Personal transportation device for supporting a user's foot having multiple transportation attachments

A personal transportation system, comprising:

• first and second transportation assemblies, each of said transportation assemblies being operable in a direction of travel and comprising first and second pluralities of wheels, each of said pluralities of wheels being arranged in an in-line configuration aligned along first and second wheel axes, respectively;
• and
• first and second foot platform structures mounted to said first and second transportation assemblies, respectively, each of said first and second foot platform structures including first and second ends, first and second longitudinal axes of each said first and second foot platform structures extending between midpoints of the first and second respective ends of each of said foot platform structures, the first and second longitudinal axes being skewed from the first and second wheel axes, respectively, each of said foot platform structures being sized to support both the toe portion and heel portion of only one of a user's feet, wherein each of said foot platform structures supports a user's foot so that a longitudinal axis of said user's foot can be positioned transversely to said direction of travel of said transportation attachment, and the user employs both of the first and second transportation devices in tandem and provides an oscillating motion for propulsion;
• wherein each of said first and second transportation assemblies comprising an undercarriage including two arms which extend generally parallel to each other but in opposite directions relative to the direction of travel.