An embodiment of the present invention relates to a method for a UE transmitting a signal in a wireless communication system supporting a plurality of transmission time interval (TTI) lengths, wherein the signal transmission/reception method comprises the steps of: performing a measurement for each first-TTI resource unit; selecting a first-TTI resource that is the closest to first-TTI resources having measurement results that are greater than or equal to a preset value on the time axis; and transmitting a signal using the selected first-TTI resource. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, the BS or a network.