requirements contracts for engineering design and related services ...

11. The Consultant shall prepare a balanced traffic flow map and perform levels of service (LOS) analyses using the
latest version of the Highway Capacity Software (HCS) or other software (i.e., CORSIM, AIMSUN, VISSIM, SYNCHRO,
etc.) to be approved by NYCDOT for each analysis peak hour for the existing and future (design year with and without the
project) conditions. In addition, a balanced traffic flow map and LOS analyses for estimated time of construction
completion (ETC) shall also be prepared for each analysis peak hour. All signalized and unsignalized intersections that
are identified for operational and safety concerns shall be included in LOS analyses. Accordingly, the Consultant shall
recommend appropriate improvement measures as required.
12. The Consultant shall determine the future level of service based on the projection of traffic volumes that are expected
to occur within the estimated time of construction completion plus the expected service life of the project (Design Year).
The Consultant shall use ETC+20 for design year traffic forecast, unless otherwise directed by the Commissioner. The
New York State Department of Transportation’s (NYSDOT) guidelines shall be followed if the project receives state or
federal funds.
Pavement preventive and corrective maintenance as well as safety-related work do not usually require the design year
traffic forecast. Year ETC+5 peak hour turning movement volumes should be determined for proposed signal installations
that will meet the signal warrants in the design year, but do not meet the warrants for ETC+0.
Future LOS analysis shall be performed for both the no-action (future without the project) and action (future with project)
conditions. The growth rate, presented in Exhibit 1 of Appendix III of NYCDDC Design Guidelines and Directives, used in
determining the projected traffic volumes shall be subject to approval by the Commissioner.
13. The Consultant shall use Mid-LOS “D” design criteria for project improvements that apply to intersection lane
group(s) rather than the intersection approach or overall intersection. If future operation of a lane group exceeds mid-
LOS “D”, reasonable and feasible traffic improvement measures must be recommended so that the lane group is returned
to mid-LOS D in the design year without adversely affecting another lane group. Identification of feasible and practical
improvement measures should also be guided by NYCDOT’s 2009 Street Design Manual, the detailed guide to the City’s
transportation policies.
14. The Consultant shall submit its draft findings and recommendations from the various studies performed under this
task in a Traffic Study report to the Commissioner and shall revise the report in accordance with comments provided by the
Commissioner.
15. Upon acceptance of the Traffic Study report by the Commissioner, the Consultant shall incorporate the results
and recommendations of the traffic study into the other tasks included in the Specific Requirements for the Project.
4.4 HARDWARE AND BASIN CONDITION INVENTORY
1. Under this task the Consultant shall prepare hardware condition inventory of all existing City-owned (includes public
authorities) manholes, catch basins/inlets, valve boxes, seepage basins, etc., and all related hardware including frames,
adjustment rings, and covers within the project limits.
2. The Consultant shall visit the site and verify the existence of all City owned hardware (including public authorities)
shown on the topographic survey within the project limits, reconcile any City- owned hardware discrepancies and correct
the topographic survey. In addition, the Consultant shall perform a visual inspection of the interior/exterior of all existing
City-owned hardware and shall:
i) Identify the Size of manhole covers (not including the frame), condition of manhole covers and frames,
material (brick/concrete/other) and condition of manhole structures;
ii)
Identify the size and type of basins/inlets, with or without curb piece, condition of frame, grating & curb piece,
material and condition of basin structures, determine if catch basin has a hood over the connecting pipe;
iii) Identify the Owner/Agency responsible for a particular piece of hardware;
NYC Department of Design and Construction
Infrastructure, October 2012
GR-25