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Narrow Streets, Timely ResponseNarrow Streets, Timely Response
Healthy Streets for AmericaHealthy Streets for America
Overhang 14 feet’
Dan Burden, Senior Urban Designer, Glatting Jackson Dan Burden, Senior Urban Designer, Glatting Jackson
and Director of Walkable Communities, Inc.and Director of Walkable Communities, Inc.
Turning Radius must also accommodate overhang
85% to 93% of all calls are now medical or traffic related
Traffic Calming Publications
Authored by: Dan Burden
Walkable Communities
The World is Changing
Expect:
Option One:
25% more traffic every ten years.
More intersections failing.
More people spreading out into canyons,
ridges and other high risk locations.
Also Expect:
More cars per household
Limited new lanes and limits on intersections
being rebuilt
More demand for slowing traffic
More demand for traffic to stay in motion
More demand for safer streets
More demand for quieter streets
Emergency is here
Responder is here
Give us nearly free movement for our first 80%
of our journey,
and protect our access to the final 20%
What planners, developers and people often fear
What planners, developers and people want
Portland, Oregon
Charlottesville, Virginia
20 Feet
26 Feet
Proper width entry, and protected space is on the correct side of the intersection
New Hope, Seattle, Washington
Healthy street system provide quick, efficient, uncluttered travel ways and response times on major routes leading up to local street system
Cambridge, Mass.
32nd
STREET BARRICADE
32nd
STREET BARRICADE
42nd
STREET BARRICADE
42nd
STREET BARRICADE
EXISTING NETWORK
EFFECTIVE NETWORK
1) Why is connectivity important?
All Trips are
External
Most Trips
are Internal
12 Points
of Access
250
125
75
21
15
Land Use
Connectivity Requirements - Examples
Link-node ratio of 1.44
Virginia DOT
Connectivity Requirements
Compact Area Type for Network Additions
• Link-Node Ratio of 1.6 or greater
• One external connection as well as an additional external connection and stub-out per 50 links or fraction thereof
Virginia DOT
Connectivity Requirements
Suburban Area Type for Network Additions
• Link-Node Ratio of 1.4 or greater
• One external connection as well as an additional external connection and stub-out per 50 links or fraction thereof
Virginia DOT
Meriam Park, Chico, California
:C o n n e c t iv it y
N e t w o r k
Holcomb Bridge Rd.
Holcomb Bridge Rd.
Alp
har
etta
Hw
y.
Alp
har
etta
Hw
y.
Crossville Rd.
Crossville Rd.
Cra
bap
ple
Rd
.C
rab
app
le R
d.
Old Ala Rd.
Old Ala Rd.
Hembree Rd.Hembree Rd.
AzaleaAzalea
Pine Grove Rd.
Pine Grove Rd.
Marietta Hwy.
Marietta Hwy.
Woodstock R
d.
Woodstock R
d.
Riversid
e Rd
.
Riversid
e Rd
.
Hardscrabble Rd.
Hardscrabble Rd.
Ho
uze Rd
.
Ho
uze Rd
.
400400
N
3,568 miles of roads
:C o n n e c t iv it y
E f f e c t iv e N e t w o r k
21%
of the Total Network is “Effective”
Holcomb Bridge Rd.
Holcomb Bridge Rd.
Alp
har
etta
Hw
y.
Alp
har
etta
Hw
y.
Crossville Rd.
Crossville Rd.
Cra
bap
ple
Rd
.C
rab
app
le R
d.
Old Ala Rd.
Old Ala Rd.
Hembree Rd.Hembree Rd.
AzaleaAzalea
Pine Grove Rd.
Pine Grove Rd.
Marietta Hwy.
Marietta Hwy.
Woodstock R
d.
Woodstock R
d.
Riversid
e Rd
.
Riversid
e Rd
.
Hardscrabble Rd.
Hardscrabble Rd.
Ho
uze Rd
.
Ho
uze Rd
.
400400
N
735 miles of roads
U.S. Vehicle Miles Traveled (Per Capita) is 27 miles Daily
Atlanta Vehicle Miles Traveled (Per Capita) is 66 miles Daily
Primary response
Secondary response
Tertiary response
Neighborhood
connector
Use trail connectors and neighborhood connectors for added entries
Bellevue, Washington
186th S.E. Bellevue, Washington
Bellevue, Washington
Bellevue, Washington
Bellevue, Washington
Sammamish, Washington
University Place, Washington
10 Feet
University Place, Washington
10 Feet
University Place, Washington
Martin Luther King, Pensacola, Florida
Avenue
Lane
Street
Heal
thy
Stre
ets
Acce
ss
Mountable
median nose
Primary response
Ten Foot Visual Space
13 Foot Physical Space
Proper application of
rollover curbing
Gainesville, Florida
Motorist parks in Tee intersection
blocks large equipment from entry
Solution?
