One of the multiway stop control warrants is crash related. If an intersection meets this requirement and it has approximately equal approach volumes, a multiway stop control installation may be warranted for safety purposes. However, the overall results of the traffic engineering study and the professional judgment of the engineer should also be considered. In fact, research has shown that under certain conditions other traffic control measures may be more effective and safer than the addition of a multiway stop sign. A study conducted by the City of Irvine, California, indicated that simply improving intersection visibility can sometimes be a successful approach to crash reduction at intersections.