SUB18840 HEX Exhibit 23A* HEATH & ASSOCIATES, INC Transportation and Civil Engineering
May 26, 2015
Ms. Janelle Hitch, P.E.
City of Bainbridge Island
280 Madison Avenue N.
Bainbridge Island, WA 98110
Subject: Sight Distance for Rolling Sunrise Plat - Proposed Access points
Ms. Hitch:
I have field reviewed the proposed accesses for the project in order to address A.(2) of the order issued by
Hearing Examiner Stafford Smith from the October 20, 2014 order remanding the application of the
subject project for further studies and documentation. Attached to this letter report is an excerpt from the
report with his request for additional information.
This limited scope traffic assessment recommending sight distance requirements at the Rolling Sunrise's
two connections to the city of Bainbridge Island's public road network, assessing whether such
requirements will be met under existing conditions and whether proposed mitigations should be
implemented.
As outlined in the AASHTO guidelines, an entering vehicle eye height of 3.5 feet, located 10 feet behind
the traveled way, as represented by the edge of roadway and an approaching vehicle height of 3.5 feet
should be used in determining entering sight distance. Attached to this letter is an excerpt from the
AASHTO guidelines, Exhibit 9-55, which indicates the intersection sight distances for various speeds.
The sight distance desired for 15 mph is 170 feet. Each of the accesses is discussed below
Hyla Avenue Access
The project access to Hyla Avenue will serve three lots within the Rolling Sunrise project. The roadway
is posted at 25 mph, however, operating speeds given the curvilinear nature of the roadway and narrow
widths are estimated at approximately 15 mph with lower speeds expected near the several curves along
this roadway including the curve which is accessed by the Rolling Sunrise project.
The access to the Rolling Sunrise project is located on the outside of a tight curve with a centerline radius
of approximately 50 to 60 feet. Sight distance looking westerly from the connection point exceeds 200
feet.
When looking southerly, a sight distance of 175 feet is achieved assuming tree trimming over the right of
way. Additional sight distance when looking south can be achieved depending on the further reduction of
vegetation that encroaches into the right of way and sight lines. Because of the vegetation a picture was
not taken.
A copy of the Kitsap County assessor map for this area shows the road layout in conjunction with the
parcels in the vicinity of Hyla Avenue near the Rolling Sunrise access.
2214 Tacoma Road Puyallup WA 98371 (253) 770 1401 Fax (253) 770 1473 heathtraffic.com
EXHIBIT
23
Recommendations for Hyla Avenue Access
Based on this field review and assessment, I would recommend the following conditions:
1. Coordinate with city to maintain vegetation within right of way and sight lines.
2. Add signage on Hyla by placing a curve warning sign W1-10 and 10 mph advisory plate in both
directions. Both the right turn and left turn version would be installed. See attached excerpt of the
sign from the MUTCD.
Sunrise Drive Access
The project access to Sunrise Drive proposes to serve four new homes. The proposed access will parallel
an existing access located adjacent and just east of the Rolling Sunrise access and connect at the right
angle corner of Sunrise Drive NE and NE Duncan Lane. Both accesses tie into this comer of Sunrise and
Duncan and are approximately 25 feet apart. This existing access in reviewing Kitsap County Assessor
records shows 3 lots using it for access. The operating speeds for Sunrise and Duncan near the vicinity of
the Rolling Sunrise connection is approximately 15 mph given the road cross-section and the right angle
corner.
When looking easterly on Duncan Lane from the Rolling Sunrise access, sight distance over 170 feet is
attainable. When looking east, the driver should be warned that a parallel driveway is present. There is
currently vegetation that impairs view of a vehicle traveling parallel with the driver emanating from the
Rolling Sunrise access.
Recommendation for Sunrise Drive Access
Based on this field review and assessment, I would recommend the following conditions:
1. Remove any encumbering vegetation located adjacent to the project between the two parallel accesses
for approximately 75 to 100 feet to enhance visibility.
2. Add a warning sign located approximately 50 to 75 feet south on the Rolling Sunrise access warning
that the roads merge. The proposed sign, W4-2, is attached. It is recommended that the sign be
placed so that it is visible for both accesses.
Please let me know if further information is required.
Sincerely, ^
Gregary B. Heath,
Attachments
Excerpt Hearing Examiner Report
AASHTO Exhibit 9-55
Kitsap County Assessor Map
MUTCD Sign W1-10 and Sign W4-1
Site Pictures as labeled
2214 Tacoma Road Puyallup WA 98371 (253) 7701401 Fax (253) 770 1473 heathtraffic.com
applicant's verbal agreement to make these upgrades to be formalized within a written stipulation. This
would both provide clarity as to the respective obligations of the City and the applicant and reduce the
potential for future unproductive argument over such elusive legal concepts as appropriate provisions,
regulatory nexus and proportionality.
ORDER
A. The Rolling Sunrise preliminary plat application is REMANDED to City staff for completion of
the following additional review and documentation:
(1). Documentation of the application's compliance with Minimum Requirements I through
10 of the state Department of Ecology's 2005 Stormwater Management Manual for Western
Washington shall be provided, Particular attention should be paid to Minimum Requirement 47
In order to demonstrate the feasibility of the proposed infiltration onsite of 100% of stormwater
runoff, site geotechnical conditions will need to be assessed and all post -development surfaces
modeled. The plat site plan should be revised, as needed, to accurately depict all required
stormwater facilities and their relationship to other plat and relevant offsite development. If
100% of stormwater cannot be infiltrated onsite, downstream flow paths and impacts will need
to be described and assessed.
