London's Calling.......bicyclists
from Grist:
Those lucky jerks in London are getting a frickin’ bicycle highway
By Sarah Laskow
London may be the world’s newest best cycling city. Mayor Boris Johnson has announced that the city will be spending a whopping $1.51 billion on better bike infrastructure — including a 15-mile bicycle highway that will connect the west and east sections of the city.
There are, oh, a gabillion reasons why this is a great idea. But here are the reasons Johnson gave for spending all this money on cycling:
The reason I am spending almost £1 billion on this is my belief that helping cycling will not just help cyclists. It will create better places for everyone. It means less traffic, more trees, more places to sit and eat a sandwich. It means more seats on the Tube, less competition for a parking place and fewer cars in front of yours at the lights. Above all, it will fulfill my aim of making London’s air cleaner.
Besides the highway, there will be more fully- and semi-segregated bike lanes pretty much everywhere in the city. Johnson says he’s not promising that London “will become Amsterdam any time soon.” But no one needs London to be Amsterdam. It just needs to be its big, old, messy self — with more bicycles.
http://grist.org/list/those-lucky-jerks-in-london-are-getting-a-frickin-bicycle-highway/
= new reply since forum marked as read
we refer to them as cyclists : not bicyclists. 
More here : http://www.guardian.co.uk/lifeandstyle/2013/mar/07/london-network-bike-routes-cycling
Given they're only referred to as cyles or bikes I assume they include tricylces too. 
Thus to differentiate between the two, people have invented new terms. For example many states in their traffic laws refer to bicycles as "Pedacycles" thus they include three and four wheelers provided the only propulsion system is done by some sort of manual effort (which can include the use of the arms).
Hand powered tricycle:
http://www.freedomryder.com/
Thus a lot of people are using the term "Bicyclist" to separate people who ride a bicycle propelled by manual propulsion as opposed to a person on a Motorcycle, that is propelled by some sort of engine.