Charrette: Main and King Streets JS
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Transcript of Charrette: Main and King Streets JS
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Northampton Main/King Charrette
Nelson\Nygaard Consulting Associates
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Overbuilt streets cause speeding
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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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Wide Streets Are Less Safe
Street widths and injury accident rate, graphic by Peter Swift
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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%
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Taking a Road Diet
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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%
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Greenwood Avenue: 12,000 cars per day
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Dexter Ave: 15,000 cars per day
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45th Street in Wallingford: 20,000 cars per day
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To a driver:
To an economist:
LOS F
LOS A
LOS A
LOS F
Measuring Success
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Cars on a street
Why Plan for other Modes?
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People in Cars
Why Plan for Other Modes?
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People on a bus
So You Can Drive
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People on bikes
So You Can Drive
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Measuring Success
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School
Shop
PlayWork
PP
P
P
PP
T TT T
TTT
TTT
T
T
Conventional Development
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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
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How land-use affects travel demand
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How land-use affects travel demand
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One Square Mile
One Square Mile, Contemporary development pattern, Irvine, CA
(Jacobs, Allan, Great Streets, MIT Press, Cambridge, MA)
One Square Mile, Traditional development pattern, Portland OR
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One Square Mile
One Square Mile, Northampton today
(Jacobs, Allan, Great Streets, MIT Press, Cambridge, MA)
One Square Mile, Traditional development pattern, Portland OR
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Poor Parking Availability Produces Traffic Congestion
Every parking space is a magnet for
cars. Why provide more parking than
you have traffic capacity to access that
parking?
Poorly managed parking results in
motorists circling for a parking space,
from 8 to 74% of traffic in many
downtowns.
Eliminating just 10% of vehicles from
any congested location makes traffic
free flowing.
Sources: “Cruising for Parking,” Don Shoup, 2006.
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$20,000$20,000
$20,000
$20,000
$20,000$20,000$20,000
$20,000$20,000$20,000
$20,000
$20,000$20,000$20,000$20,000$20,000$20,000$20,000 $20,000$20,000$20,000
$20,000$20,000$20,000$20,000
$20,000
Parking Wastes Money
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What Land Value Are We Losing?
Parking Space10’ x 20’ = 200 ft2Bedroom 9’ x 11’ = 99 ft2
Office Cubicle8’ x 9’ = 72 ft2
Restaurant Table5’ x 5’ = 25 ft2
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Boulder CO: TOD Without the Rails
Source: Will Toor & Spenser Havlick
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Boulder’s strategies
No nonresidential parking requirements
Public garages – 84% funded by parking fees
Employee benefits: free universal transit pass (Eco-Pass); Guaranteed Ride Home; ride-matching services; bicycle parking, etc.
Eco-Pass: reduces commuter parking demand by 850 spaces
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Multi-Use Path System
Source: Will Toor & Spenser Havlick
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A New Bike Culture
Source: Will Toor & Spenser Havlick
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Boulder: Results
0%
10%
20%
30%
40%
50%
60%
70%
1995 1997 1999 2001 2003 2005
Drive Alone
Carpool
Bus
Walked & Biked
Multi-Mode & Other
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How to Apply These Ideas Here?
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Medford, MA
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Barrier to Utilization of
Eastern Spaces
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PEDESTRIAN LEVEL-OF-SERVICE
AVERAGE
Pedestrian
Delay
A
B
C
D
E
F
Seconds Likelihood of Noncompliance
<10 Low
10-20
21-30 Moderate
31-40
41-60 High
>60 Very High
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PEDESTRIAN LEVEL-OF-SERVICE
MAXIMUM
Pedestrian
Delay
A
B
C
D
E
F
Seconds Likelihood of Noncompliance
<10 Low
10-20
21-30 Moderate
31-40
41-60 High
>60 Very High
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SQUARE REDESIGN
Transform
to a
Four Leg
Intersection?
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PROPOSED DESIGN
NEW DELAY5-MINUTE WALKING AREA
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Why not Consider…
Economic Development
• Job creation
• Real estate value increase
• Retail sales
Quality of Life
• Access to jobs
• Access to shopping
• Residential property value
impact
Social Justice
• Do benefits accrue
equitably?
• Are investments spread
equitably?
Ecological Sustainability
• VMT per capita (=CO2,
NOx, runoff, etc.)
• Land use/transportation
connection
Measure what matters
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Location Matters: Transportation is a Significant Household Expense
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Where can a 3-person household earning 80% of area
median income live in the Twin Cities?
Considering Housing Costs Housing + Transportation Costs
The Housing & Transportation Costs Trade-Off
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Housing Costs in Metro Washington, DC
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Housing & Transportation Costs in Metro Washington, DC
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space….
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MAIN STREET CORRIDOR
Northampton Design Charrette
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KING STREET CORRIDOR
Northampton Design Charrette
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