(a) It shall be unlawful to operate a vehicle in excess of the speeds listed below upon the streets or portions of streets of the stale highway system listed in each designated appendix hereby made a part hereof:
(1) Twenty miles per hour (appendix I, section 105)
(2) Twenty-five miles per hour (appendix I, section 106)
(3) Thirty miles per hour (appendix I, section 107)
(4) Forty miles per hour (appendix I, section 108)
(5) Forty-five miles per hour (appendix I, section 109)
(6) Fifty miles per hour (appendix I, section 110)
(7) Fifty-five miles per hour (appendix I, section 111)
(b) It shall be unlawful to operate a vehicle in excess of the speeds listed below upon the streets or portions of streets, not a part of the state highway system, listed in each designated appendix, hereby made a part hereof:
(1) Twenty miles per hour (appendix I, section 112)
(2) Twenty-five miles per hour (appendix I, section 113)
(3) Thirlv miles per hour (appendix I, section 114)
(4) Thirty-five miles per hour (appendix I, section 115)
(5) Forty-five miles per hour (appendix I, section 116)
(6) Fifty miles per hour (appendix I, section 117)
(7) Fifty-five miles per hour (appendix I, section 118)