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-1315 - Footnotes for Rural Collector Design Standards

La. Admin. Code tit. 70 § I-1315

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Current through Register Vol. 50, No. 9, September 20, 2024
Section I-1315 - Footnotes for Rural Collector Design Standards
A. Footnote for Item 1. Current traffic may be used to determine the appropriate classification.
B. Footnote for Item 2, RC-1 and RC-2 Classifications. The design speed may not be less than the current posted speed of the overall route.
C. Footnote for Item 3, RC-3 Classification. For rolling terrain, limited passing sight distance and high percentage of trucks, further analysis should be made to determine if additional lanes are required when ADT is above 7,000.
D. Footnote for Item 4, RC-2 Classification. For design speeds greater than 50 mph and ADT greater than 1,500 use 12-foot lanes.
E. Footnote for Item 5(b), RC-1 Classification. Where bicycle activity is observed, a 4-foot shoulder should be provided.
F. Footnote for Item 5(b), RC-2 Classification. For ADT greater than 1,500 use 6 foot shoulders.
G. Footnote for Item 6, RC-3 Classification. For ADT of 5,000 or greater, a minimum of 4 foot must be paved.
H. Footnote for Item 11, RC-1 Classification. 1:3 back slopes are allowed where right-of-way restrictions dictate.
I. Footnote for Item 14. In Districts 04 and 05, where ice is more frequent, superelevation should not exceed 8 percent from the emax = 10% table.
J. Footnote for Item 15. 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 15, RC-1 Classification. Radius based on 40 mph. Radii for 50 mph and 60 mph are shown under the RC-2 and RC-3 classifications respectively.
L. Footnote for Item 15, RC-2 Classification. Radius based on 50 mph. The radius for 60 mph is shown under the RC-3 classification.
M. Footnote for Item 17. Where the roadway dips to pass under a structure, a higher vertical clearance may be necessary. An additional 6 inches should be added for additional future surfacing.
N. Footnote for Item 18, RC-1 Classification. The lower value is based on a 40 mph design speed, the middle value for 50 mph and the upper value for 60 mph.
O. Footnote for Item 19. LRFD for bridge design.
P. 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-1315

Promulgated by the Department of Transportation and Development, Office of Highways/ Engineering, LR 30:809 (April 2004), repromulgated LR 30:2335 (October 2004), amended LR 35:2845 (December 2009).
AUTHORITY NOTE: Promulgated in accordance with R.S. 48:35(C).