According to Google Maps, driving 150 km from the Trans-Canada Highway to Burgeo, Newfoundland takes more than 3 hours on Newfoundland and Labrador Route 480. An old (1989) topographic map shows it as unpaved between Silver Pond and some 10 km north of Burgeo, but judging from Google Streetview, the road seems entirely paved, pretty much straight, and wide enough for two cars to meet. Does this road really allow an average speed of only 50 km/h, or are the driving time estimates for Google Maps here simply wrong?
I found a speed limit sign on the road (street view link) that shows 80 km/h northbound out of Burgeo. There is another one near the junction with the Trans-Canada Highway the other way (street view link). So it seems likely the speed limit on the majority of 480 is 80 km/h.
There's a "moose" sign a little further on, which probably means you want to be careful in any case.