1

Northampton Main/King Charrette

Nelson\Nygaard Consulting Associates

22

33

44

55

66

77

88

99

1010

1111

1212

1313

1414

1515

1616

1717

1818

1919

2020

21

Overbuilt streets cause speeding

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.

23

Wide Streets Are Less Safe

Street widths and injury accident rate, graphic by Peter Swift

24

Seattle Conversions (4 to 3 Lane)

Roadway Date ADT ADT Collision

Location Change Before After Reduction

Greenwood Ave N

N 80th St to N 50th

N 45th Street

Wallingford Area

8th Ave NW

Ballard Area

Martin Luther King Jr W

North of I 90

Dexter Ave N

Queen Ann Area

24th Ave NW

NW 85th to NW 65thOct-95 9727 9754

14 to 10

28%

Jun-91 13606 1494919 to 16

59%

Jan-94 12336 1316115 to 6

60%

Jan-94 10549 1185818 to 7

61%

Dec-72 19421 2027445 to 23

49%

Apr-95 11872 1242724 to 10

58%

25

Taking a Road Diet

26

Seattle Conversions (4 to 3 Lane)

Roadway Date ADT ADT Collision

Location Change Before After Reduction

Greenwood Ave N

N 80th St to N 50th

N 45th Street

Wallingford Area

8th Ave NW

Ballard Area

Martin Luther King Jr W

North of I 90

Dexter Ave N

Queen Ann Area

24th Ave NW

NW 85th to NW 65thOct-95 9727 9754

14 to 10

28%

Jun-91 13606 1494919 to 16

59%

Jan-94 12336 1316115 to 6

60%

Jan-94 10549 1185818 to 7

61%

Dec-72 19421 2027445 to 23

49%

Apr-95 11872 1242724 to 10

58%

27

Greenwood Avenue: 12,000 cars per day

28

Dexter Ave: 15,000 cars per day

29

45th Street in Wallingford: 20,000 cars per day

30

31Northern King Street – 80’ Right-of-Way

EXISTING

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

IDEAL

33

34

School

Shop

PlayWork

PP

P

P

PP

T TT T

TTT

TTT

T

T

Conventional Development

35

Mixed-Use District

School

Work

Play

Shop

P

TT

Results:

<½ the parking

<½ the land area

¼ the arterial trips

1/6th the arterial turning movements

<¼ the vehicle miles travelled

36Middle King Street – 62’ Right-of-Way

EXISTING

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

IDEAL

38

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

EXISTING

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

IDEAL

41Southern King Street – 55’ Right-of-Way

CHANGES IN PAINT

4242

4343

4444

45

46

4747

4848

49

50

5151

5252

5353

54

5555

56

5757

58

59

60

space….