In a method for checking the plausibility of a wrong-way driving of a motor vehicle when entering a unidirectional roadway, a traversing of a stop line or a solid line of a junction of the unidirectional roadway is detected and/or at least one item of directional information of a roadway of the junction, which is located ahead of the motor vehicle, is collected, and a probability of a wrong-way driving is ascertained based on the detection. The method is performed by a control and detection unit for checking the plausibility of a wrong-way driving.