The initial zone structure for regional travel demand model has been proposed as summarized below. Name three potential problems with this structure.
Zones: 50
Employment: 100,000
Labor Force: 60,000
Population: 200,000
Trips produced by the study area: 100,000
Trips attracted by the study area: 150,000
What will be an ideal response?
The three problems are:
? The ratio of labor force to employment is 60,000/100,000 = 0.60, meaning
that a substantial number of workers are imported into the study area but
not considered within the regional model.
? With 200,000 people and 50 zones, we have an average of about 4,000
people per zone, whereas an average of 1,000 people per zone is desired.
? The number of trips produced and attracted by the area are not equal. (If
students have already discussed productions and attractions, then it may be
noted that the ratio of productions to attractions is 100,000/150,000 or
about 0.67, which is outside of the desired heuristic rule of 0.9 to 1.1.)
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