I carry a folding knife. When I walk at night I also use a cane or walking stick (Bo Staff). My knees aren't in great shape so it serves a dual purpose.
In your vehicle you could carry a hammer, claw gardening tool, and a baseball bat without too many questions being asked. Put a baseball glove with a ball in it in the car to make your story more believable. If questions are asked, these are all things you can justify. Do not use the word "weapon" with any authority types.