Car chanter yes!

I have a car whistle always, one that's all-metal so there's nothing that can melt in our California summers, when temperature inside a parked car can go well over 100 degrees.

I had a plastic Practice Chanter that I stupidly left in the car where the sunlight could hit it, the PC was alright but the plastic reed inside melted!

One big advantage with a car-instrument is having it a bright colour. I have my red Practice Chanter and I used to have a red anodised aluminium MK Low D whistle. Why? Because if you're sitting in your parked car practicing on a black or silver chanter or whistle it can be mistaken for a weapon by police. Sad I know, but it's the world we live in.