alameda ave “after” study - denver · study. o west washington park alameda traffic study...
TRANSCRIPT
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Alameda Ave “After” StudyFindings and Recommendations
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• To analyze the impacts of the ‘no left turn’ at Corona has created along Alameda and on nearby streets.
• Develop interim and long term solutions to address the issues
Goal of the Study
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o West Washington Park Alameda Traffic Study Outcomes:March - April 2018 Higher than expected number of crashes at Corona St
associated with the westbound left turn and eastbound thru traffic Speed study: 34 mph on Alameda Ave
o Improvements Corona St: left turn restriction, northbound right turn, signal
warrant analysis (signal not warranted) Speed limit signs at Pennsylvania and Corona
Study Background
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INTERIM SOLUTIONS TO ADDRESS VISION ZERO NEEDS ON ALAMEDA AVENUEo Speeding issueso Crossing issues at Franklin / Alameda
IMPACTS TO ODGEN AND CLARKSONo How many vehicles are using Ogden /
Clarkson after the Corona LT prohibition?
o How fast is traffic traveling through Ogden / Clarkson?
“After” Study Questions
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~.75 miles
• Traffic Signals: Logan, Pearl, Washington, Emerson, Downing, and Marion
• Restricted Left Turns: Pearl, Corona, Downing, and Marion
• Alameda is classified as a Signalized Arterial
• The posted speed limit is 30 mph• 4 travel lanes – Logan to Franklin. 2
travel lanes east of Franklin• The corridor sees an average of
15,000 – 19,000 vehicles / day
Existing Conditions
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2 Travel Lanes
2 Travel Lanes
Posted Speed Limit = 30 mph
WB = 7,800 vpd; 34 mph EB = 10,500 vpd; 34 mph
WB = 8,500 vpd; 33 mph EB = 8,900 vpd; 34 mph
WB = 6,700 vpd; 33 mph EB = 9,000 vpd; 34 mph
WB = 6,100 vpd; 32 mphEB = 3,800 vpd; 31 mph
Alameda Avenue Volumes & Speed
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CLARKSON – South of Alameda• Average Daily Counts
Thurs – 546, Sat – 367 • 85th percentile Speed –
Thurs – 22mph, Sat – 21mph
CLARKSON – North of Alameda• Average Daily Counts
Thurs – 574, Sat – 540 • 85th percentile Speed –
Thurs – 24mph, Sat – 24mph
General Notes:• Counts taken Sept. 19th & 21st
• Thursday and Saturday• Posted Speed: 25 mph• Weather – Mild and Dry
Data Collection
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ODGEN – South of Alameda• Average Daily Counts
Thurs – 636, Sat – 457 • 85th percentile Speed –
Thurs – 22mph, Sat – 20mph
ODGEN – North of Alameda• Average Daily Counts
Thurs – 662, Sat – 531 • 85th percentile Speed –
Thurs – 24mph, Sat – 24mph
General Notes:• Counts taken Sept. 19th & 21st
• Thursday and Saturday• Posted Speed: 25 mph• Weather – Mild and Dry
Data Collection
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2 Travel Lanes
2 Travel Lanes
FRANKLIN • 5 correctable (angle crashes) crashes in
a 12-month period • Signal Warrant Study conducted on
02/2019- Did not meet traffic signal warrant- Did not meet crosswalk striping
warrant
General Notes:• Counts taken Feb 1-5, 2019• Friday-Tuesday• Posted Speed: 25 mph• Weather – Chilly and Dry
Data Collection
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2.52.2 2.0 2.2
4.0
1.5
0
1
2
3
4
5
Before After Before After Before After
Clarkson Ogden Corona
Annual Crash Rate*
Expected Crash Rate
Effect of the Left Turn Restriction
“Before” analysis period: 6/7/16 – 6/7/18“After” analysis period: 11/6/18 – 3/1/20 * Annual rate = # crashes / # years
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2 Travel Lanes
1 Travel Lane & 1 Center Turn Lane
• Removal of one westbound travel lane, with the exception of Downing and Marion intersections
Lane Repurposing between Franklin and Pearl
Moving Forward
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Alameda Ave
Coro
na S
t
• Flexible delineators and yellow striping • Re-enforces the right-in / right-out conditions• Vertical elements slows drivers down
Formalize the restricted conditions at Corona StMoving Forward
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2 Travel Lanes
1 Travel Lane & 1 Center Turn Lane
• 6 Potential locations: Washington, Emerson, Corona, Lafayette, Franklin (2)
• Vertical elements slows drivers• Pedestrians have a safe space for 2-step
crossing
Spot Interim MediansMoving Forward
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Fran
klin
St
Alameda Ave
• Better visibility of eastbound through cars
• Vertical elements slow down drivers
• Pedestrians have a safe space for 2-stage crossing
Spot Interim Medians
Moving Forward
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Design: Summer 2020 - Fall 2020
Implementation: Spring 2021 - Summer 2021
Schedule