HomeMy WebLinkAbout5.a. Connemara Trail / Dallas Avenue Traffic InvestigationCITY OF ROSEMOUNT
EXECUTIVE SUMMARY FOR ACTION
CITY COUNCIL MEETING DATE: December 15, 1992
AGENDA ITEM: Connemara Trail -Dallas Avenue
AGENDA SECTION:
Traffic Investigation
Old Business
PREPARED BY: Bud Osmundson
Public Works Director
AGENDA fTEm# 5 A
City Engineer/Assistant
ATTACffiMINTS: Letter to OSM; OSM Report;
AP VED BY:
Maps
At the November 3, 1992 regular Council meeting, Council received a
petition from residents along Dallas Avenue to install a stop sign at
Connemara Trail and Dallas Avenue for eastbound traffic on Connemara
Trail. Staff ordered the firm of OSM to perform a traffic study of
this intersection, The City's policy has been to follow the
guidelines from the Manual on Uniform Traffic Control Devices which is
used by Federal and State Traffic Agencies. As OSM's report notes,
the intersection does not meet the guidelines or "warrants" to justify
the installation of a stop sign as requested per this "Manual". The
report recommends, and staff concurs, that a "Blind Intersection" sign
be installed east of Delta Avenue which would warn motorists of the
Dallas intersection.
Chuck Rickart, Traffic Engineer for OSM, will be present at the
meeting to give an overview and answer any questions which may arise.
RECOMMENDED ACTION: MOTION TO DIRECT STAFF TO PLACE A "BLIND
INTERSECTION" SIGN ON CONNEMARA TRAIL EAST OF DELTA AVENUE WARNING
MOTORISTS OF THE DALLAS INTERSECTION.
COUNCIL ACTION:
0
PHONE (612) 423.4411
FAX (612) 4235203
October 30, 1992
(Pity o osemount
2875 - 145th Street West. Rosemount, Minnesota
Mailing Address.
P.O. Box 510, Rosemaurk Minnesota 55068-0510
Mr. Ron Bray
OSM Engineering
300 Park Place Center
5775 Wayzata Blvd
Minneapolis, MN 55416-1228
Dear Mr. Bray:
Y
MAYOR
Edward S. McMenomy
COUNCILMEMBERS
Shoos Klemm
James (Red) Steam
Harry Willcox
Dermis Wiippermann
ADMINISTRATOR
Stephan JQk
The City of Rosemount has received a petition from the residents of Country Hills
Subdivision for the installation of a traffic control device.
Specifically they are looking for a stop sign to be installed for east bound traffic on
Connemara Trail at Dallas Avenue.
This is a "T" intersection with Dallas entering Connemara from the south. Dallas is
a residential street with the statute 30 m.p.h. speed limit. I do not know the ADT.
Connemara is a 4 -lane State Aid Collector street with 35 m.p.h. speed limit. The ADT
on Connemara is 1, 600. Accident history compiled at the time of this writing shows
no accidents.
I would like you and your Staff to review this intersection data and physical
characteristics for control warrants. Based on your review I would like your
professional recommendations for control at this intersection, including warrants or
lack of.
Please contact either Bud or myself with any questions you may have regarding this
matter.
r yr
Ron Wasmund
Public Works Director/Building Official
cc: Bud Osmundson, City Engineer
(Sverylkings (egominq (UC Rosemount!!
November 30, 1992
Mr. Ron Wasmund
Public Works Director
City of Rosemount
2875 145th St. West
Rosemount, MN 55468
0 Orr
SSchelen
Ates, Inc.
300 Park Place Center
5775 Wayzata Boulevard
Minneapolis, MN 55416-1228
612-595-5775
1-800-753-5775
FAX 595-5773
Engineers
Architects
Planners
surveyors
RE: Connemara Trail and Dallas Avenue
OSM Project #5016.00
Dear Mr. Wasmund:
OSM has reviewed the above referenced intersection to determine if multi -way stop sign
control is warranted, as per your request. The data collected included hourly traffic
volume counts, speed data, and accident history. Based on the data collected, this
intersection does not meet the multi -way stop sign warrants as outlined .in the Manual on
Uniform Traffic Control Devices (MUTCD). This is the federal and state guideline for
issues relating to traffic control.
Below is a discussion of each multi -way stop sign warrant and the results of the analysis:
1. Accidents - 5 or more accidents in one year must occur of a type which can be
corrected with a multi -way stop sign installation (i.e., right angle).
No accidents have been reported at the Connemara Trail/Dallas Avenue
intersection of $500 or more in damages since it was constructed.
2. Traffic Volumes f Pedestrians - The following vehicle and pedestrian levels must
be attained in order to meet this warrant.
