No person shall drive a vehicle on any public bridge or elevated structure at a speed which is greater than the maximum speed permitted under this chapter on the street or highway at a point where said street or highway joins said bridge or elevated structure, provided that if the maximum speed permitted on said street or highway differs from the maximum speed on any other street or highway joining said bridge or elevated structure, then the lowest of said speeds shall be the maximum speed limit on said bridge or elevated structure, subject to the following:
The department upon request from any local authority shall, or upon its own initiative may, conduct an investigation of any bridge or other elevated structure constituting a part of a highway, and if it shall thereupon find that such structure cannot with safety to itself withstand vehicles traveling at the speed otherwise permissible under this chapter, the department shall determine and declare the maximum speed of vehicles which such structure can withstand, and shall cause or permit suitable signs stating such maximum speed to be erected and maintained at a distance of two hundred feet before each end of such structure.
No person shall drive a vehicle over any bridge or other elevated structure constituting a part of a highway at a speed which is greater than the maximum speed which can be maintained with safety to such bridge or structure, when such structure is signposted as provided in this section.
Upon the trial of any person charged with driving a vehicle at a speed which is greater than the maximum speed which can be maintained with safety to such bridge or structure, proof of such determination of the maximum speed by said department and the existence of said signs shall constitute conclusive evidence of the maximum speed which can be maintained with safety to such bridge or structure.
[C39, § 5023.11; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, § 321.295]
Referred to in § 321.285, 805.8(2h)
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