Statutes, codes, and regulations
Louisiana Administrative Code
Title 70 - TRANSPORTATION AND DEVELOPMENTPart I - Highway Construction
Chapter 13 - Design Guidelines for Freeways, Arterial, Collector, and Local Highways under the Jurisdiction of Political Subdivisions and Not in the State-Maintained System
Section I-1311 - Footnotes for Local Road and Street Design Guidelines

La. Admin. Code tit. 70 § I-1311

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Current through Register Vol. 50, No. 11, November 20, 2024
Section I-1311 - Footnotes for Local Road and Street Design Guidelines
A. Footnote for Item 1. The design speed may not be less than the current posted speed of the overall route.
B. Footnote for Item 4, RL-3 Classification. For ADT greater than 2,000, use 12-foot lane widths.
C. Footnote for Item 4, UL-1 and UL-2 Classifications. Lane widths in residential areas may be reduced to 9 feet if necessary. Twelve foot lane widths are preferred in industrial areas.
D. Footnote for Item 5. Where bicycle activity is prevalent, a paved 4-foot shoulder should be provided.
E. Footnote for Item 5, RL-3 Classification. For ADT less than 1,500, the minimum shoulder width may be reduced to 4 feet if necessary. For ADT 1,500 to 2,000, use 6-foot shoulders. For ADT over 2,000, use 8-foot shoulders.
F. Footnote for Item 5, UL-1 and UL-2 Classifications. Select the shoulder width that corresponds to the ADT shown in the rural local road guidelines.
G. F ootnote for Items 9 and 17(a), RL-1 and RL-2 Classifications. The value shown should be provided on new roadways. A lesser value may be used on existing roads depending on soil stability, right-of-way constraints, the safety record of the road, and the size vehicles using the road. Guidance is available in the publication entitled "AASHTO Standards for Geometric Design of Very Low Volume Local Roads (ADT < 400)".
H. Footnote for Item 13, RL-1, RL-2 and RL-3 Classifications. In Districts 04 and 05, where ice is more frequent, superelevation should not exceed 8 percent from the emax = 10% table.
I. Footnote for Item 14. It may be necessary to increase the radius of the curve and/or increase the shoulder width (maximum of 12 feet) to provide adequate stopping sight distance on structure.
J. Footnote for Item 14. On roadways with an ADT < 400, a sharper radius may be used on fully superelevated roadways if necessary. For specific values refer to the publication entitled AASHTO guidelines for Geometric Design of Very Low Volume Local Roads (ADT < 400)'. Different radii apply at divisional islands.
K. Footnote for Item 15. Grades 2 percent higher may be used in rural rolling terrain.
L. Footnote for Item 17(a), RL-3 Classification. Varies from 14 feet to 28 feet. Refer to the Roadside Design Guide for the applicable value. For spot replacement projects refer to the applicable part of footnote G for Items 9 and 17(a).
M. Footnote for Item 18. LRFD for bridge design.
N. Footnote for Item 19, RL-3 Classification. For ADT greater than 2,000, use roadway width.
O. Footnote for Item 19, UL-1 and UL-2 Classifications. Refer to EDSM II.3.1.4 when sidewalks will be provided and for guardrail requirements.
P. Footnote for Items 19 and 20, UL-1 and UL-2 Classifications. When shoulders are provided, the minimum bridge width shall be the larger of that shown or the roadway width.
Q. General Note. These guidelines shall not apply to:
1. dead end roads (open at one end only);
2. roads that are dependent on dead end roads for access.
R. Urban guidelines may be applied to any street for which curb is to be used and the posted speed is less than 50 mph, or any street for which a posted speed of 30 mph or less would be appropriate.
S. General Note. On spot replacement projects the existing geometry and superelevation may remain providing there are no safety problems.
T. General Note. The appropriate local governing body is authorized to make design exceptions for specific items listed in these guidelines, with proper engineering justification.
U. General Note. DOTD pavement preservation minimum design guidelines or 3R minimum design guidelines (separate sheets) shall be applicable to those projects for which the primary purpose is to improve the riding surface.

La. Admin. Code tit. 70, § I-1311

Promulgated by the Department of Transportation and Development, Office of Highways/Engineering, LR 30:808 (April 2004), repromulgated LR 30:2334 (October 2004), amended LR 35:2843 (December 2009).
AUTHORITY NOTE: Promulgated in accordance with R.S. 48:35(C).