thank you for the help so far !
the sign was white and appeared before the roundabout
I measured the distance using google maps and from the roundabout to where the cop would have saw me is 916m
if you refer to my diagram, I was dinged going 93 in a 60 at the location of the yellow star. I was under the impression that after the roundabout it went back to an 80 zone


edit: other useful information added

I am struggling to find any information on what the laws are regarding traffic signs, specifically signs with posted speed limits. Any links would be extremely helpful ! Now to my story: At the time of when my ticket was issued, the road recently finished construction for a roundabout and the signage for the first little while was a total mess. I posted a diagram in hopes of better illustrating the metrics. The road is generally an 80km/h zone(red line). Approaching the roundabout heading south, there is a sign with a posted 60km/h(blue line). After the roundabout, there were zero traffic sign...