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42 <br /> MODEL FACTORS FOR TRAFFIC IMPACT ANALYSIS <br /> FACTOR STANDARD SOURCE <br /> 23. LOS ADT Matrix Trip Level of Service <br /> Generation Lanes/Terrain <br /> C D E Transportation Research Board,Highway Capacity Manual. <br /> Special Report 209.Washington,DC:TRB,1985. <br /> a. Two-Lane <br /> b. Level 7,901 13,500 35,500 <br /> c. Rolling 5,200 8,000 14,800 <br /> d. Mountainous 2,400 3,700 8,100 <br /> e. Four-Lane 25,200 30,900 35,500 <br /> f. Six-Lane 37,000 43,300 53,000 <br /> g. Eight-Lane 50,400 61,800 71,000 <br /> TYPICAL TRAFFIC GENERATION BASE UNITS <br /> Type Of Land Use Daily Traffic Generation Unit Rate Institute of Transportation Engineers,Trip Generation,5th ed. <br /> Washington,DC:ITE,1991. <br /> 24. Retail <br /> a. Shopping For facilities under 570,000 square feet LnM=0.625 Ln(x)+5.985 <br /> For facilities over 570,000 square feet Ln(T)=0.756 Ln(x)+5.154 <br /> b. Convenience Average 740 trips per weekday <br /> c. Restaurant 6.57 trips per seat <br /> d. Supermarket(same as for shopping) <br /> For shopping center uses,rates for the indicated trips are reduced <br /> by 30 percent to factor pass-by trips to retail facilities.Convenience <br /> centers have a pass-by rate of 40 percent. <br /> 25. Residential(Per Dwelling) <br /> a. Single-Family Houses and Four-Bedroom Townhouses 9.6 per unit <br /> b. All Others Except Retirement(elderly) 6.0 per unit <br /> c. Retirement Community 3.3 per unit <br /> 26. Office <br /> a. General LnM=0.75 Ln(x)+3.77 <br /> b. Medical 34.2 per 1,000 GFA <br /> c. Office Park 11.4 per LOW GFA <br /> 27. Industrial <br /> a. General Light 7.0 per 1,000 GFA <br /> b. Industrial Park 7.0 per 1,000 GFA <br /> c. Manufacturing 3.8 per 1,000 GFA <br /> d. Warehousing 4.9 per 1,000 GFA <br /> 28. Hotel(per room) 8.7 <br /> 29. Mixed-Use External Trip Reduction Factor -25% <br /> 30. Cost Per Foot of Road Improvement $189 <br /> GFA=Gross floor area <br /> Ln=Natural log <br /> T=Total trips"in"plus"out" <br /> x=Size in 1,000 square feet of gross floor area <br /> 264 <br />