I-405 Peak-Use Shoulder Lane Project Overview Barrett Hanson, P.E. - - PowerPoint PPT Presentation

▶
i 405 peak use shoulder lane
SMART_READER_LITE
LIVE PREVIEW

I-405 Peak-Use Shoulder Lane Project Overview Barrett Hanson, P.E. - - PowerPoint PPT Presentation

Dec 09, 2023 447 likes •638 views

I-405 Peak-Use Shoulder Lane Project Overview Barrett Hanson, P.E. Design Manager WSDOT I-405/SR 167 Program Karl Westby, PhD Traffic Manager WSDOT I-405/SR 167 Program NOCoE Webinar Sept. 28, 2017 1 Project Setting I-405/SR 167 Corridor

slide-1
SLIDE 1

I-405 Peak-Use Shoulder Lane

Project Overview

NOCoE Webinar

  • Sept. 28, 2017

Barrett Hanson, P.E.

Design Manager WSDOT I-405/SR 167 Program

Karl Westby, PhD

Traffic Manager WSDOT I-405/SR 167 Program

1

slide-2
SLIDE 2

I-405/SR 167 Corridor

  • 40-mile freight and commuter corridor
  • North-south alternative to I-5
  • One of the most congested routes in

Washington State

  • Home to fastest-growing population and

job centers in greater Seattle area I-405 express toll lanes

  • Opened between Bellevue and Lynnwood

in Sept. 2015

  • Two-lane system between Bellevue

and Bothell

  • Single-lane system between Bothell

and Lynnwood

  • Extension of system funded between

Bellevue and Renton to connect with SR 167 high occupancy toll lanes

Project Setting

2

slide-3
SLIDE 3

Challenge: High Demand, Limited Capacity

Bottleneck moved north after new capacity opened

  • Higher volumes moving

faster in five-lane section (Bellevue/Kirkland area)

  • Resulted in increased

congestion in three-lane section (Bothell area) High volumes entering I-405 at SR 527 during afternoon peak periods

  • ~1,000 vehicles/hour were forced to merge into full

general purpose lanes

  • The result: general purpose lane back-ups, less

reliable express toll lane trips (and higher toll rates) 3

slide-4
SLIDE 4

Traffic Conditions Before Shoulder Conversion

  • Heavy traffic during the

afternoon commute throughout the corridor

  • Congestion builds south of

SR 527 during peak periods

  • Desire for quick congestion

relief

February-April 2017

4

slide-5
SLIDE 5

Project Scope and Outreach

Converted existing right shoulder to 1.8 mile long, dynamically controlled general purpose peak-use shoulder lane First dynamically controlled peak-use shoulder lane in Washington State Extensive stakeholder coordination & outreach

  • Washington State Patrol
  • WSDOT traffic/tolling divisions
  • FHWA
  • Local cities
  • Freight industry
  • Traveling public
  • Elected officials

Total project cost: $11.5 million funded by toll revenue

  • $7.29 million construction contract

5

slide-6
SLIDE 6
  • Four overhead electronic lane control

signs with side-mounted message signs

  • 0.5 mile spacing
  • 5-foot by 5-foot lane control sign
  • Supplemental messages and

queue warnings

  • Four paved emergency pull-out areas
  • New quarter-mile long noise wall
  • Striping and delineators
  • Paving
  • Guardrail

Project Construction Elements

Typical northbound roadway cross-section

6

slide-7
SLIDE 7

$1.5M $1M

Project Costs

Design-build contract $7.29M $2.75M $1.75M $1.5M $3M

Design-builder design and administration Preliminary engineering WSDOT Construction Costs: CE, sales tax, design review and contingency Peak-use shoulder lane elements Noise wall Other project elements

7

slide-8
SLIDE 8

Rapid Project Timeline

2016 2017

April 24 Opened to traffic January Construction start March Project identified September Design-build RFP issued December Contract awarded

14 months from project identification to open to traffic

120 days from

NTP to opening

8

slide-9
SLIDE 9

Early performance: Congestion contours for general purpose lanes

BEFORE

February-April 2017

AFTER

First 3 months

9

slide-10
SLIDE 10

Early performance: Congestion contours for express toll lanes

BEFORE

February-April 2017

AFTER

First 3 months

10

slide-11
SLIDE 11

Early performance: Travel times

5 10 15 20 25 30 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00

Travel Times (min)

I-405 NB GP Travel Times from SR 522 to I-5

(SRMP: 21.83-28.98)

95th%-5th% Jan-Apr Avg 4/24/16-7/17/16 (M-F) 4/24/17-7/17/17 (M-F)

Avg Jan-Apr (M-F)

11

slide-12
SLIDE 12

Early performance data: Volumes

Five-hour Peak-Use Shoulder Lane Volumes (2 to 7 p.m.) Range of peak-use shoulder lane volumes by week

Highest Volume Day Lowest Volume Day Average Day

12

slide-13
SLIDE 13

Incidents

11 incidents in first five months of operation

  • Four collisions
  • Six disabled vehicles
  • One unclassified incident
  • Too early for trend identification

Disabled motor home blocked peak-use shoulder lane, resulting in temporary closure Box truck in emergency pullout partially blocked shoulder lane, triggering warning signs

13

slide-14
SLIDE 14

Positive feedback from the public

14

slide-15
SLIDE 15

Future peak-use shoulder lane projects planned in Seattle region

  • I-5, Everett to Marysville

(northbound only) Construction start: 2019

  • I-405, Renton area

(northbound only) Construction start: 2019 WSDOT is implementing peak-use shoulder lanes at strategic locations to add more space for travelers in a quick, cost-effective manner. WSDOT is also partnering with local transit agencies to open bus-only shoulders. 15

slide-16
SLIDE 16

Lessons learned

Design

  • Added delineation
  • Early stakeholder coordination

Implementation and Outreach

  • Robust public outreach for educating

the traveling public

  • Supplemental incident response

teams and enforcement

  • Managing public expectations of

implementing additional peak-use shoulder lanes

16

slide-17
SLIDE 17

CONTACT

Barrett Hanson Design manager, I-405/SR 167 program 425-456-8534 hansonb@ consultant.w sdot.w a.gov Karl Westby Traffic manager, I-405/SR 167 program 425-450-2537 w estbyk@ consultant.w sdot.w a.gov

17