A door that is pivotable and slidable relative to a vehicle includes an articulated arm pivotably supported at a pivot joint, a guide carriage displaceably guided by a guide rail and coupled to the pivot joint, a tie rod, the tie rod being hingedly connected to the guide carriage, and a spring-loaded index bolt which is vertically displaceable. The door further comprises a rotary slide having a rotary slide surface which dictates vertical movement of the index bolt between a first position in which the articulated arm and the tie rod are engaged by the index bolt so that the articulated arm and the tie rod rotate in unison and a second position in which the tie rod is disengaged from the index bolt so that the articulated arm pivots relative to the tie rod.