We are a Singaporean family, have never driven in snow. We are leaving Las Vegas 23 Dec 2007 after spending a week there and Grand Canyon. I would like to drive from Las Vegas on 23 Dec and reach San Francisco 25 Dec, hopefully seeing the giant Sequoia trees in Sequoia National Park and Big Sur along the coast. However we have never driven in snow as we are from the equator and we are not sure if it is a good idea for us to do this (I read that we need chains, have no idea what this entails). Also we do not know if time permits us to do this itinerary, as we plan to drive only during daylight. Your advise will be greatly appreciated. Also what is the best route if it is an okay plan. Thanks.