Comprehensive Transportation Review Cotton Annex Redevelopment Washington, DC February 8, 2021 ZONING COMMISSION District of Columbia CASE NO.20-34 EXHIBIT NO.9A Prepared by: 1140 Connecticut Ave NW 3914 Centreville Road 15125 Washington Street 225 Reinekers Lane Suite 600 Suite 330 Suite 212 Suite 750 Washington, DC 20036 Chantilly, VA 20171 Haymarket, VA 20169 Alexandria, VA 22314 T 202.296.8625 T 703.787.9595 T 571.248.0992 T 202.296.8625 www.goroveslade.com This document, together with the concepts and designs presented herein, as an instrument of services, is intended for the specific purpose and client for which it was prepared. Reuse of and improper reliance on this document without written authorization by Gorove/Slade Associates, Inc., shall be without liability to Gorove/Slade Associates, Inc. Cotton Annex Redevelopment – Comprehensive Transportation Review (CTR) i February 8, 2021 CONTENTS Executive Summary ................................................................................................................................................................................... 1 Introduction ................................................................................................................................................................................................. 4 Purpose of Study .................................................................................................................................................................................... 4 Project Summary .................................................................................................................................................................................... 4 Contents of Study ................................................................................................................................................................................... 5 Study Area Overview .................................................................................................................................................................................. 8 Major Transportation Features ............................................................................................................................................................... 8 Future Projects ..................................................................................................................................................................................... 10 Project Design .......................................................................................................................................................................................... 18 Site Access and Circulation .................................................................................................................................................................. 18 Loading and Trash ............................................................................................................................................................................... 18 Parking ................................................................................................................................................................................................. 19 Bicycle Facilities ................................................................................................................................................................................... 19 Pedestrian Facilities ............................................................................................................................................................................. 19 Transportation Demand Management .................................................................................................................................................. 19 Travel Demand Assumptions ................................................................................................................................................................... 23 Existing Site Trip Generation ................................................................................................................................................................ 23 Approved Site Trip Generation ............................................................................................................................................................. 23 Proposed Site Trip Generation ............................................................................................................................................................. 23 Traffic Operations ..................................................................................................................................................................................... 25 Study Area, Scope, & Methodology ...................................................................................................................................................... 25 Vehicular Analysis Results ................................................................................................................................................................... 29 Mitigation Measures ............................................................................................................................................................................. 31 Transit Facilities ....................................................................................................................................................................................... 54 Existing Transit Service ........................................................................................................................................................................ 54 Proposed Transit Service ..................................................................................................................................................................... 54 Site-Generated Transit Impacts ............................................................................................................................................................ 54 Pedestrian Facilities ................................................................................................................................................................................. 58 Pedestrian Study Area ......................................................................................................................................................................... 58 Existing Pedestrian Infrastructure ......................................................................................................................................................... 58 Site-Generated Pedestrian Impacts ..................................................................................................................................................... 58 Bicycle Facilities ....................................................................................................................................................................................... 63 Existing Bicycle Facilities...................................................................................................................................................................... 63 Planned Bicycle Improvements ............................................................................................................................................................ 64 Gorove Slade goroveslade.com Cotton Annex Redevelopment – Comprehensive Transportation Review (CTR) ii February 8, 2021 Proposed Bicycle Improvements .......................................................................................................................................................... 64 Site-Generated Bicycle Impacts ........................................................................................................................................................... 64 Safety Analysis ......................................................................................................................................................................................... 67 Summary of Safety Analysis ................................................................................................................................................................. 67 Potential Impacts .................................................................................................................................................................................. 67 Summary and Conclusions ....................................................................................................................................................................... 69 Gorove Slade goroveslade.com Cotton Annex Redevelopment – Comprehensive Transportation Review (CTR) iii February 8, 2021 LIST OF FIGURES Figure 1: Site Location ............................................................................................................................................................................... 6 Figure 2: Site Aerial .................................................................................................................................................................................... 7 Figure 3: Summary of Site Walk Score and Bike Score 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