penny lala johnathan perry clara foshee cristine gowland · penny lala. us 190 background...
TRANSCRIPT
www.dotd.la.gov
Penny Lala
Clara Foshee
Covington’s US 190 SuperstreetStatewide Traffic Engineer’s Meeting 2019
UPERSTREET
Johnathan Perry
Cristine Gowland
www.dotd.la.gov
Introduction
Penny Lala
US 190 Background Information
Covington, St. Tammany Parish
62,726 ADT in 2017
45mph, six-lane, divided urban arterial from I-12 to US 190
Business– Median width ~ 65’
Congested corridor
Large cycle lengths
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US 190 Background Information
Corridor can be divided into two
sections:– I-12 to the Abita River Bridge
• ~ 2 miles
• 7 traditional signals
• 6 U-turns with yield control
• Dense driveway spacing
• Heavy development
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US 190 Background Information
Corridor can be divided into two
sections:– Abita River Bridge to US 190 Business
• ~ 1 mile
• 3 full-access, two-way stop controlled
intersections (80’ – 90’ wide)
• 3 U-turns with yield control
• Bordered by signalized corridor to
the north
• Driveways more spaced out
• Less development
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Previous Capacity Improvements
013-11-0026– Let in January 2004
– Project Limits: I-12 to the Abita River
Bridge
– Widen US 190 from 4-lanes to 6-lanes
– All existing full-access signals
remained
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Previous Capacity Improvements
H.000490– Let in July 2005
– Project Limits: the Abita River Bridge
to US 190 Business
– Widen US 190 from 4-lanes to 6-lanes
– All existing intersection control
remained the same
– Project constructed a 6-lane road to a
2-lane bridge
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US 190 Existing Issues
Queuing of northbound and southbound thru traffic
Some left turns over-capacity
6-lane highway to 2-lane bridge
Poor lane utilization
Cannot widen US 190 without impacting many businesses
Traffic predominantly enters or exits US 190 at the
intersections (not a lot of cross traffic)
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US 190 Superstreet Traffic Study
Headquarters asked for routes to be studied as a Superstreet
We were aware of development coming that was going to further
break the broken roadway
We proposed US 190 Covington
Study was initiated in 2010
Study made recommendations involving both sections of US 190
Wal-Mart Marketplace development was initiated during the
study, so the study incorporated the permit requirements
Study completed in 2012 by Neel-Schaffer
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US 190 Superstreet Scope Issues
Had to define limits on where the project would stop– Should have considered the signalized corridor immediately
outside the limits
Study assumed the entire corridor would be done at once– Not feasible during construction
– How do you phase in the improvements?
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US 190 Superstreet Public Meeting
Meeting held June 18th, 2014– DOTD Employees, State Officials and Public in attendance
Received feedback and redesigned for an upcoming
development– Worked with consultant to get trip numbers and include them
in analysis
– Additional intersection at Greengate added
• Dual lefts onto the proposed connection
• Developer had to widen connection to accept the dual lefts
– U-turn locations modified to accommodate
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www.dotd.la.gov
Plan Development
Clara W. Foshee
Developing The PlanWhat should be done first?
– Should the new signals be installed and activated first, or should all of the
construction work be done first?
– When should the new U-Turns be built and signalized? When should the old
ones be closed?
How will all of these signals be turned on?– 15 intersections where configuration and phasing/timings will change
– 2 signalized intersections where only the equipment will change
– How will all 17 signals, spanning across 3 miles of congested highway, be
activated?
How do we maintain access and flow during construction?– Lane closure restrictions? How tight do we make the restrictions?
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US 190 at Frontage Rd
EXISTING
What Should Be Done First?
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SUPERSTREET15
2
12
18
5
26
4
7
How Do We Turn All These Signals On?
Corridor broken into four groups for feasibility– Based on relationship of intersections to each other
• Wanted to keep U-Turns grouped with their respective origin movement
– Group size varied depending on density of signals and locations
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(7 signals – 1.07 miles)
(4 signals – 0.66 miles)(3 signals – 0.66 miles)
(3 signals – 0.24 miles)
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7 signals – 1.07 miles long
Holiday Blvd
2 Restricted-Access Intersections
3 U-Turn Only Intersections
2 Restricted-Access & U-Turn Intersections
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4 signals – 0.66 miles long
2 Restricted-Access Intersections
2 U-Turn Only Intersections
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3 signals – 0.66 miles long
2 U-Turn Only Intersections
1 Restricted-Access Intersection
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3 signals – 0.24 miles long
3 U-Turn Only Intersections
1 Unsignalized U-Turn Only Intersection
1 Signalized Restricted-Access Intersection
1 Signalized U-Turn Only Intersection
Wanted to start at North end of project and work our way South – Northern intersections provided more leeway with unexpected issues
– Starting at the North end would make it easier to adjust offsets further
down the corridor
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Desired Activation Order
(7 signals – 1.07 miles)
(4 signals – 0.66 miles)
(3 signals – 0.66 miles)(3 signals – 0.24 miles)
How Do We Maintain Access & Flow?
