Unleash your inner Norse god while driving one of these scenic winter routes. On the spectrometer of thrills, winter driving lies somewhere between utilitarian necessity and white-knuckle extreme sport. But now that gas is affordable and holiday lights are twinkling from the East Coast to L.A., it’s time to hit the open road and give the ultimate test to your car’s pimped-out winter extras—heated steering wheel and front seats, windshield wiper de-icers, snow tires and all-wh