1. CENTRAL HEALDSBURG AVENUE PLAN
TONIGHT’S AGENDA
16 November
 Introduction to CHASSA
 Forum #1: ‘TRANSPORATION + MOBILITY’
 Questions and Answers
 Consultant Working Session with
CHASSAC
 Confirm Next steps/ Forum #2

2. CENTRAL HEALDSBURG AVENUE PLAN
What is CHASSA?
 10 Month Study initiated by the City Redevelopment
Agency
 About 80 acres - entry to Healdsburg

3. 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

4. CENTRAL HEALDSBURG AVENUE PLAN
Study Area for Transportation
Plan Area

5. 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

6. CENTRAL HEALDSBURG AVENUE PLAN
Transportation Planning Basics
 Terms
 Level of Service / Quality
of Service
Automobile
Level of Service
User Quality of
Service

7. 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

8. CENTRAL HEALDSBURG AVENUE PLAN
Automobile Level of Service
LOS A LOS C
LOS D
LOS F
Images courtesy of Jim Charlier

9. CENTRAL HEALDSBURG AVENUE PLAN
Multi-modal Streets

10. CENTRAL HEALDSBURG AVENUE PLAN
Complete Streets
Reallocating Street Width to Accommodate All Users
4 lane street narrowed to 2 lanes to add bike lanes

11. 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.

12. CENTRAL HEALDSBURG AVENUE PLAN
Pedestrian Connectivity
 Complete sidewalk grid
 ADA accessible
 Short blocks
 Pathways through parking lots
to the doors of buildings

13. CENTRAL HEALDSBURG AVENUE PLAN
Pedestrian Capture Zone
 ½ mile
walk
radius to
station

14. 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

15. CENTRAL HEALDSBURG AVENUE PLAN
Bicycle Capture Zone
 1½ mile
bike radius
to station

16. CENTRAL HEALDSBURG AVENUE PLAN
Context Sensitive Solutions (CSS)
 Harmony
 Balance
 Compatibility
16
Photo: Community, Design +
Architecture

17. 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.

18. 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

19. CENTRAL HEALDSBURG AVENUE PLAN
Bringing Place and Transportation
Design Together
19
E14th Corridor - San Leandro, CA Source: Community, Design + Architecture and Urban Advantage

20. CENTRAL HEALDSBURG AVENUE PLAN
E14th Corridor - San Leandro, CA Source: Community, Design + Architecture and Urban Advantage
20
Bringing Place and Transportation
Design Together

21. 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

22. CENTRAL HEALDSBURG AVENUE PLAN
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

23. CENTRAL HEALDSBURG AVENUE PLAN
US 101 Interchanges
 Evaluate:
 Full interchange
 Configurations
 Travel patterns
 5-way
 Closure of ramps

24. CENTRAL HEALDSBURG AVENUE PLAN
Change in Travel Patterns
 Current travel
patterns

25. CENTRAL HEALDSBURG AVENUE PLAN
Change in Travel Patterns
 Potential travel
patterns
 Highly interactive
interchange and
roundabout
 Traffic concentrated
on Mill
 Access control

26. 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.

27. 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

28. CENTRAL HEALDSBURG AVENUE PLAN
Source: NKAPC and DLZ Corporation

29. CENTRAL HEALDSBURG AVENUE PLAN
Two-Lane Modern Roundabout
Source: Kimley-Horn and Associates, Inc.

30. CENTRAL HEALDSBURG AVENUE PLAN
Source: www.pedbikeimages.org / Dan Burden

31. CENTRAL HEALDSBURG AVENUE PLAN

32. 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

33. 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.

34. 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

35. CENTRAL HEALDSBURG AVENUE PLAN
Roundabout Cons
 More right of way
 Learning curve
 Initial public uncertainty
 Bicyclists uncomfortable
 Blind pedestrian concern