Hello, northern neighbors!

This query is not gun related, but I'm at the end of my rope as far as information gathering, and I need some help.

I'm writing a short piece for my employer about the Canadian requirements for marking ground disturbances, dig sites, construction zones, etc., and I haven't found anything besides a few sentences in the Canadian Labor Code that state such sites shall be marked with "highly visible" means. I haven't found any specific information about what materials or colors these "highly visible" means should or can be made of.

Anyone got any info on this subject, or a line on a source I can use to gather the information necessary to finish this write up? Specifically, I'm looking for information on the approved use of marking flags, barricade tapes and other PVC or PE marking products.

Thanks!

DC