I've been commuting on various recumbents for about four years. All of mine have been short wheel base bikes with 20" wheels all round. My commute is only 7.5km each way though.
I haven't had a problem with traffic seeing me on a recumbent. Or rather the traffic takes about the same amount of notice of me whatever bike I ride. I have found that I have had to take more care nosing out into intersections to make sure that I can see clearly before I go.
I have thoroughly enjoyed using my recumbents for commuting and touring. The lack of upper body pain or stress is very nice as is the looking up around you.
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Get a bicycle. You will not regret it if you live. ~Mark Twain, "Taming the Bicycle"
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