Highways, commuters and the daily cycle count
Many Mississauga households commute, using Highway 401, 403 and the QEW, and some use the garage several times a day for school runs and errands. Every trip is one cycle on the springs, and a spring is rated for a limited number of them.
Busy families can reach that limit sooner than they expect. If your door has been in service for many years and gets heavy use, an early spring replacement can avoid a surprise failure. Replacing both springs together is usually wise, since the second often follows the first.

