it seems to me a vest pipe would be easier to use while driving.
Hey Sparrow, take a look at the Big Ben Barbados line. In particular the bent egg if you're looking for a good driving pipe. Full bent, good size bowl, wide saddle bit, and pretty light and small. I have one and it is one of the best of my pipes for long highway drive as it sits nicely against your chin while hanging loosely from the mouth. It also smokes Virginia really nicely. :puffpipe:
http://www.smokingpipes.com/pipes/new/Big-Ben/moreinfo.cfm?product_id=165920