On the wiki page for Canadian road classification, it specifies that secondary roads should be multilane/divided and have higher speed limits than surrounding roads. Since this road is multilane and has a speed limit of 50 kph (10 kph higher than other nearby tertiary roads), I chose to upgrade the road to secondary. Also, there are a slew of businesses along the road, indicating that it has a higher traffic volume than surrounding roads.

Wiki page: https://wiki.openstreetmap.org/wiki/Canada/Tagging_guidelines/Road_classification#Secondary