1. Mid-States Highway-Rail Crossing Safety Conference Larry J. Colclasure, P.E. Director of Transportation Operations Texas Department of Transportation Waco District lcolclasure@dot.state.tx.us

2. Waco District Dallas Ft Worth Austin

3. Waco Temple Killeen Fort Hood Copperas Cove

6.  Requires cooperation between agencies  Dependent on others  Catastrophic results when things don’t go according to plan Key Concerns with Preemption:

7. Other Key Concerns with Preemption:  Tools not available to assist.  Static (factors do not change).  Infrequent occurrences.

8. It equals a continual relearning process and a poor understanding by many technicians and engineers.

9. Waco Temple Killeen Fort Hood Copperas Cove

10. Copperas Cove, Texas

19. Pedestrian Issues to Consider:  How to account for pedestrians.  How to handle ped walk time?  How to handle ped clearance time?

20. Vehicular Issues to Consider:  How much time is needed to clear the queue?  How much time is needed for track clearance green?  Is preemption affected by the signal being in different phases?  What is preemption delay time?

21. Railroad Issues to Consider:  How much preemption time do I need?  How much advance preemption time is needed?  How much total preemption time do I have available?

23. Recent TxDOT Research on Preemption  0-4265 Improved Traffic Signal Operation near Railroad Grade Crossings with Active Devices  0-4746 Non-Vital Advance Rail Preemption of Signalized Intersections near Highway –Rail Grade Crossings  0-5629 Best TxDOT Practices for Signal Timing & Detection Design at Intersection

24. Recent Tools Developed:  LADOT Preemption Form with Gate Interaction (Sean Skehan)  Texas Signal Coordination Optimization [Preemption page] (Michael Pratt & James Bonneson)