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