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A tricycle, often abbreviated to trike, is a human-powered (or gravity-powered) three-wheeled vehicle. Some trike tricycles, such as cycle rickshaws (for passenger transport) and freight trikes, are used for commercial purposes, especially in the developing world, particularly Africa and Asia.
TYPES OF TRIKE

Upright;- Upright resembles a two-wheeled bicycle, traditionally diamond frame, or open frame, but with either two widely spaced wheels at the back (called delta) or two wheels at the front (called tadpole). The rider straddles the frame in both delta and tadpole configurations. Steering is through a handlebar directly connected to the front wheel via a conventional bicycle fork in the delta, or via a form of Ackermann steering geometry in the case of the upright tadpole.
Recumbent;-Recumbent trikes advantages (over conventional trikes) include stability (through a low center of gravity) and low aerodynamic drag. Disadvantages (compared to bicycles) include greater cost, weight, and width. The very low seat may make entry difficult, and on the road, they may be less visible to other traffic.
Special purposes;- Some tricycles are designed for load carrying. Others are designed for racing or for comfort. Some recumbent tricycles are fully enclosed for all-weather use as well as for aerodynamic benefits; these are known as Velo mobiles. Some are designed to transport children.
Tilting;- Tricycles have been constructed that tilt in the direction of a turn, as a bicycle does, to avoid rolling over without a wide axle track. Examples have included upright, recumbent, delta, and tadpole configurations.
Braking;- Some trikes use a geometry (also called center point steering) with the kingpin axis intersecting the ground directly ahead of the tire contact point, producing a normal amount of trail. This arrangement, elsewhere called zero scrub radius is used to mitigate the effects of one-sided braking on steering. While zero scrub can reduce steering feel and increase wandering it can also protect novices from spinning out and/or flipping.
ADVANTAGES

You don t have to put your feet down when you stop. You can take a passenger without fear that you will tip over the bike and spill the passenger into the road.
You can take the trike down a dirt or gravel road with ease. You won t get fatigued in stop and go traffic.