Curb extensions
Two-Step curbing
Charlottesville, Virginia
Protect Access to all Locations• No humps or bumps (some tables or raised intersections)
• Proper turn radii (protect right-turn entries)
• Preserve 20’ operations width
• Bike lanes and parking help with turning radius
• Set landscape features back from corners
• Curb extensions are helpful in protecting access
• Provide high connectivity (system redundancy)
Performance Measure: Able to maintain 4 minute response time to all most locations
• Use care in tree selection and placement
Gainesville, Florida Emergency Response Team and Public Works Department
Unit is able to clear chicane at 28 mph
Gainesville, Florida
Critical entry to neighborhood. Streets are too narrow for rare event.
Bus breaks down, emergency call comes in. Only one
way in
Two micron clearance!!! Gainesville, Florida
8.0 ft
outer wheel42.0 ft
inner wheel
28.3 ft
over
hang
43.5
ft
Single Unit (“SU”) Truck Turning Radius
0 10 20 40
Reframing Key Transportation ConventionsDESIGN TRAFFIC – Vehicle Types
Plan must provide adequate turning radii,
not excessive
width
Departure road 20.0 feet wide, Entry road 20.0 feet wide turning radius of vehicle: WB-40
AASHTO and other national standards permit
designers to use full roadway receiving radius for
oversize vehiclesA fine grained road system with well distributed traffic
allows narrow entries
“Design Vehicle”
Ordinary vehicle using road section
“Controlling Vehicle”
Extra-Ordinary vehicle using
road section can be
accommodated through other
solutions at site.
Chico, California
Bike lanes provide places for motorists to pull over.
Widths of 5-7 feet are effective
Mountable
median nose
24 Foot Wide Street
20 Feet
26 Feet
Proper width entry, but protected space is on the wrong side of the intersection
Midblock Access
Seattle, Washington
Issaquah Highlands, WashingtonMotor Court
Upper Arlington, Ohio
Suisun City, California
20 Feet Wide
6 Feet
2 Feet
Ten Foot Visual Space
13 Foot Physical Space
Right-of-Way 68- 84 feet
12'
7-11' 12-20' 7-11'5' 10'
10'
7' 7' 5'
AVENUE
10 Feet
7 Feet
6 Feet6 Feet
University Place, WashingtonCurb-to-Curb 17 feet 33
mph running speeds
12 Feet
5 Feet
Natomas, Sacramento, CaliforniaCurb-to-Curb 17 feet 38
mph running speeds
What fire administrators often
fear
What Fire administrators should accept
Petaluma, CaliforniaBoth streets are 28 feet wide (Yield Streets)
Mill Valley, Washington
11 Feet 10 Feet 11 Feet
Federal Blvd, Denver, Colorado
New Hope, Seattle, Washington
New Hope, Seattle, Washington
27 Feet
Healthy streets provide the best opportunity to sustain property value (traffic calmed neighborhoods increase property values), which increases tax base to sustain high quality government services, including emergency response.
Speeds: 20-22 mph 28-32 mphValue Same homes $5-15K less
Suisun City, California
ALLEY
Right-of-way 20 – 22 feet
10-12'5'
8' 8'
5'
Corner radii are tight, but mountable
Mobile Narrow Streets WorkshopPetaluma, California
Accordion doors
Accessible ladders
Acacia Roundabout, Clearwater, Florida
La Jolla Boulevard, Bird Rock, San Diego, California (Five to two lane conversion, before). Four signals and one four-way stop being removed. Back-in Angled
parking to be added. (23,000 ADT)
78 Feet
La Jolla Boulevard, Bird Rock, San Diego, California
14 Feet
Healthy streets provide the best opportunity to sustain property value (traffic calmed neighborhoods increase property values), which increases tax base to sustain high quality government services, including emergency response.
Speeds: 20-22 mph 28-32 mphValue: Same homes $5-15K less
Suisun City, California
Philadelphia, Pennsylvania
Cambridge, Mass.
In MemoriamFire Chief, Ralph Burden
1915- 2000
Thanks, Dad
For Everything
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