The city traffic engineer, upon approval of the traffic committee, is authorized to erect or place signs upon any street or adjacent to any street in the city indicating the existence of a bicycle lane and otherwise regulating the operation and use of vehicles and bicycles with respect thereto, so long as the same are consistent with this chapter. Before such a sign is erected, the subject bicycle lane shall be designated on such street by a raised curb, appropriate painting, reflectorized buttons or in such other manner as the city traffic engineer, upon approval of the traffic committee, shall determine will provide sufficient notice of existence of such bicycle lane. When such signs are in place, no person shall disobey the same. Before such a sign is erected or placed, it shall be found by the traffic committee that without the establishment of a bicycle lane separated from a vehicle lane, the public is endangered. (Ord. No. 839, § 5.)