Signalized intersections require the first stopped vehicle on one approach to be visible to the first vehicle stopped on all other approaches. Left-turning vehicles should have sufficient sight distance to select gaps in oncoming traffic and complete left turns.

For traffic signal control intersections with a pattern of sight distance-related crashes due to limited visibility, an appropriate crash countermeasure is signalization. However, if the traffic signal is to be placed on two-way flashing operation (i.e., flashing yellow on the major-road approaches and flashing red on the minor-road approaches) under off-peak or nighttime conditions, then Case B sight triangles should be provided for the minor road approaches. In addition, if right turns on a red signal are permitted from any approach, then the appropriate departure sight triangle for Case B should be provided to accommodate right turns from that approach.