LAC 70:I.1313. Minimum Design Guidelins for Rural Collector Roads

Item No. | Item | Rural Item No. | Item | RC-1 | RC-2 | RC-3 1 | Average Daily Traffic 1 | Under 400 | 400-2000 | Over 2000 2 | Design Speed (mph) | 40–602 | 50–602 | 60 3 | Number of Lanes | 2 | 2–43 4 | Width of Travel Lanes (ft) | 11 | 11–124 | 12 5 | Width of Shoulders (ft) 5 | (a) Inside on multilane facilities | N/A | 4 5 | (b) Outside | 25 | 4–56 | 8 6 | Shoulder Type | Paved | Aggregate (2' min paved) | Aggregate (2' min paved)7 7 | Width of Parking Lanes (ft) | N/A 8 | Width of Median on multilane facilities (ft) 8 | (a) Depressed | N/A | 42-60 8 | (b) Raised | N/A 8 | (c) Two way left turn lane | N/A 9 | Width of Sidewalk (minimum) (ft) 9 | (a) Offset from curb | N/A 9 | (b) Adjacent to curb | N/A 10 | Fore Slope (vertical-horizontal) | 1:4 | 1:6 11 | Back Slope (vertical-horizontal) | 1:48 | 1:4 12 | Pavement Cross Slope (%) 8 | 2.5 13 | Stopping Sight Distance (ft) | 305 (40 mph) 425 (50 mph) 570 (60 mph) | 425 (50 mph) 570 (60 mph) | 570 14 | Maximum Superelevation (%)9 | 10 15 | Minimum Radius (ft) 10 (with full superelevation) | 45011 | 70012 | 1,100 16 | Maximum Grade (%) | 7 (40 mph) 6 (50 mph) 5 (60 mph) | 6 (50 mph) 5 (60 mph) | 5 17 | Minimum Vertical Clearance (ft)13 | 15 18 | Minimum Clear Zone (ft) (from edge of through travel lane) | 10, 14, 2414 | 26 (50 mph) 32 (60 mph) | 30 19 | Bridge Design Live Load15 | AASHTO 20 | Minimum Width of Bridges (face to face of bridge rail at gutter line) (ft) | 30 | Roadway width