Item D11 D71
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County of Monroe
�y,4 ' ?, "tr, BOARD OF COUNTY COMMISSIONERS
Mayor Michelle Coldiron,District 2
�1 nff `_ll Mayor Pro Tem David Rice,District 4
-Ile Florida.Keys Craig Cates,District 1
Eddie Martinez,District 3
w � Holly Merrill Raschein,District 5
County Commission Meeting
October 203, 2021
Agenda Item Number: D.11
Agenda Item Summary #9796
BULK ITEM: Yes DEPARTMENT: Engineering/Roads
TIME APPROXIMATE: STAFF CONTACT: Judith Clarke (305) 295-4329
NA
AGENDA ITEM WORDING: Approval to install STOP signs on 2nd Street on Stock Island at the
intersection of 2nd Street and 2nd Avenue to create a 4-way stop condition instead of the current 2-
way Stop condition.
ITEM BACKGROUND: F.S. 316.006 (3)(a) grants counties jurisdiction to place and maintain
traffic control devices upon all streets and highways under their original jurisdictions.
In response to a request from a resident and based on inspection by Engineering staff, Monroe
County's traffic engineering consultant performed a traffic study to determine whether installing
STOP signs on the two (north-south) legs of 2nd Street at the intersection with 2nd Avenue on Stock
Island to create a 4-way Stop condition was warranted. Currently, there are STOP signs on the east-
west legs of 2nd Avenue. The intersection is in a crowded mixed residential/commercial area with on
street parking, and there is a pre-school and a school bus stop in the vicinity of the intersection.
The traffic study was performed in accordance with the Manual of Uniform Traffic Control Devices
(MUTCD) Multi-Way Stop Sign Warrant Analysis. The results indicated that the intersection did
not meet any of the four criteria for installation of a multi-way stop control; however, it was noted
that due to the intersection geometry and heavy on street parking the sight distance at the intersection
is restricted, which is a condition that may also be considered when evaluating whether to install a
STOP sign.
In order to correct the sight distance the traffic engineering consultant recommended 1) eliminating
on street parking so that sight triangles at the intersection remain clear or 2) installing STOP signs to
create a 4-way stop condition instead of the current 2-way stop condition. Since residents need on
street parking and already find it challenging to park in some areas staff is recommending installing
STOP signs rather than eliminating on street parking.
PREVIOUS RELEVANT BOCC ACTION: none
CONTRACT/AGREEMENT CHANGES:
NA
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D71
STAFF RECOMMENDATION: Approval to install STOP signs on two legs of 2nd Street at the
intersection with 2nd Avenue
DOCUMENTATION:
Stop Sign Warrant 2St-2Ave attachment
FINANCIAL IMPACT:
Effective Date:
Expiration Date:
Total Dollar Value of Contract:
Total Cost to County:
Current Year Portion:
Budgeted:
Source of Funds:
CPI:
Indirect Costs:
Estimated Ongoing Costs Not Included in above dollar amounts:
Revenue Producing: If yes, amount:
Grant:
County Match:
Insurance Required:
Additional Details:
None
REVIEWED BY:
Judith Clarke Completed 09/27/2021 4:14 PM
Christine Limbert Completed 09/28/2021 12:51 PM
Purchasing Completed 09/28/2021 1:01 PM
Budget and Finance Completed 09/28/2021 2:29 PM
Maria Slavik Completed 09/28/2021 3:28 PM
Liz Yongue Completed 10/01/2021 10:10 AM
Board of County Commissioners Pending 10/20/2021 9:00 AM
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Table of Contents
Listof Figures........................................................................................................... i
Listof Tables............................................................................................................ i
1 Project Overview ............................................................................................... 1
1.1 Introduction ................................................................................................. 1
1.2 Study Methodology 1 '
2 Existing Conditions............................................................................................ 3
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3 Field Review ...................................................................................................... 4
4 Traffic Data...................................................................................................... 10 >
4.1 Turning Movement and Pedestrian Counts................................................ 10
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4.2 Intersection Delay Studies 11
5 Crash Analysis................................................................................................. 12 -
6 Multi-Way Stop Sign Warrant Analysis............................................................. 12
7 Local Coordination........................................................................................... 15 =
8 Conclusions and Recommendations................................................................ 15
List of Figures
Figure1: Project Location Map ............................................................................... 2 >
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List of Tables
Table 1: Summary of Peak Hour Turning Movement Counts (511912021) .............. 10
Table 2: Summary of Twelve-Hour Turning Movement Counts (511912020) .......... 10
Table 3: Summary of Delay Stud 2nd Avenue Eastbound 11
Table 4: Summary of Delay Study - 2nd Avenue (Westbound)................................ 11 0.
