When there is snow in the forecast, we pre-treat Purple Routes (hills, bridges) before the flakes begin to fall. This helps to prevent snow and ice build up on these high hazard areas. We plow Purple Routes within 8 hours of 5 cm accumulation, and then Red Routes (major arterial roads) within 72 hours of 8 cm accumulation.
If the snow keeps falling, we will continuously plow Purple and Red Routes as often as necessary until the snowfall stops. We do this so major roads are drivable and safe but we always remind drivers to drive to the road conditions and stay home if you can until the weather is better.
Blue Routes are Downtown (Snow Zone D) and they are plowed within 4 days of a 5 to 10 cm snowpack (not accumulation). Green and Grey Routes are residential streets and are plowed within 15 days of a 5 to 10 cm snowpack (not accumulation). We call Green and Grey Route plowing Snow Zone plowing. Visit the Snow Zone Plowing page for detailed information on that program.