If you’re getting your own signs made, include the relevant regulation. That’s what municipalities do to make prosecutions easier. Can’t claim ignorance or confusion about province to province differences, if you’re given the source document to refer to.
Example:
No Trespassing
Enforced under the Ontario Trespass to Property Act, R.S.O. 1990, c. T.21
Also, make sure you look at the spacing requirement in your province. For instance, in Ontario signs must be posted “so that a sign is clearly visible in daylight under normal conditions from the approach to each ordinary point of access to the premises to which it applies”
Good advice! This is what construction companies do for new building sites, obviously they lawyered up so take advantage of the example. Sounds more official as well.