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Lane Closure Restrictions– Need to be very strict
– Need to be in effect at all times
One Exception – US 190 at Park Place Dr– Turn-lane closed for multiple weeks on EB approach
– Cross-connectivity available
– Best solution to undesirable situation
Adjustments During Plan Development
Holiday Blvd Geometrics– Proposed dual right-turns off side-street
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Corridor Timings – Study Recommended Timings:
• AM: 100 second cycles
• PM: 100 second cycles
– Timings in Field:• AM: 190 second cycles
• PM: 180 second cycles
– New Timings: • AM: 95 second cycles
• PM: 90 second cycles
AB
The Final Plan
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www.dotd.la.gov
Implementation Issues
Johnathan Perry, P.E.
Issues Discovered During Preconstruction
What order would the contractor activate signals?
When would detection be installed?
There was confusion when ordering the total quantities for
the project– TSIs were provided for two existing intersections that were not fully
accounted for in the Final Plans
– Only the new signal equipment quantities were added to plans for
these intersections (controllers, pods, fiber, etc.)
Travel time studies needed before construction started
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Direction Range (min.) Avg. (min.)
Period Pre-Construction (4/2018)
AMNB 7-15 10.9
SB 5-15 10.8
PMNB 12-32 17.8
SB 7-19 14.4
During Construction (3/2019)
AMNB - -
SB - -
PMNB 10.5-13.5 12.1
SB 10-13 11.5
Travel Time Studies
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v
v
v
Issues Discovered During Construction
Adjacent Signalized Corridors
Signal Issues– Timings
– Controllers
– Cabinet Access
– Equipment Placement
– Signal Head Visibility
Sequence of Construction Issues
Signage Issues
Striping Issues
Other Issues
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Adjacent Corridor Issues
Existing signalized corridors
adjacent to project– Signal system north of the bridge
(3 full-access)
– Signal system coordinated with
superstreet (4 full-access and 2
restricted-access)
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Signal Issues - Timings
District was responsible for adjustment of signals – Green time adjustments
– Offset coordination (build as we go instead of backtracking later)
District had to time the existing corridor to the north to
match Superstreet timings before activation
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Signal Issues - Controllers
Controller clocks drifting, AKA “Dirty Power”
Signals did not force off at the correct time – what can we do?– Re-time the entire corridor?
– Adjust the NTCIP Yield Value in all controllers?• Trial-and-Error method to get the internal Easy-Calcs to match the Force-Offs
on the TSIs
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Signal Issues – Cabinet Access
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Signal Issue – Equipment Placement
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Signal Issues – Head Visibility
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Sequence of Construction Issues
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Signal work performed before earth work– Lead to damaged equipment
Signage Issues - Lack of Adequate Signage
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Signage Issues – Conflicting Information
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Striping Issues – Stop Bar Placement
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Striping Issues - Lane Utilization
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Non-Uniform Pavement– 3 different pavements on
one approach
Misleading Traffic Control
Devices– Cones give impression
that inside lane is closed
Lack of Striping– No temporary striping to
guide motorists
Striping Issues - Lane Utilization
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Other Issues - Environmental Impacts
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Permitted Movements– Rights-In/Thrus
– Lefts-In/Rights-Out
Illegal Movements– NB & SB U-Turns from
Left-Turn Lanes
Observations at one
intersection:– 2 Hour PM Period
– 52 NB Illegal U-Turns
– 14 SB Illegal U-Turns
Other Issues – Illegal Movements
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Other Issues – Illegal Movements
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Local News Review
www.dotd.la.gov
Lessons Learned
Cristine Gowland, P.E.
Next Steps and Conclusions
Signal Coordination
Ongoing Public Outreach
Public Opinion
Measures of Success
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Signal Coordination
Coordination of both
northbound and southbound
traffic simultaneously
Not as efficient as two, one-way
facilities
Controlling full access signal on
north side
Independent coordination of
northbound and southbound
traffic
Too many cabinets to split (17
now versus 29 individual)
Need to try independent rings in
same controller
Pattern Offsets menu allows for
different offsets to be assigned
to each ring
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Current: Future (Eventually):
Ongoing Public Outreach
MyDOTD notifications issued
Public Meeting was removed from Webpage and had to be re-added
Public Information Group created a graphic of the corridor and
posted it
Numerous phone call and email questions and complaints
Troop L wanted to meet with local businesses on corridor for a
“Safety Meeting”
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Local Business Outreach - Troop L
DOTD contacted State Police Troop L concerning enforcement of
illegal U-turns
Troop wanted to perform outreach to local businesses before heavy
enforcement
Troop proposed a joint effort with DOTD
– The Troop would talk about safety
– DOTD would speak about Superstreet
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Local Business Outreach - Troop L
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The presentation has been given to two separate groups at Cantium
and one large group at Chevron
Most people in the room where there because they wanted to be. . .
Reached 300 corridor drivers so far
Old Five-Phased Signal Timing
180-Second (3-Minute)
Signal Cycles
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New Two-Phased Signal Timing
90-Second (1.5-Minute)
Signal Cycles
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Why Are U-Turns Not Allowed Here?
CRASH
CRASH
Potential crashes with right
turners
Delays for right turners because
side street has to brake to avoid
crashes
Delays for left turns because
they have to slow down to make
the U-turn movement
U-turns have separate,
designated areas
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Public Opinion - Facebook
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Public Opinion - Resolution
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Measures of Success
Follow-up travel time studies planned
Before/after crash analysis planned (longterm)
Implementation of adjacent projects
–I-12 widening to south
–US 190 widening of Bogue Falaya Bridge to north
Public Opinion (decline of negative feedback)
One more presentation to discuss results ~ 2024?
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www.dotd.la.gov
Questions?