Detailed utility layouts, specifications and cross sections (sewers, water, gas, electric, telephone, etc.) showing feasible connections to any existing or proposed utility systems; provided, however, that detailed layouts of gas, electric and telephone lines are not required. An indication of these on a typical road cross section shall be sufficient. Layouts shall include proposed locations of streetlights and fire hydrants. If private utilities are proposed, they shall comply with all local, county and state regulations.