A moving staircase (escalator) with two flights of steps (1, 1′), a first flight for resetting one foot and a second flight for resting the other foot, equipped with synchronized reciprocating motion so that when the first flight goes up the second one goes down by the pace corresponding to a step, the user, by alternating the resting foot onto the steps of the two flights, will make no effort in waiting along it and he/she will not have to bend the limbs. The elevator finds its elective application as emergency escalator, also as fire-fighting staircase and as moving staircase for users prevented from an ease moving of limbs. The escalator can also-conveniently be rested onto pre-exiting flights.