A shuttle for a climbing protection system wherein the shuttle can be connected to a user and is guided along a cable, rope, or other elongate support member as the user climbs and grips the elongate support member in response to the user falling, the shuttle comprising: a frame; a guide structure on the frame and configured to receive an elongate support member and to guide the shuttle along the elongate support member as a user attached to the shuttle climbs; a clamping member mounted on the frame for movement between a free position, wherein the shuttle can move freely along the elongate support member received in the guide structure and a clamping position wherein the clamping member engages against the elongate support member in the guide structure to resist movement of the shuttle relative to the elongate support member, wherein the clamping member comprises a clamping surface that engages the elongate support member received in the guide structure with the clamping member in the clamping position, wherein the clamping member further comprises a connection feature configured to receive a connector for attaching a user to the shuttle, the connection feature being spaced from the clamping surface and the clamping member being pivot mounted to the frame at a location between the connection feature and the clamping surface, and wherein the clamping member is configured to move from the free position to the clamping position in response to a downward movement by the user attached to the shuttle; a blocking member mounted on the frame for movement between a closed position blocking removal of the elongate support member from the guide structure and an open position where the blocking member does not block removal of the elongate support member from the guide structure, wherein the blocking member is a blocking plate mounted on the frame to translate between the closed position and the open position; and a locking member mounted on the frame for movement between a locked position and an unlocked position, wherein the locking member is a locking lever mounted on the frame to pivot between the locked position and the unlocked position, wherein the clamping member is movable to an opening position from the free position, and the locking member comprises a surface that engages a surface on the clamping member to prevent the clamping member from moving from the free position to the opening position with the locking member in the locked position, and the clamping member comprises a post and the blocking member comprises a slot receiving the post, the slot being configured so that engagement of the post in the slot moves the blocking member from the closed position to the open position as the clamping member is moved from the free position to the opening position. a frame; a guide structure on the frame and configured to receive an elongate support member and to guide the shuttle along the elongate support member as a user attached to the shuttle climbs; a clamping member mounted on the frame for movement between a free position, wherein the shuttle can move freely along the elongate support member received in the guide structure and a clamping position wherein the clamping member engages against the elongate support member in the guide structure to resist movement of the shuttle relative to the elongate support member, wherein the clamping member comprises a clamping surface that engages the elongate support member received in the guide structure with the clamping member in the clamping position, wherein the clamping member further comprises a connection feature configured to receive a connector for attaching a user to the shuttle, the connection feature being spaced from the clamping surface and the clamping member being pivot mounted to the frame at a location between the connection feature and the clamping surface, and wherein the clamping member is configured to move from the free position to the clamping position in response to a downward movement by the user attached to the shuttle; a blocking member mounted on the frame for movement between a closed position blocking removal of the elongate support member from the guide structure and an open position where the blocking member does not block removal of the elongate support member from the guide structure, wherein the blocking member is a blocking plate mounted on the frame to translate between the closed position and the open position; and a locking member mounted on the frame for movement between a locked position and an unlocked position, wherein the locking member is a locking lever mounted on the frame to pivot between the locked position and the unlocked position, wherein the clamping member is movable to an opening position from the free position, and the locking member comprises a surface that engages a surface on the clamping member to prevent the clamping member from moving from the free position to the opening position with the locking member in the locked position, and the clamping member comprises a post and the blocking member comprises a slot receiving the post, the slot being configured so that engagement of the post in the slot moves the blocking member from the closed position to the open position as the clamping member is moved from the free position to the opening position.