CE221 Transportation Planning HW2

CE221 Transportation Planning HW2 - (3825 - 3044) / 3044=...

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CE221 Transportation Planning HW#3 a) 170 trips / 20 households = 8.5 The average number of trips per 20 Sacramento households is 8.5. b) Average Number of Trips Per Vehicles Owned and Income Earned Number of Vehicles Owned 1 2 3+ Low Income 4.5 7 8 High Income 0 8.75 12.33 Low Income is less than or equal to $55,000. High Income is higher than $55,000. c) i. (8.5 trips/household) x (450 households) = 3825 daily trips. ii. 450 households / 6 categories = 75 households each. (75 * 4.5) + (75 * 7) + (75 * 8) + (75 * 0) + (75 * 8.75) + (75 * 12.33) = 3044 daily trips iii. Percent Difference:
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Unformatted text preview: (3825 - 3044) / 3044= 0.257 x 100 = 25.7% The percent difference between the two calculated daily trips is 25.7%. iv. I prefer the cross classification method because even though it might take more time, I think that it has a more accurate end result. Exercise 4.11 Gravity Model Calculations for Example 4.5 with b= -2.8 1 2 3 4 5 6 7 Zone j A(j) t(2j) F(2j) A(j)F(2j) AF(j)/sum(AF ) T(2j) 1 4909 35 0.047 230.72 0.026 23 2 774 5 11.04 8544.96 0.963 867 3 174 20 0.2276 39.6024 0.004 4 4 69 12 0.951 65.619 0.007 7 Totals 5926 8880.90 1.0 901...
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This note was uploaded on 04/01/2008 for the course CE 221 taught by Professor Staff during the Winter '04 term at Cal Poly.

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