Method for locking a dual clutch transmission of a work vehicle, said dual clutch transmission essentially comprising: • an engine input shaft configured to be coupled to the output of an engine of said work vehicle, • a shaft configured to be coupled to a drive system of said work vehicle and • a forward clutch and a rearward clutch , each configured to be coupled to the engine input shaft ; • first and second intermediate shafts each configured to carry a plurality of gears , said first and second intermediate shaft being configured to be coupled, via respective first and second clutches , to said forward clutch and to said rearward clutch and being configured to be coupled to said shaft defining with one of said gears a predetermined speed ratio between said engine input shaft and said shaft , each of said gears defining a different predetermined speed ratio among them between said engine input shaft and said shaft , said locking method being characterized by comprising the following phases: • a first decelerating phase in which the vehicle speed is reduced until a predetermined velocity while a gear of said plurality of gears is coupled to said shaft to give a driving torque to one of said first and second shafts ; • a second phase in which said vehicle is maintained at said predetermined velocity; • a third phase in which a gear of said plurality of gears of the other of said first and second shafts is engaged; • a fourth phase in which said first and second clutches are both engaged in order to block said dual clutch transmission ; and • a fifth phase in which said forward and rearward clutches are disengaged and said input shaft is consequently decoupled from said dual clutch transmission . • an engine input shaft configured to be coupled to the output of an engine of said work vehicle, • a shaft configured to be coupled to a drive system of said work vehicle and • a forward clutch and a rearward clutch , each configured to be coupled to the engine input shaft ; • first and second intermediate shafts each configured to carry a plurality of gears , said first and second intermediate shaft being configured to be coupled, via respective first and second clutches , to said forward clutch and to said rearward clutch and being configured to be coupled to said shaft defining with one of said gears a predetermined speed ratio between said engine input shaft and said shaft , each of said gears defining a different predetermined speed ratio among them between said engine input shaft and said shaft , • a first decelerating phase in which the vehicle speed is reduced until a predetermined velocity while a gear of said plurality of gears is coupled to said shaft to give a driving torque to one of said first and second shafts ; • a second phase in which said vehicle is maintained at said predetermined velocity; • a third phase in which a gear of said plurality of gears of the other of said first and second shafts is engaged; • a fourth phase in which said first and second clutches are both engaged in order to block said dual clutch transmission ; and • a fifth phase in which said forward and rearward clutches are disengaged and said input shaft is consequently decoupled from said dual clutch transmission . <EOS>