Tracks that cross through the middle of a signalized intersection need to be considered when performing preemption calculations as illustrated in Figure 3-2.

When evaluating a crossing with tracks through the middle of the signalized intersection, the designer should synchronize the traffic signal all-red indication with the activation of the railroad flashing lights. The TxDOT Form 2304 should include the MTCD measurement to determine the clearance time for the crossing and RWTT. The railroad total warning time should be sufficient to clear all vehicles from the tracks, thus the calculated advance preemption time should be equal to or greater than the RWTT. Once right-of-way transfer is complete, the traffic signal shall hold an all-red indication as the Preemption Clearance Interval until the crossing is clear.