LAC 70:I.1325 – Minimum Design Guidelines for Urban Arterial Roads and Streets

Item No.	Item	Urban
		UA-1	UA-2	UA-3	UA-4	UA-5
1	Design Speed (mph)	40	45	50	55	60
2	Level of Service¹	C	C	C	C	C
3	Number of Lanes	2 (min)– 4 (typ)	2 (min) – 4 (typ)	2 (min) – 4 (typ)	2 (min) – 4 (typ)	2 (min) – 4 (typ)
4	Width of Travel Lanes(ft)	11	11–12	12	12	12
5	Width of Shoulders (minimum) (ft)²
	(a) Inside on multilane facilities	N/A	N/A	4	4	4
	(b) Outside	8	8	8	8	8
6	Shoulder Type	Paved	Paved	Paved	Paved	Paved
7	Parking Lane Width (ft)	10–12	10–12	N/A	N/A	N/A
8	Width of Median on Multilane Facilities (ft)
	(a) Depressed	N/A	N/A	30	34–42	42
	(b) Raised	6³–30	6³–30	30	30	30
	(c) Two way left turn lane	11–14 typ.⁴	11 – 14 typ.⁴	N/A	N/A	N/A
9	Width of Sidewalk (minimum) (where used) (ft)⁵
	(a) When offset from curb	4	4	4	4	4
	(b) When adjacent to curb	6	6	N/A	N/A	N/A
10	Fore slope (vertical – horizontal)	1:3 (min) 1:4 (des)	1:3 (min) 1:4 (des)	1:4	1:6	1:6
11	Back slope (vertical–horizontal)	1:3	1:3	1:3	1:4	1:4
12	Pavement Cross-slope (%)	2.5	2.5	2.5	2.5	2.5
13	Minimum Stopping Sight Distance (ft)	305	360	425	495	570
14	Maximum Superelevation (%)	4	4	4	6	6
15	Minimum Radius (ft)^{6, 7}
	(a) With normal crown (-2.5% cross-slope)	700	1,000	16,700	19,700	22,880
	(b) With 2.5% superelevation	550	750	3,500	5,250	6,280
	(c) With full superelevation	500	700	1,000	1,100	1,400
16	Maximum Grade (%)	7	6	6	5	5
17	Minimum Vertical Clearance (ft)⁸	16	16	16	16	16
18	Minimum Clear Zone (ft)
	(a) From edge of through travel lane	18⁹	24⁹	28¹⁰	22	30
	(b) Outside from back of curb (when curb is used)	6 (min)– 16 (des)¹¹	6 (min)– 22 (des)¹¹	19¹⁰	13	21
	(c) Median from back of curb12 (when curb is used)	4 (min)– 12 (des)	4 (min)– 18 (des)	8 (min)– 17 (des)	8 (min)– 17 (des)	8 (min)– 25 (des)
19	Bridge Design Live Load¹³	AASHTO	AASHTO	AASHTO	AASHTO	AASHTO
20	Width of Bridges (minimum) (face to face of bridge rail at gutter line)
	(a) Curbed facilities (without sidewalks)	Traveled¹⁴ way plus 8'	Traveled¹⁴ way plus 8'	Roadway width	Roadway width	Roadway width
	(b) Shoulder facilities	Roadway Width	Roadway Width	Roadway width	Roadway width	Roadway width
21	Guardrail Required at Bridge Ends	14	14	Yes	Yes	Yes

Authority Note

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

Historical Note

HISTORICAL NOTE: Promulgated by the Department of Transportation and Development, Office of Highways/Engineering, LR 35:2848 (December 2009).