This application concerns certain 4-cyanophenylamino-substituted bicyclic heterocycles of formula Iwhere the dashed line represents a double bond that may be located either between A and C or between C and D, where A is S or C; D is S or C; provided that one and only one of A and D is S; where T is NH, O, or S; and where other substituents are defined herein. A setting terminal is connected to a camera server via a network for communication with each other. 5 to 15% of silicon in molecules of the alkoxysilane oligomer has been replaced with titanium. The data processor receives the data signal from the sensor elements and determines a radial wear level of the tread element based on the data signal.