LAC 70:I.1301. Minimum Design Guidelines for Rural Arterial Roads

Item No. | Item | Rural Item No. | Item | RA-1 | RA-2 | RA-3 1 | Design Speed (mph) | 501 | 602 | 70 2 | Number of Lanes (minimum)3 | 2 | 4 3 | Width of Travel Lanes (ft) | 11–124 | 12 4 | Width of Shoulders (minimum)(ft) 4 | (a) Two Lane | 85 | N/A 4 | (b) Divided facilities 4 | (1) Inside8 | 4 | 46 4 | (2) Outside | 85 | 8–107 5 | Shoulder Type | Aggregate (2' min paved) | Paved Aggregate8 (2' min paved) 6 | Parking Lane Width (ft) | N/A 7 | Width of Median on Divided Facilities (ft) 7 | (a) Depressed | 42–60 | 42-60 | 60 7 | (b) Raised | N/A 7 | (c) Two way left turn lane | N/A 8 | Fore slope (vertical–horizontal) | 1:6 9 | Back slope (vertical–horizontal) | 1:4 10 | Pavement Cross-slope (%) | 2.5 11 | Minimum Stopping Sight Distance (ft) | 425 | 570 | 730 12 | Maximum Superelevation (%)9 | 10 13 | Minimum Radius (ft)10 (with full superelevation) | 700 | 1,100 | 1,700 14 | Maximum Grade (%)11 | 4 | 3 15 | Minimum Vertical Clearance (ft)12 | 16 16 | Minimum Clear Zone(ft)(from edge of through travel lane) | 20 | 3013 | 34 17 | Bridge Design Live Load14 | AASHTO 18 | Width of Bridges (min) (face to face of bridge rail at gutter line) (ft) | Roadway width