IMPACT OF TRANSIT SIGNAL PRIORITY (TSP) ON BUS TRA VEL TIMES, LATE - - PowerPoint PPT Presentation

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IMPACT OF TRANSIT SIGNAL PRIORITY (TSP) ON BUS TRA VEL TIMES, LATE - - PowerPoint PPT Presentation

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IMPACT OF TRANSIT SIGNAL PRIORITY (TSP) ON BUS TRA VEL TIMES, LATE BUS RECOVERY , DELAY AND LEVEL OF SERVICE (LOS) Presenter: Sotonye Ikiriko 1 , Deo Chimba 1 College of Engineering, Tennessee State University, Nashville TN 37209 USA 21 st

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SLIDE 1

IMPACT OF TRANSIT SIGNAL PRIORITY (TSP) ON BUS TRA VEL TIMES, LATE BUS RECOVERY , DELAY AND LEVEL OF SERVICE (LOS)

Presenter: Sotonye Ikiriko1, Deo Chimba1

College of Engineering, Tennessee State University,

Nashville TN 37209 USA

21st June 2018

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SLIDE 2

Introduction

Transit Signal Priority (TSP)

A strategy to Speed up Transit Vehicle

Movement Benefits

Boost Transit Movement Without

undue Impact on other Road Users

Reduce Bus Bunching Improve Transit (bus) Schedule

Adherence

Reduce High Auto Dependency Expand Mobility Choices Improve Transit ridership Reduce Energy consumption, green

house Gases and other Pollutants

2

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SLIDE 3

Principle of TSP Operation

Components

3

Transit vehicle detection system Communication system Traffic signal control system

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SLIDE 4

Why TSP?

Nashville is fast growing

According to Randall Gross everyday

85 people come into Nashville

High traffic congestion Poor bus serviceability Poor Schedule Adherence Transit unattractiveness

According to David Hartgen only

1.5 to 2.5% of Nashville Residents use Transit

4

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SLIDE 5

Study Corridor

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Gallatin Pike corridor 12.3 miles Long An arterial roadway two lanes in each direction continuous left turn lane 48 signalised intersections 104 posted bus stops

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SLIDE 6

Modelled Section of Gallatin Corridor

1.83 Miles Long Two lanes in each Direction Continuous left turn lane 9 signalized Intersection 7 bus stops in each direction

6

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SLIDE 7

Research Objectives

Evaluate the impact of TSP on;

Transit operation

Bus Schedule Adherence in Terms of Late bus

recovery at bus Stop level

Bus Travel Time Reduction Mainline and Side Street Delays

Intersection Level of Service (LOS)

7

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SLIDE 8

Methodology

Microsimulation Software Selection VISSIM Data collection Origin Destination (OD) Matrix

Estimation and Validation

Principle of Conservation Of Vehicles

Base Model Development in VISSIM Base Model Calibration and Validation Alternative Concept TSP VAP code: Green extension and Red

truncation TSP strategies

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SLIDE 9

Data Collection

Roadway Geometry

Intersection Layout Lane Configuration Bus Stop location and Types

Traffic Data

Turning Movement Count(TMC) General Traffic Travel Time

Transit Data

Speed Profile Bus travel Time Boarding and Alighting Count Ridership Schedule Adherence

Traffic Control Data

Signal Timing and Phasing Plans

9

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SLIDE 10

Base Model Development

Corridor Geometry Connectors Urban Motorised Driving

Behaviour

Wiedemann 74 car

following Model

Vehicle Composition Desired Speed Distribution Public Transportation Stops Public Transportation Line

10

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SLIDE 11

Dynamic Assignment In VISSIM

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SLIDE 12

Base Model Calibration and Validation

OD Matrices Calibration Speed Calibration Simulated and Observed

Speed (PE < 5%)

Travel Time Validation

Simulated and Observed

Travel Time (PE < 15%)

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PE=Percentage Error

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SLIDE 13

TSP Signal Logic Implementation

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Passive Priority

It allocates more green time

to approaches having higher bus flow than it would for others

Active Priority

Green Extension Red Truncation

Vehicle Actuated Programing (VAP)

Code

Signal Timing and Phasing Plans

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SLIDE 14

TSP Signal Logic Implementation in V AP Code

Bus Detector 75m from signal Signal Head Bus Detector 75m from signal Minimum Recall Detectors Gap out Detectors Bus Stop

