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shall be required along one side of all minor and cul-de-sac streets; however, the agent may reduce or eliminate the requirements on any minor street, as defined in section 33.1-2 of the City Code, or cul-de-sac. The agent must find that such reduction will not create a pedestrian safety hazard. Sidewalks shall be installed in accordance with plans and specifications of the city and must include ramps for wheelchair access at all intersections in accordance with the requirements of the Americans with Disabilities Act and in accordance with any revisions approved by the Federal Highway Administration. (8) Standard city street signs shall be installed at all street intersections. (9) Necessary traffic -control devices, including, but not limited to, traffic signals or traffic signs which are required within the subdivision or adjacent thereto and which are approved by the traffic engineer, shall be installed. (10) Street lights shall be installed by the subdivider in accordance with the standards and specifications approved by the traffic engineer. The subdivider shall pay the cost of installation thereof and all costs to be incurred for the operation and maintenance thereof during the first year following the completion of installation. (11) Bridge widths shall be designed to the ultimate right-of-way width. Sidewalks shall be provided on both sides of bridges unless waived by the city engineer. Timber construction, including timber pilings, shall not be permitted. Bridges shall be designed for H-20 loading (minimum). Architectural and ornamental work on bridges shall be compatible with the area in which the bridge is located and approved by the city engineer. (12) Culverts shall be designed in accordance with the Virginia Department of Transportation design standards and details. Endwalls shall be provided as required by the city engineer and shall conform to Virginia Department of Transportation standards or city standards. The developer shall provide for soil bearing investigations to determine foundation requirements. Pilings for culvert support shall be provided if needed. Ample waterway shall be provided for in culvert design, based on five-year storm recurrence and the drainage area served by the culverts. When requested by the city engineer, the developer shall provide calculations for major culverts and bridge crossings which shall be based on a 25 -year frequency to ensure that no flood hazard will result to the public rights-of-way or to residences or other structures. (13) For the purpose of creating residential lots on existing streets, the planning director may modify or waive the street grading, pavement base, surface and curb and gutter requirements on an existing street constructed without such required improvements if: a. The city has no plans to install such improvements on the street within the next ten years; b. The street is currently improved or will be improved to a standard equivalent to similar streets in the neighborhood; c. After consultation with the city engineer, a determination is made that the street will provide adequate and safe access and drainage to existing and future residents in accordance with the purposes of the subdivision ordinance; and