Heritage chiefs are calling for traffic to be banned from the top of the Royal Mile to protect Edinburgh Castle.
Edinburgh Castle is one of Scotland's leading tourist attractions
John Graham, Historic Scotland chief executive, wants all but essential traffic prevented from going up Castlehill.
He is keen for the move, which would see the top section of the Lawnmarket closed to traffic, to be put into place from next summer.
Edinburgh Council said discussions were ongoing over the proposal.
Curbing traffic levels would help the deteriorating condition of the roadway leading to the visitor attraction.
Under the plans coaches would park in nearby Johnston Terrace with the elderly and infirm being transported the last stretch by shuttle bus.
John Graham, Historic Scotland chief executive, said: "As far as we are concerned the ideal scenario would be for Castlehill to be virtually free of traffic.
"We have restricted access to the esplanade in the last few years and are looking at ways of improving its appearance in the future.
"A lot of tour coaches come into the esplanade, but the idea is to have the coaches park on Johnston Terrace."