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NYC 9/11 Public Portal Document

0. Traffic and Parking low- or low- to moderate-density development in partic- ular sections of the City. Before undertaking any traffic 100. Definitions or parking analyses, reference should be made to Table 3O-1 to determine whether any numerical analyses are The objective of the traffic and parking analyses is needed. to determine whether a proposed action can be expected to have a significant impact on street and roadway If the proposed action would result in development conditions and on parking facilities. In particular, it greater than the levels shown in Table 3O-1 or if develop- addresses the following major technical areas: ment does not fall in any of the categories in Table 3O-1, a preliminary trip generation analysis—and, possibly, Traffic flow and operating conditions, including the traffic impact analysis—will likely be needed. (If the volume of traffic expected to occur in the future with proposed action involves a mix of land uses, it is the action and the impact of this volume on traffic appropriate to use a weighted average in determining levels of service. The purpose of this assessment is whether further analysis is needed.) For programmatic to evaluate the sufficiency of street and highway actions that would affect more than one area, the thres- elements to adequately process the proposed action's holds in Table 3O-1 may be considered on an area-by- expected traffic flow and operating condition area basis. changes. These development thresholds were determined by Parking conditions, including the occupancy levels applying typical trip generation and modal split assump- of parking lots and garages (public and accessory) as tions for the land uses cited in the table for each of the well as curbside parking spaces. The purpose is to zones, up to a development density whose vehicle and determine what effect the proposed action would transit trip generation would not likely cause significant have on parking resources in the area. impacts, based on a review of many traffic impact studies and EISs conducted previously under the CEQR process. Goods delivery, including the capacity of proposed The development densities cited in Table 3O-1 above loading areas to accommodate the expected volume generally result in fewer than 50 peak hour vehicle trips of deliveries and their ability to do so without (with "trips" referring to trip ends), for which significant interfering with vehicular and pedestrian traffic. traffic impacts are generally unlikely. • Vehicular and pedestrian safety. onincioally focused If development expected under the proposed action on he effect of the or000sed action's enerate is greater than the thresholds indicated in Table 3O-1, a demand at existing preblcm hieh-accident locations preliminary trip generation analysis will generally be and potential future problem gl l locations that may appropriate to determine the volume of vehicular trips become unsafe due to the nronosed action. expected during the peak hour. The methodologies available for use in determining vehicular trip generation To analyze each of these technical areas, specific are presented later in this chapter (Section 341). As technical methodologies, databases, and procedures have described in that section, this involves either: a) utilizing been developed and are referenced in this seetien S11a eI available trip generation rates for the type of land use of the Manual. It is also important to note the relation- proposed and available modal split characteristics ship of these analyses with air quality and noise studies that may need to be conducted. Both the air quality and noise analyses may call for extensive traffic information that needs to be collected and formatted in a manner that can be easily used for air quality and noise analysis purposes. The interrelated needs of these three technical subjects should be kept in mind during the course of the data collection and analysis stages. It may also be necessary to assess traffic impacts on residential streets as part of the neighborhood character studies.

200. Determining Whether Traffic and Parking Assessment are Appropriate

• It is possible that detailed traffic and parking anal- yses may not be needed for actions that would facilitate

CEQR MANUAL 3O-1 10/01

NYC-WTC 000137576