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Table 5: Multi-way Stop Sign Control Analysis Results......................................... 14
Appendix
Appendix A: Citizen Request
Appendix B: Existing Condition Diagram
Appendix C: Turning Movement Counts
Appendix D: Delay Study Results
Appendix E: Sight Distance Analysis
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Four-Way Stop Sign Warrant Study
2nd Street at 2nd Avenue, Stock Island, FL
1 Project Overview
1.1 Introduction
The Monroe County Engineering Services Department has retained AECOM Technical Services, Inc.
(AECOM) to conduct a traffic study at the intersection of 2nd Street and 2nd Avenue in Stock Island,
Monroe County, Florida (see Figure 1). This study was initiated in response to a request from a
concerned citizen. The citizen suggested that this intersection be converted from a two-way stop
controlled intersection to a four-way stop controlled intersection (see Appendix A). The purpose of this
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study is to review the existing conditions, traffic volumes, crash data, and MUTCD criteria to make
recommendations regarding the need to convert the study intersection to a four-way stop controlled
intersection.
1.2 Study Methodology CL
This traffic study is being completed in accordance with Work Order No. 14. The tasks completed by _
AECOM as part of this study include:
• Turning Movement Counts
• Delay Study
• Crash Data Review
• Existing Condition Diagram
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• Field Reviews
• Sight Distance Assessment
• Multi-way Stop Sign Warrant Analysis -
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The following sections of this report summarize the findings and results of the analyses conducted as
part of this study.
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Four-Ways Stop Sign Warrant Analysis Project Location Map Figure 1
2 Street and 2nd Avenue
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2nd Street at 2nd Avenue, Stock Island, FL
2 Existing Conditions
The intersection of 2nd Street and 2nd Avenue is an unsignalized, two-way stop controlled intersection
with Stop signs on the east and west legs. Within the limits, both 2nd Street and 2nd Avenue are two-
lane undivided urban minor roadways. 2nd Street is a north/south roadway and 2nd Avenue is an
east/west roadway. At the study intersection, all four approaches include one shared through/left-
turn/right-turn lane. There are no sidewalks along 2nd Avenue or 2nd Street and no crosswalks exist at
the intersection. There are no bicycle facilities in the vicinity of the intersection. A school bus stop
exists on 2nd Avenue approximately 280 feet east of the study intersection. Also, "Slow Watch for
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Children" signs exist facing eastbound and westbound traffic approaching the school bus stop on the >
east leg. No speed limit signs were observed along 2nd Avenue or 2nd Street. As such, the speed limit
is assumed to be 25 mph (Per County Ordinance Section 25-2). One-sided street lighting exists
along the west leg (south side) and south leg (west side) and one light pole exists on the southeast
corner of the study intersection. The land uses surrounding the study intersection include both CL
residential and commercial developments. A condition diagram showing the existing conditions is °®
included in Appendix B.
Based on visual inspection, the pavement surface and signs within the study limits are generally in
good conditions. However, the pavement markings (lane lines and stop bars) were observed to be E
faded along both 2nd Avenue and 2nd Street.
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2nd Street at 2nd Avenue, Stock Island, FL
3 Field Review
Field reviews were conducted on May 27, 2021 by qualified traffic engineers during the mid-day
and the evening peak periods to observe the existing conditions. The following is a summary of
field observations.
• Traffic volumes on 2nd Avenue were observed to be pretty light but steady with a maximum
queue of two vehicles.
• Some pedestrian and bicycle activity was observed, with more activity during the mid-day
than the evening period.
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• Bicycles traveling along both 2nd Avenue and 2nd Street were observed to use the full lane.
