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Cities in regions with heavy snowfall must clear roads quickly after a storm to keep emergency vehicles, buses, and commuters moving, and many maintain detailed priority routes that determine which streets are ploughed first. Main arterial roads and routes to hospitals are typically cleared before residential side streets, a policy that occasionally frustrates residents whose own streets remain snow-covered for a day or more. Rock salt remains the most common de-icing agent because it is inexpensive, but it accelerates corrosion of vehicles and infrastructure and can harm roadside vegetation, prompting some cities to trial alternatives such as brine solutions applied before a storm arrives. Pre-treatment with brine reduces how firmly snow bonds to pavement, making subsequent ploughing considerably more effective.