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In the Middle Ages the narrow doors in the city walls also enabled late arrivals to gain entry after the main gates had been closed. [ 1 ] If the small entrance in the door of a large gate has a high threshold , it may be called a manway.
A worn-out wooden threshold. A threshold is the sill of a door. Some cultures attach special symbolism to a threshold. It is called a door saddle in New England. [citation needed] Door thresholds cover the gap between the floor and the door frame, helping to prevent any water leaks, insects or draughts from entering through the opening.
The door frames are usually very plain, but sometimes beading is used to decorate the frame. Coats of arms and the year of construction date to no earlier than the Late Middle Ages. Wooden entrance doors were sometimes clad with iron or slate in order to reduce the risk of fire. Original doors from the Middle Ages have rarely survived however.
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Entrance to HM Prison Edinburgh. A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.
The cloverleaf interchange between US 131, M-6 and 68th Street in Cutlerville, Michigan, United States, shows many of the features of controlled-access highways: entry and exit ramps, median strips for opposing traffic, no at-grade intersections and no direct access to properties.
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