PROTECTING THE SILVER LINE FROM CONGESTION IN DUDLEY SQUARE - - PowerPoint PPT Presentation

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PROTECTING THE SILVER LINE FROM CONGESTION IN DUDLEY SQUARE - - PowerPoint PPT Presentation

May 29, 2023 221 likes •456 views

PROTECTING THE SILVER LINE FROM CONGESTION IN DUDLEY SQUARE GUILHERME TOMIYOSHI NAKAO M.S. CIVIL ENG. - TRANSPORTATION ENG. ADVISOR: PETER G. FURTH NORTHEASTERN UNIVERSITY 05/26/2016 AREA OF STUDY Bus lane Dedicated Bus lane Mixed

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PROTECTING THE SILVER LINE FROM CONGESTION IN DUDLEY SQUARE

GUILHERME TOMIYOSHI NAKAO

M.S. CIVIL ENG. - TRANSPORTATION ENG.

ADVISOR: PETER G. FURTH NORTHEASTERN UNIVERSITY 05/26/2016

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Bus lane Dudley Station

Dedicated Bus lane Mixed Traffic

Mixed Traffic

AREA OF STUDY

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AVL DATA: SILVER LINE 5, PM PEAK

Dudley Station

  • Avg. Speed:

4.4 mph (6.45 ft/s)

  • Avg. Speed: 4.4 mph
  • Avg delay: 2.5 min
  • 95th-p delay: 4.4 min
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Queuing region

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Queuing around Dudley Station

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Single-lane queuing

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Washington St and Warren St junction

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Washington St @Ruggles St

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Main bottlenecks on Washington St

  • @ Ruggles St
  • @ Malcolm X Blvd /

Dudley St

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  • Unsignalized intersection
  • Informal priority rules force

SB Washington St traffic to stop

  • Wash. St @ Ruggles St
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  • Wash. St @ Ruggles St: Cut-Through traffic
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  • Insufficient capacity for Phase 1 (30 s
  • ut of 100)
  • Many other problems with this signal
  • Ped pushbutton = inappropriate
  • Long crossing (88 ft – equivalent of 8

lanes)

  • Ped phase (26 s) is non-compliant
  • Unprotected left turn Dudley-Wash:

unsafe, often blocks a lane

  • WASH. ST @ MALCOLM X BLVD / DUDLEY ST
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  • Traffic turning counts
  • Signal timings
  • Pedestrian Volumes (at crosswalks and between them)
  • Bus volumes
  • Double Parking
  • Bus travel time from AVL
  • Modelled on PTV VISSIM

DATA COLLECTION

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AVL Data

04/05/16 04/06/16 04/07/16

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  • Low free-flow speed (19 mph, 13 mph)
  • Pedestrians on crosswalks and at dummy crosswalks
  • Double parking
  • Special priority rules around Ruggles St.
  • Occasional single lane queuing in front of Dudley Station
  • Buses leaving the station encroach on two lanes and force

their way in

Model features and Calibration

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Validation: SL5 Travel time

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Proposed changes: Ruggles St

  • Change to one-way

westbound from Washington St to Shawmut Ave

  • Similar to W. Newton,

Concord and Rutland Streets in the South End

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Proposed changes: Malcolm X Blvd / Dudley St

  • Eliminate northbound left turns (<10 veh/h)
  • Protected WB left turn
  • Concurrent pedestrian Phase every cycle
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Geometric changes

  • Crossing distance reduced from 88 to 62 ft
  • Left turn bay added
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PROPOSED SIGNAL TIMING PLAN

  • Maintains 100 s coordination along Dudley
  • Increased capacity SB
  • Ped phases are concurrent, automatic and longer
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SL Travel Time: AVL x Base Sim x Proposed changes

0% 10% 20% 30% 40% 50% 60% 70% 80 120 160 200 240 280 320 360 400 440 480 520+

Silver Line Travel time (s) – AVL x Base x Proposed changes

AVL data Base model Proposed changes

Existing (AVL): Mean 229 s; σ = 86 s Existing (Base Model): Mean 234s; σ =115 s Proposed: Mean 109 s; σ = 37 s

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Contact info

Guilherme Tomiyoshi Nakao

MS Civil Eng – Transportation Engineering Northeastern University

guinakao@gmail.com