Abstract: A wheel chock having a threaded portion at one end of the chock and extending from the chock, a lower surface of the threaded portion is spaced a certain distance from a lower surface of the chock itself, such that a knot formed below the extended portion would not extend beyond a plane defined by the lower surface of the chock. Alternatively, the extended threaded portion may extend to the lower surface of the chock, but the chock contains an internal cavity of sufficient size to house a knot in a line, without the knot extending beyond a plane defined by the lower surface of the chock. A traction layer may be fixed to the lower surface of the chock to provide additional traction or holding power.