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SLIDE 15

OD Matrix Calibration and Validation Results

y = 1.3672x - 1.9452 R² = 0.8569

200 400 600 800 1000 1200 1400 200 400 600 800 1000 1200 1400

Estimated (Veh\hr) Observed (Veh\hr)

OD Matrix Validation

y = 0.9661x - 2.1964 R² = 0.9984

200 400 600 800 1000 1200 1400 1600 200 400 600 800 1000 1200 1400 1600

Simulated (Veh\hr) Estimated (Veh\hr)

OD Matrix Calibration

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SLIDE 16

Impact of TSP on Main Line Travel Time

EB= Eastbound, WB= Westbound

100 150 200 250 300 350 400 450 500 550 600 EB WB EB WB EB WB EB WB Bus Car HGV All Vehicles

Average Travel Time (Sec) MainLine Vehicle Types

Main Line Travel Time Measurement

Base Base + TSP

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SLIDE 17

Impact of TSP on Main Line Vehicle Delay

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50 100 150 200 250 300 EB WB EB WB EB WB EB WB Bus Car HGV All Vehicles

Vehicle Delay (sec) Main Line Approach

Main Line Vehicle Delay

Base Base + TSP

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SLIDE 18

Late Bus Recovery at Bus Stop Level

50 100 150 200 250 300 350 400 Stop 1 Stop 2 Stop 3 Stop 4 Stop 5 Stop 6 Stop 7 Stop 1 Stop 2 Stop 3 Stop 4 Stop 5 Stop 6 Stop 7 PT Line 1 PT line 2

Lateness (Sec) PT lines and Bus Stops

Late Bus Recovery

Base Base + TSP

PT Line = Public Transportation Line

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SLIDE 19

Impact of TSP on Side Street Vehicle Delay

20 40 60 80 100 120 NB SB NB SB NB SB NB SB NB SB NB SB NB SB NB SB NB SB Alta Loma Unnamed River Gate Pkwy Cude Ln Shepherd Hills Conference Dr Liberty Ln North Side 2284-2282 TN-6

Vehicle Delay (Secs) Intersection Approach

Side Street Delay Comparison

Base Base + TSP

SB=Southbound, NB=Northbound

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SLIDE 20

Significance of TSP on Side Street Delay

Group Statistics Scenario N Mean Std. Deviation

  • Std. Error

Mean Delay Base 64 48.9344 21.25447 2.65681 Base + TSP 64 55.2509 20.20847 2.52606 Independent Samples Test Levene's Test for Equality of Variances t-test for Equality of Means F Sig. t df

  • Sig. (2-

tailed) Mean Difference Std. Error Difference 95% Confidence Interval of the Difference Lower Upper Delay Equal variances assumed 0.215 0.643

  • 1.723

126 0.087

  • 6.31656

3.66601

  • 13.57148

1 Equal variances not assumed

  • 1.723

125.68 0.087

  • 6.31656

3.66601

  • 13.57166

1

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SLIDE 21

Overall Corridor Performance In Terms

  • f Level of Service

Intersection

Name Intersection Delay & LOS Base LOS Base + TSP LOS % Increase % Reduce Alta Loma 27.3 C 31.1 C 14.0

Unnamed 21.5 C 21.5 C 0.2

Rivergate 34.1 C 42.4 D 24.3 Cude Lane 21.3 C 23.3 C 9.2 Shepherd Hills 20.9 C 21.4 C 2.2 Conference Dr 24.8 C 26.1 C 5.1 Liberty 17.1 B 17.9 B 4.6 North Side 17.7 B 18.5 B 4.4 2284-2282 TN-6 8.0 A 8.0 A 0.1 All Intersection 21.4 C 23.3 C 8.0 0.1

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SLIDE 22

Conclusion

  • TSP will reduce bus travel time by about 5% to 10%
  • Reduce Travel time for other vehicles utilizing the priority

approach by about 5.8%

  • Reduce bus delay by about 11% to 23%
  • Reduce delay for other vehicles utilizing the priority

approach by about 11.6%

  • Reduce bus lateness by about 34.16%
  • Increase Side Street Delay by about 15.9%
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SLIDE 23

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Thank You For Listening Any Questions?