LAC 70:I.1321. Minimum Design Guidelines for Urban and Suburban Collector Roads and Streets

Item No. | Item | Urban | Suburban1 Item No. | Item | UC-1 | UC-2 | SC-1 | SC-2 | SC-3 1 | Average Daily Traffic | N/A 2 | Design Speed (mph) | 30–40 | 45 | 40 | 45 | 50 3 | Number of Lanes (minimum) | 2–4 4 | Width of Travel Lanes (ft) | 11–12 | 122 | 11 | 11–122 5 | Width of Shoulders (ft) 5 | (a) Inside on multilane facilities | N/A | 43 5 | (b) Outside | 82, 4 | 82,4 | 4–54 | 6, 85 6 | Shoulder Type | Paved 7 | Width of Parking Lanes (where used) (ft) | 7–106 | 11 | 7–106 | 11 | N/A 8 | Width of Median on multilane facilities (ft) 8 | (a) Depressed | N/A | 30 8 | (b) Raised | 4 (min)–30 (des) | 4 (min) –30 (des) | 4 (min)–30 (des) | 26 8 | (c) Two way left turn lane | 11–14 typ.7 | N/A 9 | Width of Sidewalk (minimum) (where used) (ft) 8 9 | (a) When offset from curb | 4 9 | (b) When adjacent to curb | 6 | N/A 10 | Fore Slope (vertical – horizontal) | 1:3–1:49 | 1:4 11 | Back Slope (vertical – horizontal) | 1:310 | 1:3 12 | Pavement Cross Slope (%) | 2.5 13 | Minimum Stopping Sight Distance (ft) | 200 (30mph) 305 (40mph) | 360 | 305 | 360 | 425 14 | Maximum Superelevation (%) | 4 | 6 15 | Minimum Radius (ft)11, 12 15 | (a) With normal crown (-2.5% cross slope) | 325(30mph) 700(40mph) | 1,000 | 700 | 1,000 | 16,700 15 | (b) With 2.5% superelevation | 250(30mph) 550(40mph) | 750 | 550 | 750 | 4,400 15 | (c) With full superelevation | 235(30mph) 500(40mph) | 700 | 500 | 700 | 900 16 | Maximum Grade (%) | 9 | 8 | 7 | 6 17 | Minimum Vertical Clearance (ft)13 | 15 18 | Minimum Clear Zone(ft) 18 | (a) From edge of through travel lane | 10 | 26 – 2814 18 | (b) Outside from back of curb (when curb is used) | 1 (min)―6 (des) | 6 (min)―8 (des) | 1 (min)―6 (des) | 6 (min)―8 (des) | 17 – 1915 18 | (c) Median from back of curb (when curb is used) | 1 (min)―6 (des) | 1 (min)―8 des) | 1 (min) – 6 (des) | 1 (min)―8(des) | 13 19 | Bridge Design Live Load16 | AASHTO 20 | Minimum Width of Bridges (face to face of bridge rail at gutter line) 20 | (a) Curbed facilities (without sidewalks) | Traveled17 way plus 8' | Roadway width (b) Shoulder facilities | Roadway width 21 | Guardrail Required at Bridge Ends | 17 | Yes