A. The total volume in the intersection (all approaches added together) must
average 500 vehicles per hour for each of any 8 hours on an average day.
B. And, the combined vehicular and pedestrian volume on the minor
approach (Dallas Avenue) must average at least 200 units for the same 8
hour period.
C. When the 85th percentile exceeds 40 miles per hour on the major street,
the above requirements are reduced by 30%.
The volume warrant is not met at the 35 MPH. Assuming the 85th percentile
speed on Connemara Trail is above 40 miles per hour (posted speed limit is 35
miles per hour), the volume and pedestrian requirement is still not met for any
hour of the day. Attached you will find the hourly traffic volume data collected.
Mr. Ron Wasmund
November 30, 1992
Page 2
Even though multi -way stops are not warranted, it appears that a slight sight distance
problem exists for traffic on Dallas Avenue, viewing traffic eastbound on Connemara
Trail. This is due to the grade on Connemara Trail west of Dallas Avenue. The
measured sight time (i.e., the time the vehicle is spotted to when it enters the
intersection) was 4 to 7 seconds, depending on the approaching vehicle's speed.
Typically, 5 seconds is sufficient time to make a decision to stop or proceed. Based on
this, a discomfort level does exist for the vehicle exiting from Dallas Avenue.
A traffic capacity and level of service (LOS) analysis was conducted at this intersection
to determine if excess delays occur for traffic on Dallas Avenue. The results, which
takes into account the grade (sight restriction)on Connemara Trail west of Dallas
Avenue, indicated that no excess delays occur. In fact, this intersection is operating at a
LOS A, which represents the most efficient movement of traffic.` The capacity and LOS
worksheets are attached.
Based on this information, we would recommend multi -way stops not be installed at this
time. However, we would recommend installing a "blind. intersection' sign on east bound.
Connemara Trail just east of Delta Avenue. It is also recommended that consideration
be given to monitoring and enforcing the speed limit on Connemara Trail. These
measures would help reduce the speed of traffic, thereby giving the traffic on Dallas
Avenue a greater comfort level when pulling out on to Connemara Trail.
Should you have any questions on this matter or require additional information, please
feel free to give me a call at 595-5725.
Sincerely,
ORR-SCHELEN-MAYERON
& ASSOCIATES, INC.
CKF��
Charles Rickart
Traffic Operations Engineer
c: Bud Osmundson - City of Rosemount
Ron Bray - OSM
attachments
bjf
OSM TRANSPORTATION DEPARTMENT
TRAFFIC COUNT DATA
LOCATION
:DALLAS AVE.
SOUTH OF
CONNEMARA
TR.
COUNTY
:DAKOTA
FOR COUNTS
BEGINNING :
November
11,
1992
DATE
9 10
11
12
13
AVE. 14 15 AVERAGE
DA-----------------------------------ITIO
lTUf= .
WEDTU.
__`��I_-__WK.DAY__�SAT.
_SUN_WEEKEND
_ r
PIOURS
12M-11. •-
i
4
1
1..».::n
3
3
- ..
3
`l
r4
.--3
3-4
n
c_
2 ��
n
l-•• 5
r4
r',7
5-6
2�1
21
.i .1.
6-7
57
45
51 _
7-8
.c»
22
17
8-9
23
29
26
9-10
1.6
1.3
17
11-1
27
1911-12N
23 -
1 2N--1.
20
10
15
,..y
23
.�
2 f4
s.
2-3
32
_
34
3-a
28
35
31
4-5
•
-jar
40
39 _
1
32
22
27
0-7
24
19
21.
7-8
15
1.
8-9
13
1.0
1:1.
9-1.0
3
6
4
10-11
;7
3
4
"_
11-12M
3
1
'`
--.._-_------__»»_._--___
TOTALS
--....-__.
--.._..___
282
337
1.43
fir,}
Af--ADT : 41.0
24 HOUR
FACTOR :1
REMARKS _-------_._______.-__--.__..__-._______.__-_._.__---.-_-----..-.-._.._..-___- _.__....--- _---------------------------------------------------------------------------
-
DATA FILE D iLLAS.DQ
_
,
^ -
OSM TRANSPORTATION DEPARTMENT
_
TRAFFIC COUNT DATA
,
`
LOCATION :CONNEMARA TR. EAST OF DALLAS AVE.
-~'
COUNTY :DAKOTA .
FOR COUNTS BEGINNING : November 18, 1992
DATE 16 17
18
19
20
AVE. 21 22 AVERAGE
DAY MON. TUE.
WED.
THU.
FRI.
