Streets. Any streets proposed for the development may be public or private; however, all private streets shall be constructed to City standards and adequate provisions shall be made in the Covenants, Conditions, and Restrictions (CC&Rs) to ensure adequate maintenance. The standards for any on-site improvements (streets, walks, drainage, and utilities) for a project subject to the PD Overlay District may be modified by the City upon recommendation from the engineering or planning departments. Street design shall relate to the function of the street and, for good cause, street widths may be reduced. Innovation in street and walkway design, with an emphasis on connectivity through the development, and reduction of grading for streets is encouraged. Vehicular access to individual lots or units shall generally be only from project streets.