Louisiana Administrative Code › Title 70 - TRANSPORTATION AND DEVELOPMENT › Part 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

Current through Register Vol. 50, No. 6, June 20, 2024
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.
AUTHORITY NOTE:
				  Promulgated in accordance with
				  R.S.
				  48:35(C).