A hood-lifting safety device for use in a vehicle, the device comprising: a first elongate support member which is mounted, in use, to part of a vehicle, a second elongate support member which incorporates a mounting edge which is mounted, in use, to the hood of a vehicle, the first and second support members (3,15) being attached to each other pivotally, and a movement element which is configured to be driven in a drive direction, characterised in that: the second support member is provided with a primary elongate guide edge which extends at least partly along the second support member, the primary guide edge being inclined at an angle relative to the drive direction with the primary guide edge sloping away from the mounting edge in the drive direction, wherein the first support member incorporates a reference edge which is adjacent to and substantially parallel with the mounting edge of the second support member when the second support member is in an initial position, and wherein the first support member is provided with a secondary elongate guide edge which is inclined an angle relative to the drive direction with the secondary guide edge sloping towards the reference edge in the drive direction, the movement element engaging the primary guide edge and the secondary guide edge and exerting a force slidably along at least part of the length of the primary guide edge and the secondary guide edge when the movement element is driven in the drive direction to pivot the second support member relative to the first support member from the initial position to an activated position. a first elongate support member which is mounted, in use, to part of a vehicle, a second elongate support member which incorporates a mounting edge which is mounted, in use, to the hood of a vehicle, the first and second support members (3,15) being attached to each other pivotally, and a movement element which is configured to be driven in a drive direction, characterised in that: the second support member is provided with a primary elongate guide edge which extends at least partly along the second support member, the primary guide edge being inclined at an angle relative to the drive direction with the primary guide edge sloping away from the mounting edge in the drive direction, wherein the first support member incorporates a reference edge which is adjacent to and substantially parallel with the mounting edge of the second support member when the second support member is in an initial position, and wherein the first support member is provided with a secondary elongate guide edge which is inclined an angle relative to the drive direction with the secondary guide edge sloping towards the reference edge in the drive direction, the movement element engaging the primary guide edge and the secondary guide edge and exerting a force slidably along at least part of the length of the primary guide edge and the secondary guide edge when the movement element is driven in the drive direction to pivot the second support member relative to the first support member from the initial position to an activated position. the second support member is provided with a primary elongate guide edge which extends at least partly along the second support member, the primary guide edge being inclined at an angle relative to the drive direction with the primary guide edge sloping away from the mounting edge in the drive direction, wherein the first support member incorporates a reference edge which is adjacent to and substantially parallel with the mounting edge of the second support member when the second support member is in an initial position, and wherein the first support member is provided with a secondary elongate guide edge which is inclined an angle relative to the drive direction with the secondary guide edge sloping towards the reference edge in the drive direction, the movement element engaging the primary guide edge and the secondary guide edge and exerting a force slidably along at least part of the length of the primary guide edge and the secondary guide edge when the movement element is driven in the drive direction to pivot the second support member relative to the first support member from the initial position to an activated position.