.
Most importantly, don't get on the dangerous bus-trucks - you'll have to guard against that major mistake. If it idles like a bus-truck and it sits like a bus-truck, and it stops like a bus-truck, it ain't a bus! Be careful! This is a photo of a bus-truck that I took in Colombia and it almost cost me my life.
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