At an interconnected signalized intersection that is located within 100 feet of a grade crossing, all existing permissive turning movements toward the grade crossing should be prohibited during the signal preemption sequences.

A blank-out or changeable message sign should be used to prohibit said turning movements towards the grade crossing during preemption operations. The blank-out sign should display its message when activated during a preemption event upon receipt of the crossing active notification; when inactive, the sign should display a blank face. The blank-out sign may also be activated during normal operations to prevent on track queuing.

Typical examples of blank-out signs are shown in Figures 6-9 and 6-10, this legend emphasizes that the turn restriction is associated with the presence of an approaching train and should be included when these signs are used exclusively during preemption. A blank-out sign should be mounted at both the near and far sides of the intersection where clear visibility is provided to approaching motorists at all times. Near and far side signs provide for duplicity in the event of one of the signs malfunctioning. At intersections with permissive only left-turns towards the tracks, an R3-2 sign shall be provided to the right of the signal head controlling left-turn movements.