Corner lots carry real tradeoffs alongside the benefit. Extra frontage can mean easier access and a slightly larger buildable footprint in some zoning, but it also usually means an extra sidewalk to clear, a second boulevard to maintain and, on some lots, a reduced side yard for parking or a fence.
Main-road exposure is the more consistent discount of the two, because the problem is constant rather than occasional. A house backing onto a collector or arterial street inside the City of Saskatoon deals with traffic noise at all hours, and buyers factor that into an offer even when the house itself is in excellent condition and a recent home inspection, typically $400 to $600, turns up nothing wrong with the structure itself.
Neither effect shows up in an automated estimate, which reads the address and the lot dimensions but not what it actually feels like to stand in the front yard at rush hour. Get your hand-reviewed valuation from Joel Dyck.