Abstract: The present invention relates in one aspect to a toy construction system for constructing and operating a remote controlled toy vehicle model. The system comprises: a plurality of modular toy elements; a modular toy vehicle base detachably connectable with the modular toy elements by means of coupling members so as to construct a toy vehicle model; and a remote control device adapted to control motorized functions in the modular toy vehicle base. The modular toy vehicle base further comprises an interaction sensor adapted to generate an interaction signal in response to a mechanical interaction with the toy vehicle model; wherein the toy construction system further comprises a processor with a signal analysis process. The signal analysis process is configured to perform an analysis of the interaction signal for indications of a building interaction according to predetermined criteria, and based on the analysis to generate an output indicative of a building interaction status.