Tricycle vehicle having a swivel wheel and a cart

1. A tricycle having a cart, comprising:

a riding module comprising:

a front wheel having a front wheel axis;

a pair of pedals, each pedal configured to rotate said front wheel;

a head tube;

two non-continuing recessed members, each in the form of an arch having two ends, substantially in a perimeter of said head tube;

a guide configured to rotate within said recessed members and which is limited by said two ends of each recessed member;

a pressure transferring element, coupled to said guide, for pushing said guide into one of said recessed members;

a seat;

a frame, configured to support said seat, and to support said head tube;

a fork, having a stem, and having at least one blade configured to support said front wheel in a manner permitting said front wheel to rotate about said front wheel axis;

a steering assembly, having a rider handle, configured to turn said fork about a stem axis, said rider handle, having a rider steerable mode, being configured to be rotationally coupled with said stem in a manner permitting a tricycle rider to exert forces on said rider handle and thereby turn said fork, and said rider handle having an external steerable mode, being configured to be rotationally uncoupled from said stem, preventing forces on said rider handle from turning said fork; and

a cart module comprising:

two wheels;

a parental handle for moving said cart module;

a body configured to carry a bag;

a base having a base frame; and

an attaching assembly capable of coupling to said riding module.

2. The tricycle of claim 1 wherein the cart module is foldable.

3. The tricycle of claim 1 wherein the cart module can be disconnected from said riding module.

4. The tricycle of claim 3 wherein the disconnected cart is carryable.

5. The tricycle of claim 1 , wherein the fork includes two blades configured to rotatably support the front wheel therebetween.

6. The tricycle of claim 1 , wherein the rider handle is configured to be uncoupled from the stem via a manually activatable release mechanism.

7. The tricycle of claim 6 , wherein the rider handle is configured to be coupled to the stem via a snap-in-place mechanism.

8. The tricycle of claim 1 , further comprising a coupling mechanism for permitting an operator to selectively couple and uncouple a rotational connection between the rider handle and the stem.

9. The tricycle of claim 8 , wherein the coupling mechanism is configured such that in the external steerable mode, the rider handle is freely rotatable independent of the stem, and in the rider steerable mode the rider handle is coupled to the stem for rotation with the stem.

10. The tricycle of claim 1 , wherein the stem has a minimum diameter that is at least three times smaller than a width of the front wheel.