Methods, systems, and devices for wireless communications are described. The described techniques provide identifying a first set of time intervals for transmissions in a channel using a first wireless communications technology (e.g., a set of LTE-V2X intervals reserved for LTE-V2X transmissions) and a second set of time interval designated for transmissions in the channel using a second wireless communications technology (e.g., a set of DSRC intervals reserved for DSRC transmissions). A UE may determine whether one of the sets of time intervals is available for transmitting V2X messages using one wireless communications technology by performing energy detection for a threshold amount of time. The UE may then, based on the results of the energy detection, transmit the V2X message using the first wireless communication technology during a second set of time intervals or during a subsequent first set of time intervals.