I have not been asked with my Tavor, but I was given an attempted lecture years ago with my AR180B, gun rack, having a gun at night, etc. After a polite lesson on the transport laws, the local officer has never bothered me as she knows I'm far more knowledgable than her on firearms laws.
I was pulled over one day in November, around 3:00AM, 20 feet from my house. The Tavor was laying across the front seat in plain view. Amongst other standard questions, I was simply asked if I was out hunting. I replied no and nothing more was said about it. In my small town you will almost always get pulled over at 3:00 AM as there are usually only two things you can be up too. Coming from or going to work, and drunk driving.