What is the maximum height from the lowest point of a dropped curb to the gutter of the carriageway?

The maximum height from the lowest point of a dropped curb to the gutter of the carriageway is established to ensure safe and accessible transitions between walkways and roadways. A height of 25 mm is considered optimal as it allows for efficient drainage while ensuring that individuals, particularly those with disabilities, can easily navigate the transition from the sidewalk to the roadway.

This height specification is based on practical considerations for pedestrians, including those using wheelchairs and other mobility aids. A 25 mm threshold helps prevent water pooling and reduces the risk of trip hazards, while also maintaining the structural integrity of the curb.

Choosing a height that is higher than 25 mm could pose challenges for safe access, while a lower threshold may compromise drainage effectiveness. Therefore, 25 mm represents a balance between safety, practical use, and municipal regulations.