INFORMATION 12-05-2011December 201 I
Meetzng Calendar
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Nov 2011 Jan 2012 1 2 3
S M T W T F S S M T W T F S
1 2 3 4 5 1 2 3 4 5 6 7
6 7 8 9 10 11 12 8 9 10 11 12 13 14
13 14 15 16 17 18 19 15 16 17 18 19 20 21
20 21 22 23 24 25 26 22 23 24 25 26 27 28
27 28 29 30 29 30 31
4 S 6 7 8 9 1 0
6:00 PM City
Council Closed
Session 12:00 PM -3:00
PM Downtown
Holiday
Celebration
6:30 PM City
Council
11 12 1 3 14 IS 16 17
4:30 PM Special
HRA
5:30 PM EDA 3:30 PM Utilities
Commission @
ERMU 6:30 PM Parks
and Recreation
Commission 6:00 PM HPC
6:30 PM City
Council
7:00 PM School
6:30 PM
Planning
Commission
Board
18 19 20 21 22 23 24
6:30 PM City
Council 8:30 AM Energy
City
Commission
25 26 27 28 29 30 31
6:30 PM
Downtown Task
Force
7:00 PM School 6:30 PM
Planning
Commission
Workshop
Board
INFORMATION
MEMORANDUM
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TO: Mayor and City Council
FROM: Justin Femrite P.E., City Engineer
DATE: December 5, 201 1
SUBJECT: CR 12, CR 13, and Twin Lakes Road Intersection Review
At the November 14, 2011, City Council meeting, staff was instructed to review the traffic
volumes and accident history at the intersection of CR 12, CR 13, and Twin Lakes Road to
determine if the intersection would meet warrants for a traffic control system.
Traffic control systems are evaluated against eight different warrants as detailed in the
Minnesota Manual on Traffic Control Devices. These warrants are really limits of high
traffic or pedestrian volumes, delay, or accident history that would justify the consideration
of a traffic control system. A full intersection evaluation was last completed on this
intersection in 2006. Attached you will find a summary of the 2006 evaluation. In 2006, the
intersection did not meet any of the prescribed warrants to justify a traffic control system.
In 2008, the Sherburne County Public Works Department again reviewed the traffic
movements at the intersection. It was shown through their counts in 2008 that the traffic
volumes had decreased from the counts in 2006. This decrease in volume subsequently
resulted in the county stopping the full evaluation because it was clear the traffic volume
warrants would not be met for the installation of a traffic control system at that time.
Staff reviewed the traffic volumes for the intersection with Sherburne County staff again.
The counts reviewed were completed by the Minnesota Department of Transportation.
These counts are completed every three years and were reported for 2007 and 2010. There
was a slight (< 5%) volume increase on two of the legs of the intersection and a decrease on
the other two. These minor changes are unlikely to change the results of the traffic or
pedestrian volume warrants for the intersection at this time.
Four motor vehicle collision accidents have been reported at this intersection over the last
12-month period. Only two of these accidents, including the accident on November 14,
2011, involved a motorist not seeing or failing to yield to another driver. Neither of those
two accidents resulted in personal injury. The accident history at this intersection does not
meet the warrant for the installation of a traffic control system.
At this time staff is not recommending a change to the intersection control at this location.
We will continue to watch the traffic levels and accident occurrences at this location to
determine if something different should be considered in the future. If you have any
questions on the above information please call me at 763-635-1051.
N:\Public Bodies\Ciry Council\Council RCA\Agenda Packet\12-05-2011\Tnffic Warrants.docx
Signal Warranfs -Summary
Sherburne County
Public Works
763-241-7000
Major Street Approaches
Eastbound: CSAH 12
Number of Lanes: 2
Approach Speed: 40
Total Approach Volume: 3,673
Westbound: CSAH 12
Number of Lanes: 2
Approach Speed: 40
Total Approach Volume: 3,612
Minor Street Approaches
Northbound: Twin Lakes Road
Number of Lanes: 2
Total Approach Volume: 1,814
Southbound: CSAH 13
Number of Lanes: 2
Total Approach Volume: 1,232
Warrant Summary (Urban values apply.)
Warrant 1 -Eight Hour Vehicular Volumes ............................................................................................ Not Satisfied
Warrant 1A -Minimum Vehicular Volume .........................................................................................Not Satisfied
Required volumes reached for 3 hours, 8 are needed
Warrant 1 B -Interruption of Continuous Traffic .............................................................................. Not Satisfied
Required volumes reached for 0 hours, 8 are needed
Warrant 1 A&B -Combination of Warrants ......................................................................................Not Satisfied
Required volumes reached for 3 hours, 8 are needed
Warrant 2 -Four Hour Volumes .............................................................................................................. Not Satisfied
Number of hours (1) volumes exceed minimum < minimum required (4).