On one occasion, an eastbound motorist was observed to stop abruptly to yield to a
southbound bicyclist. y
• Vehicles parked along 2nd Street were overserved to restrict the sight distance forCL
eastbound and westbound motorists stopped at the study intersection (see Photo 1 and
Photo 2). _
• There is slight shift in roadway alignment to the west along 2nd Street in the vicinity of the
study intersection. This shift combined with on-street parking along 2nd Street restricts the
southbound motorist's view of eastbound and westbound vehicles stopped at 2nd Avenue
(see Photo 3). A similar sight restriction exists for northbound motorists approaching 2nd
Avenue, with a restricted view of stopped westbound vehicles (see Photo 4).
• Two school buses were observed stopping (approximately 3:00-3:30pm) to let school cv
children off at the school bus stop on 2nd Avenue (see Photo 5). The first bus had three i
children get off and the second bus had more than 10 children get off. Some of the
children walked towards the study intersection while others walked in other directions.
• A preschool is located east of the study intersection. Some adults with kids were observed
walking in the vicinity of the intersection (see Photo 6). 0.
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• During field observations we spoke to the concerned citizen that made the original request
for four-way stop control at this intersection. Below is a summary of the input he provided.
o The citizen lives on the southeast corner of the intersection, he regularly observes
potential conflicts (see Photo 7) and was almost hit by a vehicle that traveled off
the road due to the impact of an angle crash at the study intersection.
o He stated that he is a Key West police officer, certified in visual speed estimation,
and sees vehicles traveling up to 45 mph on 2nd Street.
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2nd Street at 2nd Avenue, Stock Island, FL
o The citizen also stated that he has made requests to the Monroe County Sherriff's
Office for spot enforcement at the intersection but is aware that the Sheriff's Office
is short staffed so regular enforcement on this minor road is very limited.
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Study Photographs
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Photo 1: Looking north from the EB stop bar— Parked vehicles restrict the view of approaching
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Photo 2: Looking south from the WB stop bar—Parked vehicles restrict the view of approaching
traffic
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Photo 3: Looking south from 2"1 Street approaching 2"1 Avenue— Parked vehicles restrict the y
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Photo 4: Looking north on 2"d Street approaching 2"d Avenue— Parked vehicles restrict the view
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Photo 5: School Bus Stopped on 2nd Avenue East of 2nd Street
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Photo 6: Pedestrians (adult with child)walking westbound at the study intersection
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Photo 7: Southbound motorist stopped for an eastbound right-turn vehicle that didn't yield.
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Four-Way Stop Sign Warrant Study
2nd Street at 2nd Avenue, Stock Island, FL
4 Traffic Data
4.1 Turning Movement and Pedestrian Counts
Turning movement counts (TMCs) were collected by Atlantic Engineering Services. Inc. on
Wednesday, May 19, 2021, for the 12-hour period from 7:00am to 7:00pm. The northbound and
southbound through traffic were the heaviest movements with an average of 40 vehicles per hour
in each direction. The peak-hour and eight-hour TMCs are summarized in Table 1 and Table 2,
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respectively. The complete TMCs are included in Appendix C.
Table 1: Su mma of Peak Hour Turning Movement Counts (5/19/2021) >
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7:30AM to 8:30 AM 6 47 14 0 14 8 6 5 8 59 4 4 3 16 9 0
4:15 PM to 5:15 PM 5 68 12 3 7 18 12 3 5 60 10 1 4 17 8 9 CL
Note: R— Right-turn; T —Through; L— Left-turn; U — U-turn; P — Pedestrian
Table 2 Summary of Twelve-"53
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7:00 AM to 8:00 AM 2 37 13 0 7 52 3 1 3 13 11 0
8:00 AM to 9:00 AM 7 30 9 0 18 10 7 4 8 40 2 3 4 15 11 0
9:00 AM to 10:00 AM 3 32 5 0 8 10 4 2 5 32 2 0 0 14 6 0
10:00 AM to 11:00 AM 5 44 4 0 4 10 4 1 3 22 4 0 6 8 9 0
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11:00 AM to 12:00 PM 8 35 3 0 7 5 5 7 4 36 3 1 3 10 3 0 i
12:00 PM to 1:00 PM 13 55 5 4 5 11 2 4 5 43 5 1 6 8 5 3
1:00 PM to 2:00 PM 7 33 5 1 6 14 5 6 2 35 4 1 4 14 7 10
2:00 PM to 3:00 PM 3 32 5 0 5 10 1 2 1 39 5 3 3 7 8 4
3:00 PM to 4:00 PM 14 61 8 0 3 8 11 5 3 37 1 0 2 9 10 7
4:00 PM to 5:00 PM 7 62 12 1 6 15 10 3 3 52 7 0 3 15 8 7
5:00 PM to 6:00 PM 7 44 9 5 5 10 5 4 5 51 4 1 2 9 12 9
6:00 PM to 7:00 PM 3 31 2 6 1 3 1 1 0 31 1 0 4 5 2 3
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Four-Way Stop Sign Warrant Study
2nd Street at 2nd Avenue, Stock Island, FL
4.2 Intersection Delay Studies
Delay studies were conducted during the afternoon (3:15 pm to 4:15 pm) on May 27, 2021 to
measure delays experienced by eastbound and westbound vehicles during peak hours. The delay
study reports are included in Appendix D.
