What event foreshadowed the accident in The Sweet Hereafter?

In "The Sweet Hereafter," the accident is foreshadowed by the unsettling scene of a school bus struggling to navigate a treacherous road, highlighting the hazardous conditions that the characters face. Additionally, the ominous atmosphere surrounding the community, marked by a sense of impending doom and the characters' reflections on their lives, creates a foreboding sense that tragedy is imminent. These elements set the stage for the catastrophic event that profoundly impacts the town and its residents.