fig1 shows in a perspective view an access tunnel system 1 in an exemplary arrangement in front of a vehicle 11 that is a bus 17 such as one used at an airport . the access tunnel system i has an access tunnel 10 that leads up to a node element 12 of the access tunnel system 1 . the access tunnel 10 is formed from a plurality of tunnel elements that are pushed into one another . the tunnel elements 15 lead up to the node element 12 such that a person can move from the access tunnel 10 into the node element 12 without interrupting a shelter . a first access tunnel 13 and a second access tunnel 14 adjoin the node element 12 and are formed from the tunnel elements that are same as the access tunnel 10 . the access tunnels 13 and 14 are lead up to doors 16 of the bus 17 , for example . the node element 12 is designed such that the access tunnels 13 and 14 lead up to the node element 12 at a right angle to the access tunnel 10 such that a person can enter into the node element 12 via the access tunnel 10 without interrupting a shelter and a person can selectively move into the first adjoining access tunnel 13 or into the second adjoining access tunnel 14 without interrupting a shelter . the node element 12 is formed with a frame 20 and a roof element 21 , with the frame 20 having rollers 23 at the bottom side on which the node element 12 stands and being able to be traveled over a ground . the roof element 21 has an awning section 22 that is guided up to or partly over the vehicle 11 . fig2 shows another embodiment of the access tunnel system 1 with the access tunnel 10 , the node element 12 and the adjoining access tunnels 13 and 14 . the access tunnel system 1 is shown arranged in front of the vehicle 11 in the form of a bus 17 as an example . all the access tunnels 10 , 13 and 14 have node elements 12 formed the same as one another and the access tunnel 10 is shown in an extended state in a modified form with respect to the view in fig1 . folding bellows 18 that are shown in an outwardly pivoted state adjoin the exit sides of the access tunnels 13 and 14 , with the pivot angle corresponding to approximately 90 °. the folding bellows 18 have been pivoted in front of the doors 16 of the bus 17 and the folding bellows 18 have awning elements 19 that cover the doors 16 or over the bus 17 such that a person can enter into the bus 17 from the access tunnel 13 , 14 by means of the folding bellows 18 without interrupting a shelter . fig2 shows a further door 16 of the bus 17 with which the node element 12 has been brought into coverage , and the further door 16 is located beneath the awning 22 of the roof element 21 of the node element 12 . a person can thus also enter into the bus 17 directly from the node element 12 . the embodiment of the access tunnel system 1 is shown with respect to a bus loading / unloading and the vehicle 11 , forms a bus 17 , for example , such as is used on the apron of an airport . the access tunnel system 1 can also serve , with the same features in accordance with the invention , as an access system for an aircraft , for example , so that stairs for fastening an aircraft can adjoin the access tunnels 13 and 14 , and it is also conceivable that the access tunnel system 1 is led up to a building such that the access tunnels 13 and 14 open , for example , up to the entrance doors of a building . the invention is not restricted in its design to the preferred embodiment provided above . a number of variants are conceivable that may make use of the solution shown with generally differently designed embodiments . all the features and / or advantages , including any construction details or spatial arrangements , originating from the claims , the description or the drawings can be essential to the invention both per se and in the most varied combinations .