Sounds like you want a Twike. Seriously, though: I know this isn't what you want to hear, but.. just learn to ride a bicycle. If ice really scares you get studded tires. Trikes are large and cumbersome and IMO defeat alot of the advantages of bicycle commuting(maneuverability in tight spaces, can be carried up stairways or through doorways, easy to lock up if need be...)also three flat tires is a bit harder than two to fix.I know someone who decide they "couldn't" use a bike, so ended up with a trike- that thing was like an albatross around their neck i.e. ridiculously heavy and hard to get up hills, so they ended up walking around pushing a trike. Hope this perspective helps..