Warrant 3 -Peak Hour ............................................................................................................................. Nat Satisfied
Warrant 3A -Peak Hour Delay ...........................................................................................................Not Satisfied
Total approach volumes and delays on minor street do not exceed minimums for any hour.
Warrant 3B -Peak Hour Volumes ......................................................................................................Nat Satisfied
Volumes do not exceed minimums for any hour.
Warrant 4 -Pedestrian Volumes ............................................................................................................. Not Satisfied
Required 4 Hr pedestrian volume reached for 0 hour(s) and the single hour volume for 0 hour(s)
Warrant 5 -School Crossing ................................................................................................................... Not Satisfied
Number of gaps > .0 seconds (0) exceeds the number of minutes in the crossing period (0).
Warrant 6 -Coordinated Signal System ................................................................................................. Not Satisfied
No adjacent coordinated signals are present ,
Warrant 7 -Crash Experience ................................................................................................................. Not Satisfied
Number of accidents (1) is less than minimum (5). Volume minimums are not met.
Warrant 8 -Roadway Network ................................................................................................................ Not Satisfied
Major Route conditions not met. One or more volume requirement met.
Signal Warrants -Summary
700
2
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U
N
a 500
a
Q
a~
~ 400
0
L
t 300
_rn
200
°c 100
r ~
Warrant Curves
~° ~~~°~°-~ - ~ Peak Hour Warrant
Four Hour Warrant
[Urban, 2+ major lanes and 2+ minor lanes curves u:
1
d
Sherburne County
Public Works
763-241-7000
E
400 600 800 1000 1200 1400 1600 1800
Major Street -Total of Both Directions (VPH)
0 200
Analysis of 8-Hour Volume Warrants:
Hour
.Begin Major
Total Higher Minor
Vol Dir
Major Crit War-1A
Minor Crit
Meets?
Major Crit War-16
Minor Crit
Meets?
Major Crit War-1A88
Minor Crit
Meets?
00:00 0 0 NB 600-No 200-No -- 900-No 100-No -- 720-No 160-No ---
01:00 0 0 NB 600-No 200-No -- 900-No 100-No -- 720-No 160-No --
02:00 0 0 NB 600-No 200-No -- 900-No 100-No -- 720-No 160-No --
03:00 0 0 NB 600-No 200-No -- 900-No 100-No -- 720-No 160-No --
04:00 0 0 NB 600-No 200-No -- 900-No 100-No -- 720-No 160-No --
05:00 0 0 NB 600-No 200-No -- 900-No 100-No -- 720-No 160-No ---
06:00 500 119 SB 600-No 200-No -- 900-No 100.Yes Minor 720-No 160-No --
07:00 720 160 SB 600-Yes 200-No Major 900-No 100-Yes Minor 720-Yes 960-Yes ..Both
08:00 494 97 SB 600-No 200-No -- 900-No 100-No --- 720-No 160-No
09:00 410 76 SB 600-No 200-No -- 900-No 100-No -- 720-No 160-No --
10:00 389 80 NB 600-No 200-No -- 900-No 100-No - 720-No 160-No
11:00. 417 107 NB 600-No 200-No -- 900-No 100-Yes Minor 720-No 160-No --
12:00 417 120 NB 600-No 200-No - 900-No 900-Yes Minor 720-No 160-No --
13:00 446 104 NB 600-No 200-No -- 900-No 100-Yes Minor 720-No 160-No ---
14:00 523 112 NB 600-No 200-No -- 900-No 100-Yes Minor 720-No 160-No --
.15:00 688 171 NB 600-Yes'' 200-No Major 900-No 100-Yes Minor 720-No 160-Yes Minor
16:00 731 291 NB 600-Yes 200.Yes Both 900-No 100-Yes Minor 720-Yes 160-Yes Both
17:00 744 311 N B 600-Yes 200-Yes Both 900-No 100-Yes Minor 720-Yes 160-Yes Both
18:00 650 207 N B 600-Yes 200-Yes Both 900-No .100-Yes Minor 720-No 160-Yes Minor
19:00 156 35 NB 600-No 200-No -- 900-No 100-No -- 720-No 760-No --
20:00 0 0 NB 600-No 200-No -- 900-No 100-No -- 720-No 160-No --
21:00 0 0 NB 600-No 200-No -- 900-No 100-No - 720-No 160-No --
22:00 0 0 NB 600-No 200-No -- 900-No 100-No -- 720-No 160-No --
23:00 0 0 NB 600-No 200-No -- 900-No 100-No - 720-No 160-No --