(2). A limited scope Traffic Impact Assessment shall be performed focused on defining the
sight distance requirements at the locations of the project's two proposed connections to the
City's public road network, assessing whether such requirements will be met under existing
conditions, and proposing mitigations to correct any identified deficiencies.
(3). A written stipulation between the City and applicant shall be negotiated identifying the
various improvements and maintenance activities as proposed within this proceeding for
achieving a minimum of 12 feet in driving width and 13.5 feet of overhead clearance on both
Sunrise Drive and Hyla Avenue; the responsibilities for the implementation of these measures;
and an overall timeline containing applicable deadlines synchronized with the anticipated stages
of plat development (including transport onsite of modular units).
B. The documents described above shall be made publicly available as they are completed, with
copies provided to the Hearing Examiner's Office and to the Eberts' attorney. Upon issuance of the
final required document City staff shall request that the Examiner reopen the public hearing; provided
that, such hearing will not be scheduled to reopen before 30 days after the final required document has
been issued. The Examiner may promulgate a written order in advance of the reopened hearing
restricting testimony to certain specified issues.
ORDERED October 20, 2014.
13tafford L. Smith, Hearing Examiner
City of Bainbridge Island
REMAND ORDER - 6
Intersections
Note: Intersection sight distance shown. is for a stopped passenger car to turn left onto a
two-lane highway with no median and grades 3 percent or less. For other conditions,
the time gap must be adjusted and required sight distance recalculated.
Exhibit 9-55. Design Intersection Sight Distance -Case BI -Left Turn from Stop
i
Sight distance design for left turns at divided -highway intersections should consider multiple
design vehicles and median width. If the design vehicle used to determine sight distance for a
divided -highway intersection is larger than a passenger car, then sight distance for left turns will
need to be checked for that selected design vehicle and for smaller design vehicles as well. If the
divided -highway median is wide enough to store the design vehicle with a clearance to the
through lanes of approximately 1 in [3 ft] at both ends of the vehicle, no separate analysis for the
departure sight triangle for left turns is needed on the minor -road approach for the near roadway
to the left. In most cases, the departure sight triangle for right turns (Case 132) will provide
sufficient sight distance for a passenger car to cross the near roadway to reach the median.
Possible exceptions are addressed in the discussion of Case B3.
If the design vehicle can be stored in the median with adequate clearance to the through
lanes, a departure sight triangle to the right for left turns should be provided for that design
vehicle turning left from the median roadway. Where the median is not wide enough to store the
design vehicle, a departure sight triangle should be provided for that design vehicle to tum left
from the minor -road approach.
The median width should be considered in determining the number of lanes to be crossed.
The median width should be converted to equivalent lanes. For example, a 7.2-m [24 -ft] median
should be considered as two additional lanes to be crossed in applying the multilane highway
adjustment for time gaps in Exhibit 9-54. Furthermore, a departure sight triangle for left tums
661
4.
Metric
US Customary
Intersection sight
Intersection
sight
Stopping
distance for
Stopping
distance for
Design
sight
assen
er cars
Design
sight
passenger
cars
speed
distance
Calculated
Design
speed
distance
Calculated
Design
km/h)
(m)
m
m
mph
ft
ft
ft
20
20
41.7
45
15
80
165.4
170
30
35
62.6
65
20
115
220.5
225
40
50
83.4
85
25
155
275.6
280
50
65
104.3
105
30
200
330.8
335
60
85
125.1
130
35
250
385.9
390
70
105
146.0
150
40
305
441.0
445
80
130
166.8
170
45
360
496.1
500
90
160
187.7
190
50
425
551.3
555
100
185
208.5
210
55
495
606.4
610
110
220
229.4
230
60
570
661.5
665
120
250
250.2
255
65
645
716.6
720
130
285
271.1
275
70
730
771.8
775
75
820
826.9
830
80
910
882.0
885
Note: Intersection sight distance shown. is for a stopped passenger car to turn left onto a
two-lane highway with no median and grades 3 percent or less. For other conditions,
the time gap must be adjusted and required sight distance recalculated.
Exhibit 9-55. Design Intersection Sight Distance -Case BI -Left Turn from Stop
i
Sight distance design for left turns at divided -highway intersections should consider multiple
design vehicles and median width. If the design vehicle used to determine sight distance for a
divided -highway intersection is larger than a passenger car, then sight distance for left turns will
need to be checked for that selected design vehicle and for smaller design vehicles as well. If the
divided -highway median is wide enough to store the design vehicle with a clearance to the
through lanes of approximately 1 in [3 ft] at both ends of the vehicle, no separate analysis for the
departure sight triangle for left turns is needed on the minor -road approach for the near roadway
to the left. In most cases, the departure sight triangle for right turns (Case 132) will provide
sufficient sight distance for a passenger car to cross the near roadway to reach the median.
Possible exceptions are addressed in the discussion of Case B3.
If the design vehicle can be stored in the median with adequate clearance to the through
lanes, a departure sight triangle to the right for left turns should be provided for that design
vehicle turning left from the median roadway. Where the median is not wide enough to store the
design vehicle, a departure sight triangle should be provided for that design vehicle to tum left
from the minor -road approach.
The median width should be considered in determining the number of lanes to be crossed.
The median width should be converted to equivalent lanes. For example, a 7.2-m [24 -ft] median
should be considered as two additional lanes to be crossed in applying the multilane highway
adjustment for time gaps in Exhibit 9-54. Furthermore, a departure sight triangle for left tums
661
4.
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Figure 2C-1. Horizontal Alignment Signs and Plaques
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W1.1 W1.1a W1-2 W1.2a WI.3 VVI -4
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Figure 2C-8. Merging and Passing Signs and Plaques
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