• Cranes are almost always present in bridge, viaduct, culvert and in-stream projects, so their dangers are ones everyone has to stay aware of.
• One of the biggest risks for lifting and digging equipment is electric lines, and gear need not always touch them for power to arc.
• Have all utilities marked before anyone digs, and then do not assume pipes and wires are exactly where they're supposed to be.

From the video:

This video covers typical, obvious and not-so-obvious hazards around the construction of bridges and culverts, with emphasis on falling, falling objects and crane hazards.