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 X. Provision for public utilities.

The erection of electric light, power, and telephone poles and the construction of underground. utilities shall be restricted on urban sections of the system as hereinbefore recommended for rural sections of the systems.

Where underground utility lines, which require regular and not infrequent maintenance, repair, and replacement, cross urban sections of the system they shall be placed in service tunnels under the pavements to insure continuous and undisturbed operation of traffic on the interregional highway.