udot connected vehicles - transportation...transit signal priority infrastructure roadside equipment...

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

pjager@Utah.gov

Chuck Felice

cfelice@Utah.gov

Blaine Leonard

bleonard@utah.gov