Several people have been discussing tricycles lately. In some ways they seem appealing, but I wonder about their safety in terms of the extra width. When riding on a bicycle, you can ride on or slightly to the right of the outside lane marker, so the width of your body is only partially in traffic. With a tricycle, it would seem you stick out into traffic much more. Others say that they skid before the limit is reached, but I find that I lift a wheel first.
Visibility is a problem.
I think that it isn't just a question of not being seen, it's also something like 'not being seen as a hazard'. My LWB Peer Gynt attracts an order of magnitude more attention, and I don't believe thats just because it is taller. I second the problems of having three tracks - both avoiding bad road spots, and the lean problem are irritating. I get more punctures on the trike, and I've had one or two very near misses with the kerb at speed. Overall, I think that the main advantage of the trike is that it gives you the ability to concentrate on producing power without having to worry about balance - ideal if you have a full fairing, for instance.