The addition of four-way stop control is an inconvenience to all the drivers using the intersection. For this reason, 3 warrants have been developed and are listed in the Manual on Uniform Traffic Control Devices (MUTCD). A four-way stop installation should only be used when traffic volumes on the intersecting roadways are approximately equal. If volumes are particularly large, a traffic signal may be more appropriate. Investigating the warrants requires an extensive traffic engineering study.