The Honda ST1300 Pan-European was the most popular bike, but it was withdrawn from service by most forces in 2007, following the death of a Merseyside police motorcyclist in 2005 in an accident caused by an instability in the model when outfitted with police equipment. Police vans, such as the Ford Transit, Vauxhall Movanos or the Mercedes-Benz Sprinter, are widely used across the United Kingdom and incorporate a cage to hold prisoners. Although in the United States it is usual to carry a prisoner in a police car, some British forces do not permit this, as most police cars have no barrier between the front and back seats to protect the officers. Each police force has different policies on prisoner transportation. Some allow compliant prisoners to be transported in response cars, ensuring that one officer sits in the rear with the prisoner, and the prisoner sits behind the passenger seat. Larger vans are also used to act as mobile control room at major incidents, and may also carry specialised equipment such as hydraulic door entry and cutting tools. Minibuses are used to carry groups of police officers, for example to public order and major incidents, and for inner-city patrols. One notable example is the Mercedes Sprinter used by the Metropolitan Police's Territorial Support Group. Other public order minibuses include the Vauxhall Movano and the Iveco Daily. They are usually fitted with riot shields to protect the windscreen from damage. More recently, as a result of reenforced glass being used, public order vans are not fitted with cages over the windscreen. Almost all police forces use the battenburg livery of yellow and blue checks for their vehicles, on top of a white, blue, or silver base vehicle colour. Silver became popular in some forces because of the higher resale values when sold. Most cars use retroreflective livery on the sides and red and yellow chevrons on the rear. Most also carry slogans, the force crest and contact information. Most police cars, vans and minibuses have aerial roof markings that help aircraft crew identify them. These can include the unique force code, vehicle identifying mark, or police division that the vehicle belongs to. Under the Road Vehicle Lighting Regulations 1989, police vehicles may display blue flashing lights to alert other road users to their presence or when the driver feels that the journey needs to be undertaken urgently. These lights are usually mounted on the roof and incorporated into the standard vehicle system of external lights. Most police vehicles are also fitted with a siren.