A summary of the delay data for the eastbound and westbound traffic is presented in Table 3 and
Table 4, respectively. The eastbound vehicles experienced higher total delay than the westbound
vehicles. The average delay was pretty comparable for both directions, with average delays of
3.59 seconds and 3.42 seconds for eastbound and westbound vehicles, respectively. Eastbound
vehicles experienced a maximum delay of 26 seconds and the westbound vehicles experienced >
a maximum delay of 10 seconds. Based on the Highway Capacity Manual, the unsignalized
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intersection delays translate to Level of Service (LOS) A for eastbound and westbound vehicles.
Table 3: Summary of Delay Study—2"d Avenue (Eastbound) N
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Average Stopped Time (Seconds) 3.59
Maximum Stopped Time (Seconds) 26
Maximum Queue(Vehicles) 1
Delay in Vehicle Hour 0.03 °3
Total Delay (Seconds) 122
Level of Service A
Table 4: Summary of Delay Study—2"d Avenue (Westbound)
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Average Stopped Time (Seconds) 3.42
Maximum Stopped Time (Seconds) 10
Maximum Queue (Vehicles) 2
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Delay in Vehicle Hour 0.03 c
Total Delay (Seconds) 113
Level of Service A °3
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2nd Street at 2nd Avenue, Stock Island, FL
5 Crash Analysis
Signal Four Analytics was used to search for crash data at the study intersection during the period
from January 1, 2015 to August 1, 2021, which indicated two crashes at the study intersection.
However, upon further review of crash reports both of these crashes had not actually occur at the
study intersection. As a follow-up, AECOM contacted the Monroe County Sheriff's Office to
acquire any crash records they may have. The Monroe County Central Records Department
responded to AECOM's request and provided the CAD calls for incidents along 2nd Avenue and
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2nd Street. The information provided indicated one potential traffic incident at the study intersection
from 2014 to 2018. This appeared to be a vehicle vs. pedestrian incident that occurred at 9:10 am
on October 04, 2015. Additionally, the concerned citizen that made the request, provided video of
an angle crash that occurred when an eastbound vehicle failed to stop at the stop sign and was
struck by a southbound vehicle. Details of this angle crash were not found in any of the crash
databases AECOM searched. CL
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6 Multi-Way Stop Sign Warrant Analysis
The Manual on Uniform Traffic Control Devices (MUTCD) is the national standard published
by the FHWA that defines the use and application of traffic control devices. The MUTCD
(2009 Edition) states:
"Multi-way stop control can be useful as a safety measure at intersection if certain traffic
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conditions exist. Safety concerns associated with multi-way stops include pedestrians,
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bicycles, and all road users expecting other road users to stop."
The guidance provided in the MUTCD for when a multi-way stop control should be used
includes the four criteria provided below. Table 5 provides a summary of the analysis results
based on these criteria. 0.
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A. Where traffic control signals are justified, the multi-way stop is an interim measure that
can be installed quickly to control traffic while arrangements are being made for the E
installation of the traffic control signal.
