LAC 70:I.1325
LAC 70:I.1325. Minimum Design Guidelines for Urban Arterial Roads and Streets
Cite as La. Admin. Code tit. 70, pt. I, § 1325
Item No. | Item | Urban
Item No. | Item | UA-1 | UA-2 | UA-3 | UA-4 | UA-5
1 | Design Speed (mph) | 40 | 45 | 50 | 55 | 60
2 | Level of Service1 | C
3 | Number of Lanes | 2 (min)– 4 (typ) | 2 (min) – 4 (typ)
4 | Width of Travel Lanes(ft) | 11 | 11–12 | 12
5 | Width of Shoulders (minimum) (ft)2
5 | (a) Inside on multilane facilities | N/A | 4
5 | (b) Outside | 8
6 | Shoulder Type | Paved
7 | Parking Lane Width (ft) | 10–12 | N/A
8 | Width of Median on Multilane Facilities (ft)
8 | (a) Depressed | N/A | 30 | 34–42 | 42
8 | (b) Raised | 63–30 | 30
8 | (c) Two way left turn lane | 11–14 typ.4 | 11 – 14 typ.4 | N/A
9 | Width of Sidewalk (minimum) (where used) (ft)5
9 | (a) When offset from curb | 4
9 | (b) When adjacent to curb | 6 | N/A
10 | Fore slope (vertical – horizontal) | 1:3 (min) 1:4 (des) | 1:4 | 1:6
11 | Back slope (vertical–horizontal) | 1:3 | 1:4
12 | Pavement Cross-slope (%) | 2.5
13 | Minimum Stopping Sight Distance (ft) | 305 | 360 | 425 | 495 | 570
14 | Maximum Superelevation (%) | 4 | 6
15 | Minimum Radius (ft)6, 7
15 | (a) With normal crown (-2.5% cross-slope) | 700 | 1,000 | 16,700 | 19,700 | 22,880
15 | (b) With 2.5% superelevation | 550 | 750 | 3,500 | 5,250 | 6,280
15 | (c) With full superelevation | 500 | 700 | 1,000 | 1,100 | 1,400
16 | Maximum Grade (%) | 7 | 6 | 5
17 | Minimum Vertical Clearance (ft) 8 | 16
18 | Minimum Clear Zone (ft)
18 | (a) From edge of through travel lane | 189 | 24 9 | 2810 | 22 | 30
18 | (b) Outside from back of curb (when curb is used) | 6 (min)– 16 (des)11 | 6 (min)– 22 (des)11 | 1910 | 13 | 21
18 | (c) Median from back of curb12 (when curb is used) | 4 (min)– 12 (des) | 4 (min)– 18 (des) | 8 (min)– 17 (des) | 8 (min)– 25 (des)
19 | Bridge Design Live Load13 | AASHTO
20 | Width of Bridges (minimum) (face to face of bridge rail at gutter line)
20 | (a) Curbed facilities (without sidewalks) | Traveled14 way plus 8' | Roadway width
20 | (b) Shoulder facilities | Roadway Width | Roadway width
21 | Guardrail Required at Bridge Ends | 14 | Yes