WK.DAY SAT. SUN. WEEKEND
__________________________________________________________________________
HOURS
12M-1
11
2
6
-
1-2 ` "�
6
6
2_3
3
2
2
3-4
5
3
4
4_5
19
16
17
5-6
8O
65
72
6-7
182
178
180
�
7_8
11 u
100
166
8-9
126
136
131
9-10,
65
77
71
10-11
101
73
87
11-1214
99
94
96
12N-1
73
92
82
1-2
127
110
118
2-3
181
159
170
3-4
191
206
198
4-5
160
170
165
5-6
135
120
127
6-7
109
110
109
7-8
98
86
92
8-9
66
64
65
9-10
33
36
34
10-11
12
18
15
11-1211
6
11
8
-----_------------_---_--_-__-_--___-----_--____--__-__-------____--__-__-
TOTALS
1582
1975
372
1967
AADT : 1967
24 HOUR FACTOR :1
REMARKS: _____________-_---_-----_________________________----_--___--__-
`
DATA FILE' CO1A-DAL.DAl
1985 HCM:- UNSIGNALIZED INTERSECTIONS Page -1
ttttxttttittttlitttttiitttt22ttt2ttitttttttttttttttttttttttttttttittt
IDENTIFYING INFORMATION
AVERAGE RUNNING SPEED, MAJOR STREET.. 40
PEAKHOUR FACTOR ..................... .9
AREA POPULATION ...................... 25000
NAME OF THE EAST/WEST STREET......... CONNEMARA TRAIL
NAME OF THE NORTH/SOUTH STREET....... DALLAS AVE.
NAME OF THE ANALYST .................. CTR
DATE OF THE ANALYSIS (aa/dd/yy)...... 11/25/95
TIME PERIOD ANALYZED ................. AM PEAK HOUR
OTHER INFORMATION....
INTERSECTION TYPE AND CONTROL
---------------------------------------------------------------------
INTERSECTION TYPE:"T-INTERSECTION
MAJOR STREET DIRECTION: EAST/WEST
CONTROL TYPE NORTHBOUND: STOP SI6N
TRAFFIC VOLUMES
EB WB NB SB
---- ---- ---- ----
LEFT 0 - 5 33
THRU 72 108 0 --
RIGHT 5 0 8 --
NUMBER OF LANES
--------------------------------------------------------------------
EB WB NB SB -
------- ------- ------- -------
LANES 2 2 1 --
ADJUSTMENT FACTORS Page -2
PERCENT RIGHT TURN CURB RADIUS (ft) ACCELERATION LANE
GRADE ANGLE FOR RI6HT TURNS FOR RIGHT TURNS
EASTBOUND 4.00 90 20 N
WESTBOUND 0.00 90 20 N
NORTHBOUND 0.00 90 20 N
SOUTHBOUND ---- --- --- -
VEHICLE COMPOSITION
I SU TRUCKS I COMBINATION
AND RV'S VEHICLES I MOTORCYCLES
EASTBOUND 2 1 2
WESTBOUND 2 1 2
NORTHBOUND 0 0 2
SOUTHBOUND --- --- ---
CRITICAL SAPS
TABULAR VALUES
ADJUSTED
SIGHT DIST.
FINAL
(Table 10-2)
VALUE
ADJUSTMENT
CRITICAL SAP
MINOR RIGHTS
NB 5.90
5.90
0.00
5.90
MAJOR LEFTS
WB 5.70
5.70
0.00
5.70
MINOR LEFTS
NB 7.60
7.60
0.00
7.60
IDENTIFYING
INFORMATION
---------------------------------------------------------------------
NAME OF THE
EAST/WEST STREET...... CONNEMARA TRAIL
NAME OF THE
NORTH/SOUTH STREET....
DALLAS
AVE.
DATE AND TIME OF THE ANALYSIS.....
11/25/95 ; AM PEAK
HOUR
OTHER INFORMATION....
CAPACITY AND LEVEL -OF -SERVICE Page -3
----- ---------------«------- ----- ----------- ----------------
x. �_�,
POTEN- ACTUAL
FLOW- TIAL MOVEMENT SHARED RESERVE
RATE CAPACITY CAPACITY CAPACITY CAPACITY
MOVEMENT v(pcph) c (pcph) c (pcph) c (pcph) c = c - v LOS
p M SH R SH
MINOR STREET
NB LEFT 36 595 593 ) 593 > 551 > A
> 641 > 596 >A
RIGHT 9 964 964 > 964 > 955 > A
MAJOR STREET
WB LEFT 6 962 962 962 956 A
IDENTIFYING INFORMATION
NAME OF THE EAST/WEST STREET...... CONNEMARA TRAIL
NAME OF THE NORTH/SOUTH STREET.... DALLAS AVE.
DATE AND TIME OF THE ANALYSIS..... 11/25/95 ; AM PEAK HOUR
OTHER INFORMATION....
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