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-1303 - Footnotes for Rural Arterial Design Standards

La. Admin. Code tit. 70 § I-1303

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Current through Register Vol. 50, No. 9, September 20, 2024
Section I-1303 - Footnotes for Rural Arterial Design Standards
A. Footnote for Item 1, RA-1 Classification. The design speed may not be less than the current posted speed of the overall route.
B. Footnote for Item 1, RA-2 Classification. Consider using RA-3 criteria (except Item No. 2) for roadways that will be widened in the future.
C. Footnote for Item 2. Consider increasing to a 4-lane facility if design volume is greater than 6,000 vehicles per day and six lanes if design volume is greater than 25,000 vehicles per day. If more than two lanes are to be provided, outside shoulders should be paved.
D. Footnote for Item 3, RA-1 Classification. Twelve feet required when design ADT is 1,500 or greater.
E. Footnote for Items 4(a) and 4(b)(2), RA-1 and RA-2 Classifications. Six foot shoulders are allowed if design volume is between 400 to 2,000 vehicles per day. Four foot shoulders are allowed if design volume is less than 400 vehicles per day.
F. Footnote for Item 4(b)(1), RA-3 Classification. Eight to ten feet to be provided on six lane facilities.
G. Footnote for Item 4(b)(2), RA-3 Classification. Consider using 10 foot outside shoulders where trucks are greater than 10 percent or if large agricultural vehicles use the roadway.
H. Footnote for Item 4(b)(1) and for Item 5, RA-3 Classification. For ADT 5,000 or greater, the full shoulder width shall be paved.
I. Footnote for Item 12. In Districts 04 and 05, where ice is more frequent, superelevation should not exceed 8 percent from the emax = 10 percent table.
J. Footnote for Item 13. 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.
K. Footnote for Item 14. Grades 1 percent higher are permissible in rolling terrain.
L. Footnote for Item 15. An additional 6 inches should be added for additional future surfacing.
M. Footnote for Item 16, RA-2 Classification. On multilane facilities, use 32 feet.
N. Footnote for Item 17. LRFD for bridge design.
O. 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-1303

Promulgated by the Department of Transportation and Development, Office of Highways/Engineering, LR 30:806 (April 2004), repromulgated LR 30:2332 (October 2004), amended LR 35:2841 (December 2009).
AUTHORITY NOTE: Promulgated in accordance with R. S. 48:35(C).