Although open to all the world for walking, only royal personages or a few specially favoured people were allowed to drive through. It was one of the grievances of the Duchess of Marlborough when the Duke was in disgrace that the privilege of driving her coach and six through the Park was denied her. The remaining restrictions with regard to carriages have only passed away in very recent years. The notice board stating that Members of Parliament during the session might drive through the Park from Great George Street to Marlborough House was only removed when the road was opened to all traffic in 1887, and Constitution Hill only became a public highway in 1889. The use of the road passing under the Horse Guards' Archway is still restricted to those who receive special permission from the sovereign.