To ask the Secretary of State for Transport what assessment her Department has made of the impact of speed humps on ambulances; and if she will make a statement. (151897)

The Department has commissioned extensive research into the development of traffic calming technique. This research covers the impacts of road humps on vehicles, including ambulances, and their occupants. As a result, the Department recommends the use of 75 mm high (instead of the 100 mm maximum height permitted under regulations) road humps with shallow gradients, or speed cushions, where emergency services may be expected to pass on a regular basis.