LADOTD Design Guidelines

LADOTD
Design Guidelines
03-01-2016
Why ?
“The Department of Transportation and Development shall
adopt minimum safety guidelines with respect to highway and
bridge design, construction, and maintenance. These safety
guidelines shall correlate with and, so far as possible, conform to
the system then current as approved by the American
Association of State Highway and Transportation Officials
allowing the flexibilities incorporated therein”
Louisiana Revised Statute 48:35
• The design guidelines are primarily concerned with the positioning of the
physical elements of a roadway.
• Basic objectives are to optimize efficiency and safety while minimizing
costs and environmental damage.
• Design consistency
DOTD has more than one Design Guideline
3R – Resurfacing/Restoration/Rehabilitation
PRR – Preservation /Rehabilitation/Replacement
Replacement or Major Rehabilitation on Non Interstate
Minor Rehabilitation
Preventative Maintenance
DOTD Minimum Design Guidelines
“New” Road
extensive changes in horizontal and vertical geometry (typically
involving right of way)
Replacement or Major Rehabilitation on Interstates
Reconstruction
Adding through Travel lanes
DOTD Minimum Design Guidelines
Urban Arterials
DOTD Minimum Design Guidelines
Arterial Footnotes
There Has Been 19 versions in 61 years
DOTD Previous Guideline Signed Dates
July 20-1955
Oct. 1955
July 1, 1969
March 10, 1971
June 22, 1972
April 29, 1977
June 2, 1977
July 3, 1980
October 19, 1982
June 1, 1983
April 3, 1984
April 28, 1975
December 16, 1987
November 16, 1988
Jan. 22, 1992
October 8, 1993
March 5, 2003
December 19, 2008
December 4, 2009
1955 Department of Highways
Design Standards
1955 Was Such a Simpler Time
1955
2009
Pages
1
15
Footnotes
3
99
Classifications
7
26
Items
17
18-21
A Committee was Formed
•
•
•
•
•
•
More Flexible
Power in Hands of Designers to choose what
is Appropriate
Want Designers to “think” instead of follow
“cook book”
Flexibility
Project Specific
Complete Streets
How we Accomplished Goals
•
•
•
•
Removed Sub classifications (UA-1, UA-2 etc)
Pick Individual Items
Tables vs Columns
Preferable and Acceptable
Preferred and Acceptable
Design project
Requires design
waiver from the DOTD
supervising engineer
Yes
Meets
acceptable
values?
No
No
Requires design
exception from the
Chief Engineer
Submit design
exception/design waiver
forms
Approved design
Meets
preferred
values?
None
No
Yes
exist
Meets
acceptable
values?
Rejected design
Yes
Requires no
exceptions
Design Speed
Lane Width
Shoulder Width
Bridge & Vertical Clearance
Lateral Offset & Clear Zone
Superelevation & Cross Slope
Grades
Slopes and Medians
Stopping Sight Distance
Complete Streets
End of The Show
Gary LeBlanc
Gary.N.LeBlanc@la.gov
225 - 379-1310
 Lydia