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-1327 - Footnotes for Urban Arterial Design Guidelines

La. Admin. Code tit. 70 § I-1327

Download
PDF
Current through Register Vol. 50, No. 11, November 20, 2024
Section I-1327 - Footnotes for Urban Arterial Design Guidelines
A. Footnote for Item 2. Level of service D allowable in heavily developed urban areas.
B. Footnote for Item 5. Curb may be used in place of shoulders on UA-1 and UA-2 facilities. If used on UA-3, UA-4 or UA-5 facilities, curb should be placed at the edge of shoulder. For design speeds greater than 45 mph, curb will not be placed in front of guardrail.
C. Footnote for Item 8(b), UA-1 and UA-2 Classifications. With Chief Engineer's approval, curb offsets may be eliminated and the minimum median width can be reduced to 4 feet. On principal arterials, particularly at intersections, the upper limit should be considered.
D. Footnote for Item 8(c), UA-1 and UA-2 Classifications. Cannot be used on multilane roadways (with four or more through lanes) without the Chief Engineer's approval.
E. Footnote for Item 9. Sidewalks must be separated from the shoulder and should be placed as near the right of way line as possible. On high speed facilities, they should preferably be placed outside the minimum clear zone shown in Item 18.
F. 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.
G. Footnote for Item 15. The following radii apply at divisional islands. The radius selected must match the design speed of the road. These radii also apply to the other guidelines where divisional islands are mentioned.

Design Speed

Radius (Rounded)

Degree of Curve

20

1,450'

4°

25

1,650'

3° 30'

30

1,950'

3°

35

2,300'

2° 30'

40

2,900'

2°

45

3,850'

1° 30'

50

5,750'

1°

55 and 60

11,500'

0° 30'

H. Footnote for Item 17. An additional 6 inches should be added for additional future surfacing.
I. Footnote for Item 18(a), UA-1 and UA-2 Classifications. Applies to facilities with shoulders. Refer to the Roadside Design Guide when 1:3 fore slopes are used or for slopes flatter than 1:4.
J. Footnote for Items 18(a) and 18(b), UA-3 Classification. The distance may be reduced by 6 feet if 1:6 slopes are used. For outside shoulders wider than 8 feet, further reduction should be proportional to the added shoulder width.
K. Footnote for Item 18(b), UA-1 and UA-2 Classifications. If outside shoulders and curb are used, refer to the Roadside Design Guide.
L. Footnote for Item 18(c). Where left turn lanes are provided or where the median is less than 6 feet in width, the minimum clearance will be 1.5 feet from back of curb. For median slopes steeper than 1:6, refer to the Roadside Design Guide for the desirable clear zone.
M. Footnote for Item 19. LRFD for bridge design.
N. Footnote for Items 20(a) and 21, UA-1 and UA-2 Classifications. Refer to EDSM II.3.1.4 when sidewalks will be provided and for guardrail requirements.
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-1327

Promulgated by the Department of Transportation and Development, Office of Highways/Engineering LR 35:2849 (December 2009).
AUTHORITY NOTE: Promulgated in accordance with R.S. 48:35(C).