us 171 at la 8 roundabout - before and after safety and operations
TRANSCRIPT
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Roundabout Construction
SP 373-01-0020
LA 8 / US 171 Roundabout
Leesville, LA
Vernon Parish
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What this presentation covers
Recognition for District 08 Design and Traffic Sections
Difference between a circle and a roundabout
Why did DOTD elect to construct the Roundabout?
Public Meeting and Public Perceptions
Barrier Curb and Gutter Modifications
Challenges for Sequences of Construction
Time Constraints
General Public Comments and End Results
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Recognition for District 08 – Design and Traffic Sections
Dale Craig – District 08 Traffic Section
• Recommended roundabout design and spearheaded
the project to the design phase
Jason Rachal – District 08 Design Section
• The overall success for this project is greatly
attributed to the project plans developed by Jason
Rachal
David Backstedt - District 08 Traffic Engineer
• David meet with me on the project site on numerous occasions
in order to monitor the traffic flow after each construction
sequence change.
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Circle or Roundabout ?
Circle
Area = π × r2 Roundabout
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Why did DOTD elect to construct the Roundabout?
• Permit request for
access to a proposed
Market Basket grocery
store
• Traffic Study and
Evaluation
• Buy-in from DOTD,
Market Basket and City
of Leesville
Proposed
Market
Basket
location
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Public Meeting and Public Perceptions
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Public Meeting and Public Perceptions
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Public Meeting Public Perceptions
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• Class M Concrete Mix Design
Modifications Recommend not using Grade A (Size 57) coarse aggregate (100%
passing the 1 ½” US Sieve)
Recommend changing mix design to max size Grade P (Size 67)
coarse aggregate (100% passing the ¾” US Sieve)
Barrier Curb and Gutter Modifications
• Installed continuous
steel reinforcement in
the barrier curb section
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• Installed Bolster Blocks behind sharp angled corners of
curb section
Barrier Curb and Gutter Modifications
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Time Constraints
• Project Letting Date: July 21, 2010
• Work Order Date: September 24, 2010
• Roundabout Opening Date: August 1, 2011
• Market Basket Grand Opening Date: August 4, 2011
• Governor’s Ribbon Cutting Date: August 5, 2011
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
Temporary Traffic Signals
installed at intersection of LA
8 and US 171
Traffic congestion along US 171 South Bound Lane
Temporary Traffic
Signals
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
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Sequence of Construction - Phase I
Temporary Traffic Signals installed at
intersection of LA 8 and US 171
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Sequence of Construction - Phase II
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Sequence of Construction - Phase II
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Sequence of Construction - Phase II
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Sequence of Construction - Phase II
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Sequence of Construction - Phase III
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Sequence of Construction - Phase III
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Sequence of Construction - Phase III
• Removed temporary traffic signals
• Staged flagmen at each access point into the
roundabout
• Utilized dynamic message signs cautioning
traveling public that roundabout is open and there
is a yield condition ahead
• Installed do not enter signs on temporary stands at
each connection point to the roundabout
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Sequence of Construction - Phase III
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General Public Comments and End Results
• All of the Politicians and most of the general public
have very favorable comments in regards to the
functionality of the Roundabout
• From 2007 to 2010 there was an average of 10
injuries per year with only 1 fatality during that time
period.
• Since 2010 there has only been one injury, which
occurred in January 2013.
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End Results
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Size Comparison between the Alexandria South Traffic Circle and the Leesville Roundabout
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Photo of the intersection of LA 8 and US 171, prior to construction
Proposed
Market Basket
location
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Completed Roundabout Aerial Photo of the intersection of LA 8 and US 171
Photo taken by SURDEX Corporation
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Questions ?