Assumptions
Consultant assumes:
A-1. — The City of Nashua will be the primary designer on the project, will be the engineer of record, and
will lead and coordinate all efforts unless otherwise noted. Specific efforts to be led by Hoyle
Tanner include the Road Diet Feasibility Study and preparation of Opinions of Probable Cost.
Hoyle Tanner will also provide Quality Assurance/Quality Control on certain design tasks, and the
anticipated hours for each of these estimates is noted. Design tasks that do not include effort
from Hoyle, Tanner are shown in italics.
A-2.— The project will include crosswalk visibility enhancements and RRB’s at up to 5 locations.
Crosswalk visibility enhancements only will be performed at an additional 10 locations.
A-3. Road Diet Feasibility Study Assumptions
The anticipated limits of the reduction to one lane of travel in each direction (Road Diet)
are along Main Street from north of West/East Hollis Street to south of Water Street as
depicted on in the City’s 2021 Master Plan (Imagine Nashua).
Intersection Capacity Analysis (utilizing Synchro 10 software) for AM, PM, & SAT peak
periods during the build and no-build scenarios of the opening year and future year (20-
year horizon) will be performed at the following locations:
a. Main/Canal
b. Main/Water
c. Main/Factory
d. Main/High
e. Main/Pearl
f. Main/Hollis
Intersections outside the study area impacted by potential traffic diversion from reduction
to one travel lane in each direction will not be studied.
Corridor Capacity Analysis (utilizing the Highway Capacity Software) will be performed for
two roadway segments along Main Street.
Conversion of Water St, Factory St, West Pearl St, Court St/Park St, and Temple St/ East
Pearl St to two-way traffic, as discussed in the “2015 Downtown Circulation Study” by
VHB, will not be included in the Road Diet Study.
Travel Demand Modeling to determine traffic volume increases/decreases along Main
Street due to conversion to one travel lane in each direction and conversion to two-way
traffic on streets noted above will be performed by the Nashua Regional Planning
Commission (NRPC). NRPC costs for performing this modeling, if applicable, will be paid
by the City outside of the project.
Turning movement counts for all intersections, crash data, and existing signal timing and
phasing will be provided by the City. Average Annual Daily Traffic (AADT) volume data
will be collected from available counts on the NHDOT Transportation Data Management
System. Traffic data collection by Hoyle Tanner will not be required.
Design deliverables for the road diet will include a typical section and a basic plan view
layout for the conversion depicting travel lanes, bike lanes, sidewalks, and rough parking
utilizing aerial photography. Detailed design including layout of landscaping, streetscape
elements, lighting, drainage, transit stops, turning movement review, and sight distance
analysis will not be required.
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