HomeMy WebLinkAboutFairgrounds to SAHS Options PowerPointCounty Highway 15 (Stillwater Blvd)
Access Planning and Traffic Control
Lake Elmo City Council Workshop
March 8th, 2016
Joe Gustafson PE, PTOE
Traffic Engineer
Washington County Public Works
joe.gustafson@co.washington.mn.us
County Highway 15
2
Corridor Timeline
•Fatal rear-end crash at 50th St. in 2002
•Center left turn lanes added in 2009
–Zero verifiable injury crashes since then.
•MnDOT “turned back” to County in 2015
•Realignment project planned for 2018
•Future 4-Lane divided corridor
3
CSAH 15 Corridor Issues
•Average Daily Traffic 18,000 – 23,000.
•Busiest 2-lane County Highway in
Washington County
•Long delays to make left turns onto
CSAH 15 during peak times.
•Cross streets have very low volumes,
below established signal warrants.
•Cross streets are not connected to each
other, not aligned.
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Signal Considerations
•Signals are NOT safety devices.
–Crash rates normally increase overall.
•Signals are right-of-way assignment
devices.
–Maximum delays become capped, but
delays become higher overall.
•Construction costs are split by leg.
•Operating costs are shared.
•Turn lanes are normally required
5
Signal Considerations
•Signal warrants thresholds not met at
any of the intersections.
•Left turn delays are high at all of the
intersections.
•Not realistic to signalize each
intersection in the corridor.
•If a signal is installed, need to prioritize.
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Unsignalized Intersections
•55th Street
•53rd Street / Marquess
•50th Street
•Linden Trail / McDonald Drive
•Private driveways
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8
55th St N
53rd / Marquess
50th St N
McDonald/Linden
55th Street
•Serves OPH commercial area
•Serves Post Office Annex
•Serves Marquess neighborhood
•Serves Carriage Station office complex
•Does not serve any parcels on east side
•298 vehicles made left turns 6am-7pm
–Maximum: 40 vehicles during 7am-8am
hour.
9
10
55th St N
53rd / Marquess
50th St N
McDonald/Linden
53rd / Marquess
•Serves Marquess neighborhood
•Serves St. John’s Church
•53rd serves large area of Baytown Twp.
•Connectivity to 55th Street
• 113 vehicles made left turns 6am-7pm
–Maximum: 13 left turns vehicles 6am-7am
–13 left turns again during 9am-10am (tied).
11
12
55th St N
53rd / Marquess
50th St N
McDonald/Linden
50th Street
•Municipal State Aid street
•Continuous to Lake Elmo Ave (CR 17)
•Serves relatively few neighborhoods
•Does not serve any parcels on east side
•162 vehicles made left turns 6am-7pm
–Maximum: 20 vehicles during 5pm-6pm
hour.
13
14
55th St N
53rd / Marquess
50th St N
McDonald/Linden
Linden / McDonald
•Serves large area of Baytown Twp
•Serves Linden Trail neighborhood
•Serves 50th Street, but only by way of
Linden Trail.
•76 vehicles made left turns 6am-7pm
–Maximum: 13 vehicles during 7am-8am
hour.
15
16
55th St N
53rd / Marquess
50th St N
McDonald/Linden
17
55th St N
53rd / Marquess
50th St N
McDonald/Linden
298
113
162
76
Daily Left Turn Volumes
18
55th St N
53rd / Marquess
50th St N
McDonald/Linden
40
13
20
13
Peak Hour
Left Turn Volumes
2010-20140
5
10
15
20
25
30
35
23
2 1 1
3
0 1 0 1 0
3 2
35 Total Crashes 2010-2014 Crashes on Stillwater Blvd (CSAH 15)
20
55th St N
53rd / Marquess
50th St N
McDonald/Linden
3
1
1
3
Number of Crashes (5 yr)
23
35
21
55th St N
53rd / Marquess
McDonald/Linden
Intersection Spacing
1200 ft
1750 ft
1850 ft
960 ft
1700 ft
2280 ft
1650 ft
Signal Considerations
•55th Street has the most left turns.
–But also has access to 58th Street signal.
•53rd/Marquess serves both sides.
–But has relatively few left turns.
•50th is a collector street, connects to
Lake Elmo Avenue.
–But it serves relatively few neighborhoods.
•McDonald/Linden serves both sides.
–But it has the fewest left turns.
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Signal Considerations
•No easy answer. However:
–55th Street has access to another signal.
–Marquess has access to 58th Street.
–53rd Street (Baytown) has another route to
40th Street (CSAH 14)
–McDonald/Linden has the fewest left turns.
•50th Street is a collector street.
–It does not have reasonable alternate routes.
–It will soon serve more neighborhoods.
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Additional Outcomes
If a traffic signal is installed at 50th:
–It will preclude a future signal at Marquess.
–County will expect the city to continue to
make neighborhood connections to 50th.
–The signal would be an interim strategy to
manage peak delays. It could be removed
with future 4-lane widening project.
–Signal would be more likely to remain in
place after 4-lane widening if 50th serves a
higher amount of sidestreet traffic.
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Cost Considerations
•50th Street Cost Share Example:
–Wood Pole Signal, $180,000.00
•County Share: $120,000
•City Share: $60,000
–Turn lanes are already in place
–Yearly power cost approximately $800.
–County maintains signal indications
–City maintains streetlights
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Questions
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•Does the city wish to pursue a signal
project based on this information?
•If yes, which year? (2017 or later)
•Priority vs. other needs in Lake Elmo?