| CPC B60R 21/0134 (2013.01) [B62D 24/00 (2013.01); B62D 63/025 (2013.01); B60R 2021/01013 (2013.01); B60R 2021/01252 (2013.01)] | 18 Claims |

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1. An apparatus for use on a vehicle, said vehicle including a main body and a sub-body, and when said vehicle being in normal operation such as moving on a road, said sub-body is being laid on said main body;
wherein at least one recess of said sub-body, is being disposed on one or both lateral sides of said sub-body, for accommodating a portion of corresponding respective at least one road-running wheel of said vehicle, and as a result, said at least one road-running wheel constituting a hindrance to longitudinal and/or lateral relative movement between said sub-body and said main body;
wherein said apparatus comprising:
a controlling system;
a sub-body positioning system, under control of said controlling system, configured to facilitate said relative movement by detaching said sub-body from said main body and also, configured to not allow said relative movement by attaching said sub-body and said main body directly or indirectly;
a detection system, under control of said controlling system, configured to detect a collision or an imminent collision involving said vehicle, and to provide related collision information;
a device configured to, under control of said controlling system, cause said at least one road-running wheel to make a telescopic movement out of said at least one recess, so as to facilitate said relative movement;
wherein when said sub-body positioning system facilitating said relative movement between said sub-body and said main body, said relative movement happening only if being caused by a collision force directly or indirectly on said sub-body, exceeding a limit, thereby avoiding a greater damage to said sub-body which would happen if said sub-body positioning system being not allowing said relative movement;
wherein said controlling system controlling both said sub-body positioning system and said device to allow facilitate relative movement, according to said collision information directly or indirectly.
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