A dual carriageway is a type of road that has two separate lanes for traffic moving in opposite directions. Each direction is usually divided by a central reservation or barrier, which enhances safety by preventing head-on collisions. These roads are designed to accommodate higher speeds and often have multiple lanes in each direction. Dual carriageways are commonly found in many countries, including the United Kingdom and Australia. They are typically used for long-distance travel and can connect major cities or regions. Drivers must follow specific rules, such as using the correct lane and observing speed limits, to ensure safe travel.