Modular recumbent vehicle

A modular recumbent vehicle comprising:

• at least two identical straight cross elements arranged parallel to each other and disposed at longitudinal positions, horizontally and perpendicular to direction of driving, wherein the length of each of said cross elements is variable and wherein each of said cross elements includes a left portion, a right portion and a middle portion;
• a left module having a longitudinal left frame, a left wheel being rotatably mounted to said left frame and at least two clamping devices mounted to the left frame at longitudinal positions identical to the longitudinal positions of said cross elements, wherein each clamping device is attachable to and detachable from a corresponding cross element such that said left module can be attached to and detached from any position within the left portion of the cross elements;
• a right module having a longitudinal right frame, a right wheel being rotatably mounted to said right frame and at least two clamping devices mounted to the right frame at longitudinal positions identical to the longitudinal positions of said cross elements, wherein each clamping device is attachable to and detachable from a corresponding cross element such that said right module can be attached to and detached from any position within the right portion of the cross elements;
• at least one middle module having a longitudinal middle frame, a seat mounted to said middle frame and at least two clamping devices mounted to the middle frame at longitudinal positions identical to the longitudinal positions of said cross elements, wherein each clamping device is attachable to and detachable from a corresponding cross element such that said middle module can be attached to and detached from any position within the middle portion of the cross elements;
• at least one additional module for performing one of the following additional special tasks:
• transportation of passengers, transportation of goods, using additional drives and using additional conveniences;
• wherein said additional module has a frame and at least two clamping devices mounted to said frame at longitudinal positions identical to the longitudinal positions of said cross elements, and wherein each clamping device is attachable to and detachable from a corresponding cross element such that said additional module can be additionally attached to and detached from any position within any of the middle, left and right portion of the cross elements, and wherein said additional module is one of the following:
• a passenger stand-seat, a child seat, a child cabin, a child pedal drive, a pet cage, a shopping box, a carriage platform, an electric drive, a sail, an aerodynamic shell, a canopy, and a travel box;
• and
• at least one intermediate shaft operatively connecting two modules, wherein said intermediate shall has a first end and a second end, said first end operatively connected to either the middle module or the additional module and said second end operatively connected to either the left or right module for transmitting rotation from either the middle module or the additional module to either the left or right module.