The only time you should carry weapons with you in your car is when you are going to another country.

My dad had an incident way back in 93 when some fellas at some remote gas station in saudia tried to mug him. He pulled out a hunting knife from his car and they backed off. It is always wise to carry a weapon with you.

Its like a condom, rather have it and not use it than need it and not have it.

Locally there no point in carrying either.