Presented on March 16, 2011.

1. Northampton Main/King Charrette
NelsonNygaard Consulting Associates
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21. Overbuilt streets cause speeding
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22. Planning for pedestrian safety: Principles
Leaf, W. and Preusser, D. Literature Review on Vehicle Travel Speeds and Pedestrian Injuries
Among Selected Racial/Ethnic Groups, NHTSA (USA), 1999.
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23. Wide Streets Are Less Safe
Street widths and injury accident rate, graphic by Peter Swift
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24. Seattle Conversions (4 to 3 Lane)
Roadway Date ADT ADT Collision
Location Change Before After Reduction
Greenwood Ave N 24 to 10
Apr-95 11872 12427
N 80th St to N 50th 58%
N 45th Street 45 to 23
Dec-72 19421 20274
Wallingford Area 49%
8th Ave NW 18 to 7
Jan-94 10549 11858
Ballard Area 61%
Martin Luther King Jr W 15 to 6
Jan-94 12336 13161
North of I 90 60%
Dexter Ave N 19 to 16
Jun-91 13606 14949
Queen Ann Area 59%
24th Ave NW 14 to 10
Oct-95 9727 9754
NW 85th to NW 65th 28%
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25. Taking a Road Diet
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26. Seattle Conversions (4 to 3 Lane)
Roadway Date ADT ADT Collision
Location Change Before After Reduction
Greenwood Ave N 24 to 10
Apr-95 11872 12427
N 80th St to N 50th 58%
N 45th Street 45 to 23
Dec-72 19421 20274
Wallingford Area 49%
8th Ave NW 18 to 7
Jan-94 10549 11858
Ballard Area 61%
Martin Luther King Jr W 15 to 6
Jan-94 12336 13161
North of I 90 60%
Dexter Ave N 19 to 16
Jun-91 13606 14949
Queen Ann Area 59%
24th Ave NW 14 to 10
Oct-95 9727 9754
NW 85th to NW 65th 28%
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27. Greenwood Avenue: 12,000 cars per day
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28. Dexter Ave: 15,000 cars per day
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29. 45th Street in Wallingford: 20,000 cars per day
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31. EXISTING
Northern King Street – 80’ Right-of-Way 31

32. IDEAL
Middle King Street – 62’ Right-of-Way 32

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34. Conventional Development
Shop
School
P P
P
T T T T
T T T T T
TT
T
P
P
Work
Play P
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35. Mixed-Use District
Work
Shop
School
P
Play
T
T
Results:
<½ the parking
<½ the land area
¼ the arterial trips
1/6th the arterial turning movements
<¼ the vehicle miles travelled
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36. EXISTING
Middle King Street – 62’ Right-of-Way 36

37. IDEAL
Middle King Street – 62’ Right-of-Way 37

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39. EXISTING
Southern King Street – 55’ Right-of-Way 39

40. IDEAL
Southern King Street – 55’ Right-of-Way 40

41. CHANGES IN PAINT
Southern King Street – 55’ Right-of-Way 41

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60. space….
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