ITE District 6 Meeting
   NOV 2006 | CALIFORNIA




West Hill Studies Road Diet:
Reducing Lanes for a Community
West Hill Study
Reducing Lanes for a Community
               PRESENTED BY

               Eric Shimizu, P.E / SEA




   ...
Introduction


 Context – how it shapes our view

 History and background

 A focus on “one” of the corridors

 Problem as...
West Hill Time History


  Community Advisory Group Established (9/2000)

  CAG worked with King County for improvements

...
Introduction


 Context – how it shapes our view

 History and background

 A focus on “one” of the corridors

 Problem as...
West Hill Time History


  Community Advisory Group Established (9/2000)

  CAG worked with King County for improvements

...
Vicinity Map

Rainier Avenue




                       I-405

                 I-5
Rainier Avenue Background


 4-lane roadway section (1 mile segment)
 35 MPH speed limit
 Passes through residential and c...
Blank



 blank

 blank
  • blank
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            Existing
Corridor Problems


 Speeding / Safety

 Poor side street sight distance

 Access Issues – High number of access
 points

...
LEFT Turns
THRU Cars
Impatient Ones
    Source: Road Diets
Alternative Selection Process


  Numerous alternatives analyzed
  3 - lane alternative selected
Stakeholder Response:
   ...
A bit counter intuitive for Engineers.
So how can we help the public understand?

 2002 ADT          18,000 - 19,000 VPD
 ...
LEFT Turns
THRU Cars
Impatient Ones
    Source: Road Diets
Source: Road Diets
Source: Road Diets
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 blank

 blank
  • blank
  • blank




            Existing
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  • blank
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            Proposed
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            Built option
             Proposed
Closing Thoughts

    Improvements with the lane reduction
    •   LOS improved
    •   Improved access to driveways
    •...
Questions?




                            PRESENTED BY




Eric Shimizu, P.E     The Transpo Group      erics@thetranspog...
Ite California Slide Presentation 2006
Ite California Slide Presentation 2006
Ite California Slide Presentation 2006
Ite California Slide Presentation 2006
Ite California Slide Presentation 2006
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Ite California Slide Presentation 2006

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Road Diet Conversion of 4 lanes to 3

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Ite California Slide Presentation 2006

  1. 1. ITE District 6 Meeting NOV 2006 | CALIFORNIA West Hill Studies Road Diet: Reducing Lanes for a Community
  2. 2. West Hill Study Reducing Lanes for a Community PRESENTED BY Eric Shimizu, P.E / SEA ITE | November 2006 | California
  3. 3. Introduction Context – how it shapes our view History and background A focus on “one” of the corridors Problem assessment Selected alternative Closing Thoughts
  4. 4. West Hill Time History Community Advisory Group Established (9/2000) CAG worked with King County for improvements West Hill Corridor Study (5/2002) • Rainier Avenue South • Renton Avenue South Construction Completed (11/2004)
  5. 5. Introduction Context – how it shapes our view History and background A focus on “one” of the corridors Problem assessment Selected alternative Closing Thoughts
  6. 6. West Hill Time History Community Advisory Group Established (9/2000) CAG worked with King County for improvements West Hill Corridor Study (5/2002) • Rainier Avenue South • Renton Avenue South Construction Completed (11/2004)
  7. 7. Vicinity Map Rainier Avenue I-405 I-5
  8. 8. Rainier Avenue Background 4-lane roadway section (1 mile segment) 35 MPH speed limit Passes through residential and commercial Regional Link prior to Interstate System 2002 ADT 18,000 - 19,000 VPD • Peak Hour 900 SB & 770 NB
  9. 9. Blank blank blank • blank • blank Existing
  10. 10. Corridor Problems Speeding / Safety Poor side street sight distance Access Issues – High number of access points Hostile environment for pedestrians Accidents
  11. 11. LEFT Turns THRU Cars Impatient Ones Source: Road Diets
  12. 12. Alternative Selection Process Numerous alternatives analyzed 3 - lane alternative selected Stakeholder Response: Won’t taking a lane reduce capacity? Our analysis indicated, no. It actually improved operations.
  13. 13. A bit counter intuitive for Engineers. So how can we help the public understand? 2002 ADT 18,000 - 19,000 VPD • Peak Hour 900 SB & 770 NB 2025 ADT 26,600 - 27,000 VPD • Peak Hour 1,300 SB & 1100 NB Well unfortunately, not with numbers Some other conversion projects • 1998 Kirkland (LK WA Blvd 30,000 ADT) • 1994 Seattle (MLK 15,000 ADT) • 1972 Seattle ( N. 45th Street 20,000 ADT)
  14. 14. LEFT Turns THRU Cars Impatient Ones Source: Road Diets
  15. 15. Source: Road Diets
  16. 16. Source: Road Diets
  17. 17. Blank blank blank • blank • blank Existing
  18. 18. Blank blank blank • blank • blank Proposed
  19. 19. Blank blank blank • blank • blank Built option Proposed
  20. 20. Closing Thoughts Improvements with the lane reduction • LOS improved • Improved access to driveways • Improved bicycle corridor • Speed dictated by average driver • Safe refuge for turning vehicles • Coordination between agencies Potential Challenges • Frequency of signalized I/S • Steep Grades: Impact to Transit and Heavy Vehicles • Passing in the TWLTL • Introducing this change to the regular users
  21. 21. Questions? PRESENTED BY Eric Shimizu, P.E The Transpo Group erics@thetranspogroup.com ITE | November 2006 | California

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