Final answer:
Vehicles must typically be able to clear windows of frost between November 1 and April 1, a timeframe that accounts for the colder winter months when visibility might be impaired due to ice.
Step-by-step explanation:
According to various regions’ road safety laws, there is usually a specified period during the winter months when vehicles must be capable of keeping the windshield, side windows, and rear window clear of frost and ice. While the exact dates can vary by jurisdiction, a common timeframe stipulated in such laws is from November 1 to April 1. This period accounts for the colder temperatures that may cause frost and ice to build upon vehicle windows, impairing the driver’s visibility. Given that the scenario presented suggests an “exceptionally cold” winter, this wider date range would ensure that vehicles are adequately prepared for such conditions.