The following Regulations shall govern street alignment:
(a) Vertical profile grades shall be connected by vertical curves up to twenty percent (20%), but only for short, straight stretches as determined by the County or City Engineer, as the case may be.
(b) Waiver of visibility requirements may be given subject to the approval of the City Planning Commission.
(c) Waiver of vertical curve requirements may be given subject to the approval of the Commission.
(1984 Code Sec. 151.108)