I didn't find it. I think the regulation is federal, and I did find some information in that yellow lights at the outer most part of the vehicle, but I couldn't tell if it was talking about the cab roof? I am pretty sure it is yellow/amber on the roof, but not sure how many you can put on. I was thinking 3 towards the middle and two towards the edges, one in the middle and one toward each edge, but I don't know what's legal.
I emailed Transport Canada, but got a generic "we got your letter, but can't reply to each inquiry" type letter, but I also emailed the BC Transportation Ministry also. It was less successful. I got a "undeliverable" message and I used a direct link from their website. LOL...
