on bass guitars, its really not recommended - but i've done it (in NY) literally countless times and never had an issue.
I had a martin mahogany acoustic guitar develop a rib crack after being in the car for 30 minutes on a 50 degree day once though... so it depends on the instrument - obviously acoustic instruments are way more delicate in this sense.
I had a martin mahogany acoustic guitar develop a rib crack after being in the car for 30 minutes on a 50 degree day once though... so it depends on the instrument - obviously acoustic instruments are way more delicate in this sense.
