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Cities in snowy regions must clear roads quickly after heavy snowfall to —preventpreventingpreventsprevented traffic accidents and keep emergency services moving. Municipal crews typically spread salt or grit before ploughing, since this prevents ice from —bondingbondbondsbonded to the road surface. Budgeting for snow removal remains challenging, as an unusually harsh winter can —depletedepletingdepletesdepleted a city's annual maintenance funds within weeks.