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172 in accordance with an approved development plan. If so used, adequate steps, ramps, or walks shall be provided to give access to such areas from the adjacent service streets or ways, and, if necessary, barriers such as fences shall be provided to prevent pedestrian encroachment on the pavements for vehicular travel.

Adequate crosswalks for pedestrians shall be provided on all bridges and within all underpasses carrying intersecting streets or highways over or under the interregional highway, and steps or ramps may be provided from such bridges or underpasses to give pedestrian access to median strip or border areas capable of safe recreational or other pedestrian use.

In addition to the pedestrian-crossing facilities provided at intersecting streets or highways, special bridges or underpasses for pedestrians shall be provided at such intervals as may be necessary for the convenience of pedestrian crossing of the pavements of the highway.

Paths for pedestrians shall be equal in surface smoothness and accessibility to the surfaces provided for vehicular travel.

''VII. Landscaping.''

On all urban sections of the system the landscaping design shall conform, wherever feasible, to the recommendations hereinbefore made for rural sections of the system.

''VIII. Signs and pavement markings.''

The installation of traffic control signals shall be prohibited on urban sections of the system.

On all urban sections of the system, signs and pavement markings shall be provided as hereinbefore recommended for rural sections of the system, except that speed-control signs shall be used only where the maximum safe speed under normal conditions is less than 50 miles per hour, in which case signs warning of the approach, the presence, and the termination of such sections shall be provided in a manner similar to the recommendations made for rural sections of the system. Where State or local traffic regulations govern the maximum speed, such maximum speed limits shall be indicated at appropriate intervals by signs bearing the legend “Speed limit ——.”

''IX. Lighting.''

All urban sections of the interregional system shall be lighted by artificial fixed-source illumination to provide the maximum degree of safety and convenience of movement at night. At all connections illumination shall be provided for such distance and in such degree as may be necessary to provide a safe transition between the normal system lighting on the interregional highway and the normal degree of illumination on the connecting street. Illumination of the interregional highway shall not terminate abruptly at the limits of urban sections but shall be extended in diminishing degree for such distance as may be necessary to insure safe transition from lighted to unlighted sections or to sections on which the illumination is of lower degree.