Yeah, I got the same thing driving on either side of T-Bay. On the west side, it was dark and I'd been driving for 16hrs, so I was just out of it and driving like normal... for Alberta... they frown on 120km/hr. Then 11 hrs later, after I slept in the truck, I get a ticket on the east side in the exact same situation as yours... I was PISSED, and I proceeded to do the speed limit exactly, which made everyone behind me mad too since there's no place to pass on that highway.
At least both officers gave me a break and only charged me with 10 over, not the 30 I was doing, guess they took pity on a university student moving out east.