What type of vehicle falls under the definition of a motor driven cycle?

A motor driven cycle is specifically defined to include motorcycles and mopeds, both of which are intended for two-wheeled travel and operate using an engine. A motorcycle typically refers to larger two-wheel vehicles, while a moped is generally a smaller two-wheeled vehicle with a less powerful engine.

The other choices do not accurately capture the definition of a motor driven cycle. For instance, the definition does not hinge on the horsepower of the motor exceeding five brake horsepower, nor does it restrict the engines to below a certain size like 50 cubic centimeters. Additionally, a vehicle with unlimited horsepower is not a category applicable under the specific laws governing motor driven cycles, as there are established limits for various categories of vehicles. Therefore, the inclusion of both motorcycles and mopeds clarifies the broader classification embodied by the term "motor driven cycle."