Crusher,
Slow as she goes, Tell your drivers, to slow down, and think about every approach to each delivery site. They might find its better to park in the street, and walk the 100 yards up the driveway to the house, rather than driving up a narrow driveway of 5" virgin powder.
It has been snowing in my neck of the woods this thanksgiving. Some of my drivers have 4 x 4, but most of them just have Front-wheel drive with a good pair of all-season radials with studs. If your drivers aren’t confident snow drivers, don’t send them out in it, you will only send them packing, the confident snow drivers will earn substantial tip incomes, and the rest won’t. If you don’t have any drivers who will drive, make sure to field each call with and apology, and get addresses to send out sorry cards(a postcard with a $5.00 discount or something free on it). There is a good chance your customers, may hang up with you after being denied, and they will call your competition. Hopefully, they have a terrible experience with your competitor, and come running back when the weather is better, but you never know. So its best to gather there info, and send them some kind of appology letter, in hopes of retaining them for future deliveries.
Offer discounts for Carryouts, and Dine-ins, during the inclement weather. Be sure to give the customer, better approximations of delivery times before taking the orders, so as to reduce the number of inbound phone calls, and keep lines free for new orders.