Given: Cross-classification data for the Jeffersonville Transportation Study Area Develop the family of cross-classification curves. Determine the number of trips produced (by purpose) for a traffic zone containing 500 houses with an average household income of $35,000. (Use high = $55,000; medium = $25,000; low = $15,000.)
What will be an ideal response?
From the graphs above, the following tables can be produced.
Next, develop a table to show the number of households owning x vehicles. This
can be accomplished by multiplying the values found in the table of the number of
HH per level of income and the percentage of HH owning x vehicles together.
For example:
For low income level and 0 auto ownership = (62) × 26% = 16
For medium income level and 0 auto ownership = (363) × 3% = 11
For high income level and 0 auto ownership = (75) × 0% = 0
This procedure is used to generate the following table.
The number of trips by purpose can then be calculated as follows:
HBW = (0.38 × 399) + (0.37 × 3530) + (0.18 × 1400) = 1,710
HBO = (0.34 × 399) + (0.34 × 3530) + (0.38 × 1400) = 1,868
NHB = (0.28 × 399) + (0.29 × 3530) + (0.44 × 1400) = 1,751
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