A snow-clearing trailer intended to be towed by a towing vehicle with a towing hitch, said snow-clearing trailer having: - a chassis extending longitudinally in a chassis direction (I-I) and having a snow-clearing blade, - at least one wheel (7a-7d) arranged so as to support the chassis on the ground, an axle of said wheel (7a-7d) being selectively orientable by orientation means between a first wheel position, in which an axis of the axle about which the wheel (7a-7d) rotates is perpendicular to the chassis direction (I-I), and at least a second wheel position, in which the axis of the axle about which the wheel (7a-7d) rotates makes with the chassis direction (I-I) an axle angle that is different from 90°, - a drawbar extending in a drawbar direction (III-III) between first and second drawbar ends, - at the first drawbar end, first connection means allowing a freely pivoting connection with the towing hitch of the towing vehicle about a first pivoting direction (IV-IV) substantially perpendicular to the plane defined by the chassis direction (I-I) and the axis of the axle about which said at least one wheel (7a-7d) rotates, wherein: - at the second drawbar end, the drawbar is articulated to the chassis so as to pivot about a second pivoting direction (V-V) substantially perpendicular to the plane defined by the chassis direction (I-I) and the axis of the axle about which said at least one wheel (7a-7d) rotates, - pivoting means allow the selective pivoting movement of the chassis of the trailer and the drawbar with respect to one another, and the fixing of the relative angular position of the chassis of the trailer and of the drawbar, between a transport position, in which the chassis direction (I-I) and the drawbar direction (III-III) are substantially parallel, and at least one snow-clearing position, in which the chassis direction (I-I) and the drawbar direction (III-III) form a non-zero angle with one another, - a drawbar locking bar is provided, which has a fixed length, of which one end can be attached to the drawbar and of which the other end can be attached to the chassis so as to immobilize the drawbar on the chassis in the transport position, characterized in that: - the snow-clearing trailer has detection means, which are able to generate an attachment signal when the drawbar locking bar is attached to the drawbar and to the chassis, - the snow-clearing trailer has first disabling means that are able to disable the pivoting means, - the first disabling means and the detection means are arranged in such a way that when the detection means generate an attachment signal, the first disabling means prevent any actuation of the pivoting means. - a chassis extending longitudinally in a chassis direction (I-I) and having a snow-clearing blade, - at least one wheel (7a-7d) arranged so as to support the chassis on the ground, an axle of said wheel (7a-7d) being selectively orientable by orientation means between a first wheel position, in which an axis of the axle about which the wheel (7a-7d) rotates is perpendicular to the chassis direction (I-I), and at least a second wheel position, in which the axis of the axle about which the wheel (7a-7d) rotates makes with the chassis direction (I-I) an axle angle that is different from 90°, - a drawbar extending in a drawbar direction (III-III) between first and second drawbar ends, - at the first drawbar end, first connection means allowing a freely pivoting connection with the towing hitch of the towing vehicle about a first pivoting direction (IV-IV) substantially perpendicular to the plane defined by the chassis direction (I-I) and the axis of the axle about which said at least one wheel (7a-7d) rotates, - at the second drawbar end, the drawbar is articulated to the chassis so as to pivot about a second pivoting direction (V-V) substantially perpendicular to the plane defined by the chassis direction (I-I) and the axis of the axle about which said at least one wheel (7a-7d) rotates, - pivoting means allow the selective pivoting movement of the chassis of the trailer and the drawbar with respect to one another, and the fixing of the relative angular position of the chassis of the trailer and of the drawbar, between a transport position, in which the chassis direction (I-I) and the drawbar direction (III-III) are substantially parallel, and at least one snow-clearing position, in which the chassis direction (I-I) and the drawbar direction (III-III) form a non-zero angle with one another, - a drawbar locking bar is provided, which has a fixed length, of which one end can be attached to the drawbar and of which the other end can be attached to the chassis so as to immobilize the drawbar on the chassis in the transport position, - the snow-clearing trailer has detection means, which are able to generate an attachment signal when the drawbar locking bar is attached to the drawbar and to the chassis, - the snow-clearing trailer has first disabling means that are able to disable the pivoting means, - the first disabling means and the detection means are arranged in such a way that when the detection means generate an attachment signal, the first disabling means prevent any actuation of the pivoting means.