PG13 said "one of the first things you learn driving is unless posted , the speed limit urban is 50 , until a sign says otherwise. Thus when you get north of the bridge there is a 70 sign , that is when you can speed up... "
I went of Google Earth Street View and found that sign. This one was on 1st North by the Petro Can. And on Page 57 of the Manitoba Drivers Handbook has this.
'Speed
A safe speed allows you to stop safely in emergency situations. Unless
otherwise posted, the maximum speed limit is 90 km/h in rural areas and
50 km/h in urban areas. Poor driving conditions will require you to drive
more slowly. At no time should you exceed the posted maximum speed limit.
Driving safely can also mean not driving too slowly. You should not drive
at such a slow speed that you hold back or block the normal and reasonable
flow of traffic. '