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(also known as internal capture). A shared trip is defined as one that goes to more than
one land use on the site.
The number of pass-by, diverted-link, and shared trips was determined based on
information published in ITE’s Trip Generation Handbook. 19 A pass-by rate of 32
percent and a diverted-link rate of 26 percent were applied to the retail-generated
traffic. All other land uses at the redeveloped base area are not expected to generate
pass-by or diverted-link trips. The overall internal-capture rate for the
redevelopment of the NASB is expected to be approximately 6 percent. This
reduction for shared trips is reflected in Table 3.3-2.
Distribution
The directional distribution of the new trips generated by the NASB redevelopment
was based on output from the Gateway I Corridor Travel Demand Model, a review
of the residents-to-workplace flows of surrounding communities, 20 and existing
travel patterns. Table 3.3-3 summarizes the distribution used to assign new trips to
the Study Area roadway network. The distribution of pass-by trips was based on
existing travel demands on the adjacent roadways (i.e., Bath Road/State Route 24,
Harpswell Road/State Route 123, and Gurnet Road/State Route 24). The distribution
of diverted-link trips was based on existing travel demands on US Route 1.
Table 3.3-3. Trip-Distribution Summary
Direction To/From Travel Route Percentage of Trips
North I-295 8.0
Route 24 6.0
Route 201 3.8
River Road 3.0
Old Augusta Road 0.2
South I-295 14.0
Main Street (Topsham) 5.0
Route 24 3.0
Route 123 2.0
East US Route 1 20.0
Bath Road 4.0
West Route 196 9.0
US Route 1 8.0
Other Locations* Local 14.0
Total 100.0
*Origin and destination locations in the Study Area that are not official Study Area roadways.
19 Trip Generation Handbook, published by the ITE, Washington, DC, March 2001.
20 Source: BNAS Transportation Study Socioeconomic & Real Estate Market Baseline Conditions Brunswick and
Topsham, Maine, prepared by RKG Associates, Inc., December 2009 (draft).
Future Conditions 80