Quite simply, a divided highway is a highway that's divided or separated by a median between each opposing side of travel. Most divided highways (also known as a 'dual carriageway' in other parts of the world) have at least 2 or more lanes on each side. These are then separated from the opposing direction of travel with a barrier in the middle. Often, the barriers can be seen as concrete dividers, metal guardrails, or a small strip of grass. Be wary of the divided highway sign, warning motorists that there's to be a separation on the road ahead.