udot connected vehicles - transportation...transit signal priority infrastructure roadside equipment...
TRANSCRIPT
UDOT Connected Vehicles
Peter JagerChuck Felice
Blaine Leonard
Connected Vehicles - First Attempt?
UDOT Connected Vehicle Projects
Transit Signal Priority Snow Plow Preemption
Initial Utah Transit CV Deployment
• Goal
• Improved schedule reliability
• Minimal impact to other traffic
• Triggers• Late = > 5 minutes behind schedule• Occupancy = > 20% (~ 9 people)
Transit Fleets
Redwood Road DSRC Corridor
• First “operational” DSRC V2I
system in US• 11 mile urban arterial corridor
• UDOT-owned corridor• 30 signalized intersections• Varies from 5 to 7 lanes• • ADT: 18,000 to 40,000
• • 60,000 peak at I-215• Truck Traffic: 24%
• Two light-rail crossings• Demographic variety
• Commercial / Retail• Residential• High School• Community College
Transit Signal Priority Infrastructure
Roadside Equipment
DSRC RSU (24)
Ethernet cable to cabinet
Traffic Signals
Signal Controllers• Econolite ASC/3 &
Cobalt
• Intelight MaxTime
Beaglebone Linux Processor
On Board Equipment
DSRC OBU
Linux On-board Processor (OBP)
Antennas in/on bus roof
• RSU mounted on signal pole, mast
arm, luminaire pole
• Omni-directional antenna, but obstructions can impair signal
• 300 meter range (nominalminimum)
• Ethernet cable to cabinet
Redwood Road Installation
Transit Connected Vehicle Process
MMITSS (Multi-Modal Intelligent Traffic Signal System)
• Bus comes into range of DSRC at intersection• Connects to system via RSU• MMITSS receives GPS location from RSU• MMITSS retrieves SPaT and MAP data
• MMITSS (Multi-Modal Intelligent Traffic Signal System)
• determines bus location in lane, distance to signal
• MMITSS queries bus schedule system• If bus is late, MMITSS generates request for priority• Priority request is sent to roadside
• MMITSS-Utah: Sends priority request to controller
• Sends NTCIP command to controller – sets input PIN
Reliability increase:
88% to 94%
(southbound peak)
Provo-Orem BRT Project• 47 Intersections
• Intersection Variety – skews / curves
• MMITSS-Utah
• System started running in mixed traffic August 2018, DSRC was operational in Dec 2018.
Next Deployment Underway
Maintenance Fleets Transit Fleets Emergency Responders
Fleet Challenge: More Than Just DOTs
Taxi Fleets
This challenge will form key partnerships with
various fleet operators and help to shape connected
vehicle deployments in the future
CV Snow Plow Preemption Project
• Snow Plow Preemption Project
• Salt Lake Valley – 5 corridors
• 44 miles of instrumented roadway
• 55 DSRC Intersections
• 46 Snow Plows
• Budget: $473,000
• New technologies can be labor intensive
• Operational March 2019
• New corridor with 8 more miles will be added this winter
• Study on Effectiveness
• Winter ‘19-’20
Snow Plow Preemption Parameters
• Plow must be down
• Spreader operations must be active• Connection to ForceAmerica system
• There is no activation, confirmation, or indicator light for the plow operator.
• There are limitations to how soon the signal can change. Pedestrian clearance must
be completed on the cross street before signal cycles.
• This can result in a driver perceiving a malfunction.
• Safety analysis shows an anticipated 8% crash reduction.
Snow Plow On-Board Unit
• On-board unit has now been moved
to behind the driver seat
Snow Plow Operations Process
• Plow comes into range of DSRC at intersection• Continuously broadcasting BSM
• Receives SPaT and MAP data
• GPS reports plow location
• MMITSS determines plow location in lane, distance to signal
• MMITSS sends preemption request to roadside unit.
• MMITSS-Utah: Sends preemption request to
controller.
• Sends NTCIP command to controller – sets input PIN
• RSU sends a confirmation to the OBU that request is received, but cannot confirm it was granted (controller limitation)
Performance Measures
Benefits and Impacts• Improved Transit Reliability
• Improved Snow Plow Efficiency and Safety
• Neither proven yet . . .
• Connected Vehicle Technology (DSRC) is:
• Functional and Available
• Able to bring measurable benefits
• Scalable to more locations and applications
• UDOT is Planning More Deployment
More DSRC CV Deployment Coming
• Additional Transit Signal Priority Routes
• State Street, Utah Co. (2020)
• State Street SL County (2020)
• Two to three additional TSP Corridors in 2021
• Extension of 3300 South MAX BRT Corridor with TSP
• Additional Snow Plow Pre-emption Routes
• Snow Plow Pre-emption on UVX Route (2019)
• Two more Snow Plow Pre-emption Corridors (2020)
• Additional Applications
• Curve Speed Warning Application (20 locations)
• Road Weather Warning Application (20 locations)
• 2000 other vehicles equipped over next 4 years
Thank you! Questions?
Peter Jager, P.E., PTOE
Chuck Felice
Blaine Leonard