Cold weather changes the stakes of a roadside delay. Your car kit should focus first on visibility, warmth and a safe way to get help.
Stock for the season
Pack gloves, spare warm socks, a blanket, water, snacks, a headlamp, phone power bank and basic first aid. Add a compact shovel, traction aids, reflective warning triangles, scraper and weather-appropriate boots when driving beyond built-up areas. Keep all of this secured so it does not become a projectile.
Choose your safety routine
Let someone know your route before remote travel. Keep fuel or battery range sufficient and monitor official road conditions. If stranded, assess traffic and weather before leaving the vehicle; avoid exhaust blockage and other carbon monoxide risks when idling.
Refresh before winter
Replace depleted batteries, check your booster or jump-start equipment, and inspect any first-aid contents. Reconsider the load if children, older adults or pets often ride with you.