mid-states highway-rail crossing safety conference larry j. colclasure, p.e
Post on 11-Feb-2016
45 Views
Preview:
DESCRIPTION
TRANSCRIPT
Mid-States Highway-Rail Crossing Safety Conference
Larry J. Colclasure, P.E.Director of Transportation OperationsTexas Department of Transportation
Waco District
lcolclasure@dot.state.tx.us
WacoDistrict
Dallas Ft Worth
Austin
Waco
Temple Killeen
Fort Hood
Copperas Cove
Requires cooperation between agencies
Dependent on others Catastrophic results when things
don’t go according to plan
Key Concerns with Preemption:
Other Key Concerns with Preemption: Tools not available to assist. Static (factors do not change). Infrequent occurrences.
It equals a continual relearning process and a poor understanding by many technicians and engineers.
Waco
Temple Killeen
Fort Hood
Copperas Cove
Copperas Cove, Texas
Pedestrian Issues to Consider:
How to account for pedestrians. How to handle ped walk time? How to handle ped clearance time?
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?
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?
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
Recent Tools Developed:
LADOT Preemption Form with Gate Interaction (Sean Skehan)
Texas Signal Coordination Optimization [Preemption page] (Michael Pratt & James Bonneson)
top related