udot connected vehicles - transportation...transit signal priority infrastructure roadside equipment...
TRANSCRIPT
![Page 1: UDOT Connected Vehicles - Transportation...Transit Signal Priority Infrastructure Roadside Equipment DSRC RSU (24) Ethernet cable to cabinet Traffic Signals Signal Controllers •Econolite](https://reader030.vdocument.in/reader030/viewer/2022041016/5ec811fef435dd4e690e9363/html5/thumbnails/1.jpg)
UDOT Connected Vehicles
Peter JagerChuck Felice
Blaine Leonard
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Connected Vehicles - First Attempt?
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UDOT Connected Vehicle Projects
Transit Signal Priority Snow Plow Preemption
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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
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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
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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
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• 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
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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
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Reliability increase:
88% to 94%
(southbound peak)
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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
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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
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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
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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.
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Snow Plow On-Board Unit
• On-board unit has now been moved
to behind the driver seat
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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)
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Performance Measures
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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
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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
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Thank you! Questions?
Peter Jager, P.E., PTOE
Chuck Felice
Blaine Leonard