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CENTRAL HEALDSBURG AVENUE PLAN
TONIGHT’S AGENDA16 November
Introduction to CHASSA
Forum #1: ‘TRANSPORATION + MOBILITY’
Questions and Answers
Consultant Working Session with CHASSAC
Confirm Next steps/ Forum #2
CENTRAL HEALDSBURG AVENUE PLAN
What is CHASSA? 10 Month Study initiated by the City
Redevelopment Agency
About 80 acres - entry to Healdsburg
CENTRAL HEALDSBURG AVENUE PLAN
Who is Doing the Study?
An inter-disciplinary team comprised of:
• Urban designers • Economic development specialists• Transportation planners• Environmental consultants• Civil engineers• Landscape architects• Specialists in sustainability, CEQA
and community outreach
CENTRAL HEALDSBURG AVENUE PLAN
Study Area for Transportation
Plan Area
CENTRAL HEALDSBURG AVENUE PLAN
Transportation Planning & Traffic Engineering
What we do Collaborate with team Plan mobility and
accessibility Analyze effects of land use Forecast travel “demand” Assess travel patterns Assess streets and
intersections Design multi-modal facilities Estimate parking needs Assess safety Conduct impact analyses
CENTRAL HEALDSBURG AVENUE PLAN
Transportation Planning Basics
Terms Level of Service /
Quality of Service
Automobile Level of Service
User Quality of Service
CENTRAL HEALDSBURG AVENUE PLAN
Level & Quality of Service
Level of Service Letter grades A – F Based on speed and
delays for automobiles
Quality of Service Letter grades A – F Based on perception of
users
CENTRAL HEALDSBURG AVENUE PLAN
Automobile Level of Service
LOS A LOS C
LOS DLOS F
Images courtesy of Jim Charlier
CENTRAL HEALDSBURG AVENUE PLAN
Multi-modal Streets
CENTRAL HEALDSBURG AVENUE PLAN
Complete StreetsReallocating Street Width to Accommodate All Users
4 lane street narrowed to 2 lanes to add bike lanes
CENTRAL HEALDSBURG AVENUE PLAN
What is Connectivity?
Connectivity refers to the density of connections in path or road network and the directness of links.
As connectivity increases, travel distances decrease and route options increase, allowing more direct travel between destinations.
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Pedestrian Connectivity
Complete sidewalk grid
ADA accessible
Short blocks
Pathways through parking lots to the doors of buildings
CENTRAL HEALDSBURG AVENUE PLAN
Pedestrian Capture Zone
½ mile walk radius to station
CENTRAL HEALDSBURG AVENUE PLAN
Bicycle Connectivity
Complete network of bike paths, lanes and wide shoulders
Connects to regional trail system and SMART station
Signed routes and maps for wayfinding
Short-term and long-term bicycle parking at destinations
CENTRAL HEALDSBURG AVENUE PLAN
Bicycle Capture Zone
1½ mile bike radius to station
CENTRAL HEALDSBURG AVENUE PLAN
Context Sensitive Solutions (CSS)
Harmony Balance Compatibility
16Photo: Community, Design + Architecture
CENTRAL HEALDSBURG AVENUE PLAN
All users Compact and mixed-
use Varying densities Pedestrian-scaled:
Blocks Buildings / signs Landscape Streets
Streets complement uses
Streetscapes with interest and amenity
Walkable Places
17
Photo: Kimley-Horn and Associates, Inc.
CENTRAL HEALDSBURG AVENUE PLAN
All Streets Can Be Walkable
Different functional emphasis
Serve all users
Different approaches to enhance walkablility
Low volume main street
High volume arterial
CENTRAL HEALDSBURG AVENUE PLAN
Bringing Place and Transportation Design Together
19
E14th Corridor - San Leandro, CA Source: Community, Design + Architecture and Urban Advantage
CENTRAL HEALDSBURG AVENUE PLAN
E14th Corridor - San Leandro, CA Source: Community, Design + Architecture and Urban Advantage
20
Bringing Place and Transportation Design Together
CENTRAL HEALDSBURG AVENUE PLAN
Overview of Major Transportation Study Elements
US 101 interchanges
Healdsburg / Westside / Vine / Mill 5-way intersection
Station area access and connectivity
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Types of Issues Addressed in Station Area Plans
Balance modes
Land uses Parking Connections Crossings Station access Cost ADA Efficiency Barriers Placemaking
Bus and auto circulation
Bike circulation
Pedestrian circulation
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US 101 Interchanges
Evaluate: Full
interchange Configurations Travel patterns 5-way Closure of
ramps
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Change in Travel Patterns
Current travel patterns
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Change in Travel Patterns
Potential travel patterns
Highly interactive interchange and roundabout
Traffic concentrated on Mill
Access control
CENTRAL HEALDSBURG AVENUE PLAN
Modern Roundabouts
How do they work?
When are they used?
What are the pros and cons?
Roundabouts are NOT traffic circles!
Source: Kimley-Horn and Associates, Inc.
CENTRAL HEALDSBURG AVENUE PLAN
How Roundabouts Work
Entering traffic yields
Counterclockwise 20-25 mph Autos yield to
pedestrians and bicyclists
Bikes merge Ride in middle of
lane Bikes may use
sidewalk
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Source: NKAPC and DLZ Corporation
CENTRAL HEALDSBURG AVENUE PLAN
Two-Lane Modern Roundabout
Source: Kimley-Horn and Associates, Inc.
CENTRAL HEALDSBURG AVENUE PLAN
Source: www.pedbikeimages.org / Dan Burden
CENTRAL HEALDSBURG AVENUE PLAN
CENTRAL HEALDSBURG AVENUE PLAN
Roundabouts and Pedestrians
Safer than conventional intersections
Cross one direction of traffic
Crossing visible to motorist
Crossings separate from entry and exit
Cross behind vehicles Refuge on splitter island Concern for the visually
impaired
Source: Canes and Tails A blog for Orientation and Mobility Specialists
CENTRAL HEALDSBURG AVENUE PLAN
When to Use
Safety problems Capacity problems Closely spaced
intersections Unusual geometry –
multiple legs Where sight is
obscured Gateways Retrofit projects
Source: Kimley-Horn and Associates, Inc.
CENTRAL HEALDSBURG AVENUE PLAN
Roundabout Pros
Minimize stopping / delay Fewer and less severe crashes Solves skewed, unusual or multi-leg
intersections More capacity than traffic signals Lower fuel consumption Reduces carbon emission Attractive gateways
CENTRAL HEALDSBURG AVENUE PLAN
Roundabout Cons
More right of way Learning curve Initial public uncertainty Bicyclists uncomfortable Blind pedestrian concern