Draft Project Impact Report - Boston Redevelopment Authority

Exeter Residences\888 Boylston
\\Mabos\projects\09916.00\docs\Permits\DPIR\Text\DPIR Chapter 4
Transportation081208-clean.docx
However, in response to comments on the NPC/PNF, this DPIR includes a
supplemental analysis of the Exeter Street corridor between Boylston Street and
Huntington Avenue which, for simplicity, evaluates the impact of site generated
trips for the full build condition (Exeter Street up to 188 apartments and 17 stories for
888 Boylston together). This supplemental analysis also provides a detailed analysis
of the Exeter Street and Blagden Street intersection.
4.2 Summary of Key Transportation Findings
The transportation analysis conducted for the Exeter Residences and 888 Boylston
and included in the NPC/PNF demonstrated that adequate roadway capacity exists
along Boylston Street and Huntington Avenue as well as the study area intersections,
during peak hour traffic conditions. The supplemental analysis completed, and
included in this DPIR, further indicates that Exeter Street and Blagden Street also
show adequate capacity for handling peak traffic conditions. The small difference in
site-generated vehicles, pedestrian and transit trips compared to the development
program approved in the original Development Plan can be accommodated within
the existing transportation networks. A summary of key findings of the
transportation analysis as originally presented in NPC/PNF for the two buildings
and supplemental analyses conducted for the Exeter Street/Blagden Street
intersection is as follows:
The highest combination of background and site-generated traffic will occur
during the evening commuter peak hour between the hours of 4:00 to 6:00 PM,
representing the critical analysis period for the Exeter Residences and 888
Boylston.
The Exeter Residences program alone will generate approximately 20 vehicle
trips in the weekday morning peak hour and 26 vehicle trips in the weekday
evening peak hour while the 888 Boylston program is expected to generate
approximately 199 and 201 vehicle trips during the weekday morning and
evening peak hours respectively. The Exeter Residences and 888 Boylston
together are projected to generate 219 vehicle trips during the weekday morning
peak hour and 227 vehicle trips during the evening peak hour. Compared to the
originally approved Development Plan program (which included an 11-story
Boylston Street building) the Exeter Residences and 888 Boylston Street
represent a net increase of 83 vehicle trips in the morning peak hour and 80
vehicle trips in the evening peak hour. It is anticipated that a majority of the trips
made to the site will be transit or pedestrian (walking) trips.
The traffic analyses were conducted to evaluate the impacts of the Exeter
Residences and 888 Boylston buildings. The signalized intersections along Exeter
Street will operate at an acceptable level of service (LOS) of D or better, during
Transportation 4-3