For your comfort and safety you should carry an emergency road kit. This kit should be stored in the trunk or cargo space of your vehicle and should include:

ice scraper
snow brush
shovel
sand, salt or kitty litter
booster cables
flashlight
blanket
reflective warning sign or road flares
warm gloves
extra clothing and footwear
emergency food supplies
axe or hatchet
matches
candle in a deep tin
fire extinguisher
paper towels or rags
First-aid kit
compass
road map