B. Five or more reported crashes in a 12-month period that are susceptible to correction
by a multi-way stop installation. Such crashes include right-turn and left-turn collisions
as well as right-angle collisions.
C. Minimum volumes:
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Four-Way Stop Sign Warrant Study
2nd Street at 2nd Avenue, Stock Island, FL
1. The vehicular volume entering the intersection from the major street
approaches (total of both approaches) averages at least 300 vehicles per hour
for any 8 hours of an average day; and
2. The combined vehicular, pedestrian, and bicycle volume entering the
intersection from the minor street approaches (total of both approaches)
averages at least 200 units per hour for the same 8 hours, with an average
delay to minor-street vehicular traffic of at least 30 seconds per vehicle during
the highest hour; but
3. If the 85th-percentile approach speed of the major-street traffic exceeds 40
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mph, the minimum vehicular volume warrants are 70 percent of the values >
provided in Items 1 and 2.
D. Where no single criterion is satisfied, but where Criteria B, C.1, and C.2 are all satisfied
to 80 percent of the minimum values. Criterion C.3 is excluded from this condition.
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The results of the analysis provided in Table 5 indicate that the study intersection does not
meet any of the MUTCD criteria associated with crash data and traffic volumes for installation —
of multi-way stop control. In addition to the four criteria discussed, the MUTCD mentions other
criteria that may be considered when conducting a multi-way stop control evaluation
including: E
1) The need to control left-turn conflicts.
2) The need to control vehicle/pedestrian conflicts near locations that generate high >
pedestrian volumes.
3) Locations where a road user, after stopping, cannot see conflicting traffic and is not i
able to negotiate the intersection unless conflicting cross traffic is also required to stop.
4) An intersection of two residential neighborhood collector (through) streets of similar
design and operating characteristics where multi-way stop control would improve0.
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traffic operational characteristics of the intersection.
During the field observations it was noted that the sight distance is restricted due to vehicles
parked along 2nd Street north and south of the study intersection. A further review of the sight
distance requirements for two-way stop controlled intersections showed that the existing on-
street parking is within the clear sight triangles. Sight distance analysis sketches are provided
in Appendix E. Based on this analysis; it appears that multi-way stop control could be
considered if the sight distance restrictions cannot be removed.
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Four-Way Stop Sign Warrant Study
2nd Street at 2nd Avenue, Stock Island, FL
7 Local Coordination
As part of the agency coordination effort for this study, AECOM contacted the Monroe County
Sheriff's Office and the Monroe County School Board. A summary of the input received is provided
below:
• AECOM called Major Chad Scibilia from the Monroe County Sherriff's Office, who
suggested we contact the traffic Sergeant Greg Korzen. AECOM spoke with Sergeant
Korzen on the phone, he stated that the sight distance is a concern at this intersection
and that there is pretty heavy bicycle traffic through this area.
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AECOM called Randy Fabal of the Monroe County School Board. Randy confirmed the
school pick-up and drop-off times and location of the School Bus Stop.
8 Conclusions and Recommendations
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Based on the findings of the analyses conducted as part of this study, which included a review of
crash data, turning movement counts, delay studies, field reviews, and four-way stop control
warrant analysis, the following improvements are suggested for Monroe County's consideration:
1) The results of the analysis as mentioned in Section 6 indicate that the study intersection
does not meet any of the MUTCD criteria associated with crash data and traffic volumes
for installation of multi-way stop control. However, the study intersection has restricted
sight distance due to parked vehicles, which is one of the MUTCD considerations for a
four-way stop control. Therefore, two options are suggested for implementation:
a) Implement four-way stop control. Considering the proximity of a school bus stop and
a preschool (which generate pedestrian traffic including children) the four-way stop
control may be beneficial to enhance safety. Per AASHTO Green Book Section
9.5.3.5, the stop bars should be placed such that the first stopped vehicle on one _
approach is visible to the drivers of the first stopped vehicles on each of the other0.
approaches.
b) Remove on-street parking to provide clear sight distance.
2) In addition, consider implementing the following signing and marking enhancements:
a) Refurbish pavement markings (lane lines, stop bars, STOP markings, and edge lines)
b) Install reflective sheeting on the Stop sign support facing eastbound traffic to enhance
its visibility during nighttime.
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