stephen e. meyer, msc, p.e. superstreet arterial management … · 2015. 2. 20. · tsite spring...
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
red
TSITE Spring Meeting
SSAM©
Superstreet Arterial Management SystemFor Congested Corridors
Presented By:Stephen E. Meyer, MSc, P.E.President,Meyer Transportation
Consultants, Inc.
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Today’s Agenda
• SSAM © - What is it?
• How can SSAM © be applied?
• Pros and cons of SSAM ©
• Is SSAM © good for your client/city
• SSAM © concept in Huntsville, Alabama
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
SSAM © - What is it?
Conventional 4-legged Intersection Superstreet Intersection
• Primarily used on multilane median divided arterials
• Features limited access control
• Minimizes arterial median openings
• Reduces intersection conflict points by using indirect turns
• Reduces the number of phases required at intersections
• Increases available phase time for the major arterial
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
SSAM © - What is it?
• Primary used on multilane median divided arterials
• Features limited access control
• Minimizes arterial median openings
• Reduces intersection conflict points by using indirect turns
• Reduces the number of phases required at intersections
• Increases available phase time for the major arterial
Conventional 4-legged Intersection Superstreet Intersection
The Results• Improved safety
• Reduced delay and congestion
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Super street Typical Inter section
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Super s treet vs 4 - legged Inter section
How many conflict points?
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
32 Conflict Points
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
SSAM © - What is it?
Intersection geometry AND WHAT?
Restricted Crossing U-Turn (RCUT)
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
SSAM © - What is it?
Intersection geometry AND WHAT?
Michigan U-Turn
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
SSAM © - What is it?
Intersection geometry AND WHAT?
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
SSAM © - What is it?
AND Signal Phasing and Timing Principles
• Reduce or eliminate cross street phases using indirect turns results in more green time for the arterial
• Use lead/lag phasing at traffic signals to increase available green to improve throughput
• Use of half-cycle offset pattern to increase flows in both directions of travel on the arterial
• Shift offset pattern zero points to minimize stops and increase the use of the green at each intersection for arterial throughput
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
How can SSAM © be Applied?
Restrict crossing the median barrier at as many intersections where politically feasible
WHY?
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
How can SSAM © be Applied?
TO GET ONE WAY PROGRESSION!
Imagine 6 controllers
• One-way timing EBD and one-way timing WBD
1 2 3
4 5 6
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
How can SSAM © be Applied?
Where you have to cross the median at the intersection
Increase arterial green time by eliminating cross street phases by using indirect left turns
• Notice the 125% increase in green for the arterial
• Evaluate increased size and green bands
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
How can SSAM © be Applied?
Use lead/lag phasing at traffic signals to optimize the arterial throughput
Effectiveness of Lead–Lag Phasing on Progression Bandwidth
Zong Tian, Varun Mangal and Hongchao Liu
http://www.depts.ttu.edu/transtech/paper/23.pdf
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
How can SSAM © be Applied?
Use of half-cycle offset pattern in increase flows in both directions of travel on the arterial
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
How can SSAM © be Applied?
Shift offset pattern zero points to minimize stops and increase the amount of time of green bands
• Start with 120-second cycle
• Identify the intersections that have major arterial cross streets that require 8 phases-reduce phases where possible
• Can you give the arterial a minimum of 50% of the cycle?
• Look at the block spacing to see if you can produce offsets for signals at the zero and half cycle point
• If you are not satisfied with the bi-directional green bands, go to the next step and introduce Superstreet Geometrics and Lead-Leg optimization
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
How can SSAM © be Applied?
South Parkway, Huntsville, Alabama- AM Bands5 Signals, 120 sec Cycle, 63 sec. Inbound and 32 Sec. Outbound
Green Bands with no stops
No Stops
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Pros of SSAM ©
• Capacity equal of expressway at less than 10% of total reconstruction cost (on a 4 lane divided arterial with 50% of
cycle was able to service 1100vph/lane on 120 second cycle=>4400 vph/approach in simulation)
• Quality of arterial flow can be equal to that of a one-way street pair
• Unsurpassed platoon management along arterial
• Favorable constructability compared to expressway with service road
• Time savings: 2-3 years minimum compared to expressway with service roads
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Pros of SSAM ©
• ROW requirements considerably less than expressway of equivalent capacity
• Access management principles are included in design
• Multimodal needs are addressed
• Provides safe and convenient crossings for pedestrian, bicyclists and transit users
• Creates less delay and obstruction to arterial traffic during reconstruction that of an expressway with service roads
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Pros of SSAM ©
• Maintains existing level of access to roadside business properties during construction
• Has negligible negative impact to existing (and future) roadside development
• Incident management issues can be addressed with ITS deployables
• Minimizes need for police enforcement presence.
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Cons of SSAM ©
• Can be difficult to convince local and state government officials
• Can be even more difficult to convince local business owners
• Convincing realtors can be difficult of existing commercial areas and future commercial areas
• Many will doubt that the SSAM © will work
• Motoring public must be educated on how Superstreet works
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Is SSAM © Good for your Cl ient/City?
• Does the congested arterial have a median with a minimum of 40 feet?
• Is the congestion so bad that the community and business people are clamoring for a solution?
• Is the crash rate on the arterial higher than the state critical crash rate?• This may allow for some additional funding
• Do your elected officials want to slow the speed of the vehicles on the arterial?• The signal timing can be set to have more consistent speeds
• Is the freeway solution going to cost more than is available?• Superstreet is less expensive and is constructed fast
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
SSAM © Concept in Huntsvil le, AL
University DriveFrom Providence Main Road to County Line Road
• 5.5 miles
• 13 signals
• Retail and residential
• Commuter route
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
• Four lane median divided roadway
• Posted speed limit 45-55 mph
• Daily volume 30k-50k
• Peak hour congestion
• Roadway is approaching capacity
SSAM © Concept in Huntsvil le, AL
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
• 11+ lane miles added-all six lane divided
• 34 medians modified
• 10 U-turn locations
• 6 locations where turning capacity is increased
SSAM © Concept in Huntsvil le, AL
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
SSAM © Concept in Huntsvil le, AL
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Signal T iming for Univer sity Drive
• 30,000 – 55,000 ATD
• 13 intersections
• 6-lane cross section with grass median
AM120 Second Cycle – No Stops
Inbound Greenband: 52 seconds
Outbound Greenband: 36 seconds
PM120 Second Cycle – No Stops
Inbound Greenband: 44 seconds
Outbound Greenband: 52 seconds
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
AM TSD for University Drive
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
PM TSD for University Drive
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
Pedestrian Crossing
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Meyer
Transportation
Consultants, Inc.TSITE Spring Meeting 2015
T H A N K Y O U
Surely you have questions!