What is the preferred depth of a central refuge island on a carriageway?

The preferred depth of a central refuge island on a carriageway is typically 2 meters. This dimension is widely recognized in traffic design and safety guidelines as it provides sufficient space for pedestrians waiting to cross the road. A depth of 2 meters allows for adequate accommodation of individuals and groups, ensuring their safety while waiting for a safe opportunity to cross.

Central refuge islands serve multiple purposes, including facilitating pedestrian movements and enhancing visibility for drivers and pedestrians alike. A depth of less than 2 meters might not provide enough protection for pedestrians, while a depth exceeding this may unnecessarily occupy road space and complicate traffic flow. The standard of 2 meters strikes a balance between usability and safety, making it the most accepted measurement in urban planning and traffic management scenarios.