Section 4173 - Speed and weight limits on elevated structures(a) No person shall drive a vehicle over any bridge or 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 bridge has traffic-control devices displayed.(b) No person shall drive a vehicle over any bridge or elevated structure constituting a part of a highway when such vehicle's gross weight, including carried load, is greater than the maximum weight which can be maintained with safety to such bridge or structure, when such structure has traffic-control devices displayed.(c) The existence of traffic-control devices shall be conclusive evidence of the maximum speed or gross weight, including carried load, which can, with safety to any such structures, be maintained thereon. 21 Del. C. 1953, § 4173; 54 Del. Laws, c. 160, § 1; 57 Del. Laws, c. 670, § 13A; 60 Del. Laws, c. 701, § 45.;