A rolling motor vehicle comprising: a frame ; at least one rear driving wheel ; a left front steered wheel and a right front steered wheel (7") placed side by side in a right-left direction (L-R); a rolling four bar linkage comprising: an upper cross member extending transversely to a median plane of the motor vehicle , in a right-left direction; a lower cross member extending transversely to the median plane of the motor vehicle , in a right-left direction; a left upright , which connects the upper cross member and the lower cross member to each other; a right upright (16"), which connects the upper cross member and the lower cross member to each other; a left support arm constrained to the left upright so as to rotate with respect thereto about a respective steering axis; wherein the left front steered wheel is connected to the left support arm with the interposition of a left suspension comprising an elastic member and a shock absorber ; a right support arm (21") constrained to the right upright (16") so as to rotate with respect thereto about a respective steering axis; wherein the right front steered wheel (7") is connected to the right support arm (21") with the interposition of a right suspension comprising an elastic member and a shock absorber ; characterized in that each shock absorber comprises a cylinder , inside which a piston is slidingly housed, which divides the interior of the cylinder into a first chamber and a second chamber , fluidly coupled to one another through at least one flow passage extending through the piston ; a suspension locking device comprising, for each of said suspensions , a valve adapted to at least partially close a communication duct which fluidly connects the first chamber with a tank , preventing a flow of viscous fluid between the chamber and the tank . a frame ; at least one rear driving wheel ; a left front steered wheel and a right front steered wheel (7") placed side by side in a right-left direction (L-R); a rolling four bar linkage comprising: an upper cross member extending transversely to a median plane of the motor vehicle , in a right-left direction; a lower cross member extending transversely to the median plane of the motor vehicle , in a right-left direction; a left upright , which connects the upper cross member and the lower cross member to each other; a right upright (16"), which connects the upper cross member and the lower cross member to each other; a left support arm constrained to the left upright so as to rotate with respect thereto about a respective steering axis; wherein the left front steered wheel is connected to the left support arm with the interposition of a left suspension comprising an elastic member and a shock absorber ; a right support arm (21") constrained to the right upright (16") so as to rotate with respect thereto about a respective steering axis; wherein the right front steered wheel (7") is connected to the right support arm (21") with the interposition of a right suspension comprising an elastic member and a shock absorber ; characterized in that each shock absorber comprises a cylinder , inside which a piston is slidingly housed, which divides the interior of the cylinder into a first chamber and a second chamber , fluidly coupled to one another through at least one flow passage extending through the piston ; a suspension locking device comprising, for each of said suspensions , a valve adapted to at least partially close a communication duct which fluidly connects the first chamber with a tank , preventing a flow of viscous fluid between the chamber and the tank . <EOS>