Method for detecting fast total blockage of a sensor, comprising the steps of: collecting and storing information concerning the numbers of targets and objects detected by the sensor, the number of objects created, and the number of objects lost within the detection field of the sensor in each detection cycle over a predetermined time window; splitting the time window into a first partition, a second partition, and third partition; determining a first performance indicator based on the number of targets detected in the first partition of the time window, wherein the first performance indicator is defined as the median number of targets over the detection cycles in the first partition; a second performance indicator based on the number of targets detected in the third partition of the time window, wherein the second performance indicator is defined as the median number of targets over the detection cycles in the third partition; and a degradation indicator based on the number of objects lost within the detection field of the sensor during the second partition of the time window, wherein the degradation indicator is defined as an object deletion rate which is defined as the sum of the object deletion ratios over the detection cycles in the second partition, wherein the object deletion ratio for each detection cycle is defined as the ratio of the difference between the number of objects deleted in the detection field of the sensor and the number of objects created to the total number of objects; and determining that a fast total blockage event has happened if the first performance indicator shows detection performance typical for the sensor if the median number of targets is greater than a predetermined number, the degradation indicator shows a fast degradation of detection performance if the object deletion rate is higher than a predetermined value, and the second performance indicator shows detection performance untypical for the sensor if the median number of targets is lower than a predetermined number. collecting and storing information concerning the numbers of targets and objects detected by the sensor, the number of objects created, and the number of objects lost within the detection field of the sensor in each detection cycle over a predetermined time window; splitting the time window into a first partition, a second partition, and third partition; determining a first performance indicator based on the number of targets detected in the first partition of the time window, wherein the first performance indicator is defined as the median number of targets over the detection cycles in the first partition; a second performance indicator based on the number of targets detected in the third partition of the time window, wherein the second performance indicator is defined as the median number of targets over the detection cycles in the third partition; and a degradation indicator based on the number of objects lost within the detection field of the sensor during the second partition of the time window, wherein the degradation indicator is defined as an object deletion rate which is defined as the sum of the object deletion ratios over the detection cycles in the second partition, wherein the object deletion ratio for each detection cycle is defined as the ratio of the difference between the number of objects deleted in the detection field of the sensor and the number of objects created to the total number of objects; and determining that a fast total blockage event has happened if the first performance indicator shows detection performance typical for the sensor if the median number of targets is greater than a predetermined number, the degradation indicator shows a fast degradation of detection performance if the object deletion rate is higher than a predetermined value, and the second performance indicator shows detection performance untypical for the sensor if the median number of targets is lower than a predetermined number.