I always make sure that I have sneakers (summer) and insulated boots (winter) in my vehicles when I am away form home. Also socks, jeans, a hooded goretex jacket and in winter heavy duty gloves, a bomber style hat, and my winter weight Carhartt coat. Sometimes you are just not otherwise dressed properly for a long walk. For example last night I had a meeting in MA and was wearing a sports coat and tie and dress shoes, but I had what I needed in the truck in case I had to walk home. I also keep $500 – $1,000 cash in the truck just in case I need it.