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Example #2: Designing A Spiral-Curve-Spiral Combination

Example #2: Designing A Spiral-Curve-Spiral Combination. Using MoDOT Standard Drawing 203.20 page 2/5 Select L s,ft from table: Emax =8% , 50mph, 24ft L s,ft = 122 ft. Determine the total length of the SCS combination based on the information provided below:

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Example #2: Designing A Spiral-Curve-Spiral Combination

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  1. Example #2: Designing A Spiral-Curve-Spiral Combination Using MoDOT Standard Drawing 203.20 page 2/5 Select Ls,ftfrom table: Emax=8% , 50mph, 24ft Ls,ft= 122 ft Determine the total length of the SCS combination based on the information provided below: ∆c = 37.5231⁰ R= 2000 ft Road is a rural principal arterial ADT = 1500 Posted speed = 50 mph Rolling terrain, 2-ft lane highway Using formula: Ls,ft=1.6 V3mph/Rft Calculate Ls,ft Ls,ft=1.6(50)3/2000 Ls,ft= 100 ft From AASHTO Values for Design Elements Related to Design Speed & Horizontal Curvature where emax=8% (Exhibit 3-23) Ls = 168 ft

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