1165.03 ALLEYS.
   (a)   Alleys shall not be used in residential subdivisions except when deemed necessary by the Planning Commission to meet unusual conditions.
   (b)   Alleys are required in the rear of all commercial and industrial lots if no other provisions are made for adequate service access or for parking. The rights of way of such alleys shall not be less than twenty feet and dead-end alleys shall not be permitted.