Motor vehicle adapted to travel on a flat road, comprising: - a chassis extending in a plane parallel to the road, - a first wheel carrier to which is secured without any degree of freedom a rotational axis of a wheel, this axis passing through the center of the first wheel carrier, - a first suspension mechanically connecting the first wheel carrier to the chassis so that part of the weight of the vehicle bears on the wheel carried by this first wheel carrier, this suspension authorizing a reversible displacement of the first wheel carrier between a remote position and a close position in which the center of the first wheel carrier is closer to the chassis than in its remote position, - a bearing (14, 16), secured without any degree of freedom, to the chassis, - a bar rotatably mounted about a transverse axis inside the bearing (14, 16), this bar comprising a first attachment point mechanically connected to the first carrier wheel so that the first wheel carrier drives the first attachment point in rotation about the transverse axis in proportion to the amplitude of its displacement between its close and remote positions, - a coupling bar, attached to the chassis, comprising at a free end thereof a coupling adapted to cooperate with a corresponding coupling of another vehicle to connect them together and, alternately, to detach them from one other, this coupling bar being movable relative to the chassis in a reversible manner from a low position to a high position by rotating upward about the transverse axis, characterized in that the bar comprises a second attachment point mechanically connected to the coupling bar to move the coupling bar toward its high position as the first wheel carrier moves toward its close position and to move the coupling bar toward its low position as the first wheel carrier moves toward its remote position. - a chassis extending in a plane parallel to the road, - a first wheel carrier to which is secured without any degree of freedom a rotational axis of a wheel, this axis passing through the center of the first wheel carrier, - a first suspension mechanically connecting the first wheel carrier to the chassis so that part of the weight of the vehicle bears on the wheel carried by this first wheel carrier, this suspension authorizing a reversible displacement of the first wheel carrier between a remote position and a close position in which the center of the first wheel carrier is closer to the chassis than in its remote position, - a bearing (14, 16), secured without any degree of freedom, to the chassis, - a bar rotatably mounted about a transverse axis inside the bearing (14, 16), this bar comprising a first attachment point mechanically connected to the first carrier wheel so that the first wheel carrier drives the first attachment point in rotation about the transverse axis in proportion to the amplitude of its displacement between its close and remote positions, - a coupling bar, attached to the chassis, comprising at a free end thereof a coupling adapted to cooperate with a corresponding coupling of another vehicle to connect them together and, alternately, to detach them from one other, this coupling bar being movable relative to the chassis in a reversible manner from a low position to a high position by rotating upward about the transverse axis,