(a) is constructed according to a plan approved by an engineer,

(b) has the load capacity conspicuously posted 30 m from both ends of the bridge, and

(c) has a warning sign conspicuously located 90 m from the bridge if the bridge is not visible from that distance.

(a) that is over 1.2 m in height has bumpers at least 250 mm high running the length of the bridge or culvert on both sides,

(b) has a hazard marker located on each corner of the bridge or culvert with the bottom of the marker not less than 1.5 m or more than 2.5 m above the level of the travelled portion of the road, and

(c) has a sign conspicuously located along the side of the road at least 150 m from the bridge or culvert warning of a narrow passage if the width of the bridge or culvert is less than that of the woods road.