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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 theRoundabout?
Public Meeting and Public Perceptions
Barrier Curb and Gutter Modifications
Challenges for Sequences of Construction
Time Constraints
General Public Comments andEnd 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 constructionsequence change.
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Circle or Roundabout ?
Circle
Area = r2Roundabout
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Why did DOTD elect to construct theRoundabout?
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 andPublic Perceptions
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Public Meeting and Public Perceptions
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Public MeetingPublic Perceptions
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Class M Concrete Mix Design
ModificationsRecommend not using Grade A (Size 57) coarse aggregate (100%
passing the 1 US Sieve)
Recommend changing mix design to max size Grade P (Size 67)
coarse aggregate (100% passing the US Sieve)
Barrier Curb and GutterModifications
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 GutterModifications
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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
Governors 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 alongUS 171 South BoundLane
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 andEnd 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
Si C i b t th Al d i
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Size Comparison between the AlexandriaSouth Traffic Circle and the LeesvilleRoundabout
Photo of the intersection of LA 8 and
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Photo of the intersection of LA 8 andUS 171, prior to construction
Proposed
Market Basket
location
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Completed Roundabout Aerial Photo of theintersection of LA 8 and US 171
Photo taken by SURDEX Corporation
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Q ti ?
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Questions ?
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