La. Admin. Code tit. 70 § I-1301

Current through Register Vol. 50, No. 11, November 20, 2024

Section I-1301 - Minimum Design Guidelines for Rural Arterial Roads

Item No.	Item	Rural
		RA-1	RA-2	RA-3
1	Design Speed (mph)	501	602	70
2	Number of Lanes (minimum)3	2	2	4
3	Width of Travel Lanes (ft)	11-124	12	12
4	Width of Shoulders (minimum)(ft)
	(a) Two Lane	85	85	N/A
	(b) Divided facilities
	(1) Inside8	4	4	46
	(2) Outside	85	85	8-107
5	Shoulder Type	Aggregate (2' min paved)	Aggregate (2' min paved)	Paved Aggregate 8 (2' min paved)
6	Parking Lane Width (ft)	N/A	N/A	N/A
7	Width of Median on Divided Facilities (ft)
	(a) Depressed	42-60	42-60	60
	(b) Raised	N/A	N/A	N/A
	(c) Two way left turn lane	N/A	N/A	N/A
8	Fore slope (verticalhorizontal)	1:6	1:6	1:6
9	Back slope (verticalhorizontal)	1:4	1:4	1:4
10	Pavement Cross-slope (%)	2.5	2.5	2.5
11	Minimum Stopping Sight Distance (ft)	425	570	730
12	Maximum Superelevation (%)9	10	10	10
13	Minimum Radius (ft)10 (with full superelevation)	700	1,100	1,700
14	Maximum Grade (%)11	4	3	3
15	Minimum Vertical Clearance (ft)12	16	16	16
16	Minimum Clear Zone(ft)(from edge of through travel lane)	20	3013	34
17	Bridge Design Live Load14	AASHTO	AASHTO	AASHTO
18	Width of Bridges (min) (face to face of bridge rail at gutter line) (ft)	Roadway width	Roadway width	Roadway width

La. Admin. Code tit. 70, § I-1301

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 35:2840 (December 2009).

AUTHORITY NOTE: Promulgated in accordance with R.S. 48:35(C).