Where there are unique roadway configurations located near to the railroad tracks, preemption operations may need to be further evaluated to provide the appropriate traffic signal operations to effectively clear the tracks. For example, if a grade crossing is located adjacent to a diamond interchange, consideration should be given to clearing the space between the roadway intersections in addition to clearing the tracks. Figure 5-3 provides an example of how this can be accomplished. Note that when programming the preemptors, the signal technician must program the phases and overlaps for correct operation.