Transportation Effects
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Chapter 3.0 Transportation Effects This chapter describes the existing and planned transportation systems, services and facilities in the Purple Line corridor, explains how the No Build Alternative and the Preferred Alternative would potentially impact them, and identifies mitigation strategies to offset unavoidable effects. This chapter is organized by transportation category. Categories covered in this chapter include public transportation services, the roadway network, bicycle and pedestrian facilities, parking facilities, and freight railroad services and facilities. Changes to this Chapter since the AA/DEIS This chapter, previously Chapter 3: Transportation and Traffic, in the Alternatives Analysis/Draft Environmental Impact Statement (AA/DEIS) has been updated since publication of the AA/DEIS. The future year of analysis, the horizon year, has been advanced from 2030 to 2040. As noted in Chapter 1.0, FTA requires that a project sponsor quantify measures using at least a 20-year horizon. The AA/DEIS, completed in 2008, used a horizon year of 2030; five years later, the Final Environmental Impact Statement (FEIS) uses 2040 to be consistent with the Metropolitan Washington Council of Governments (MWCOG) Transportation Planning Board forecasts. For additional information refer to Purple Line Travel Forecasts Results Report (2013) and Purple Line Traffic Analysis Technical Report (2013). New topics covered in this chapter are freight and passenger railroad facilities, and safety and security. In the AA/DEIS this chapter included a discussion of construction impacts. Because of the advancement of the design of the project, MTA is able to provide a greater level of detail on construction impacts and so this topic is now covered in its own chapter, Chapter 5.0. 3.1 Public Transportation subsequent changes in travel patterns that would result from the introduction of the Purple Line into 3.1.1 Introduction the transportation system. Since that time MWCOG has developed the Round 8.0 Cooperative Forecasts. Long-term operational effects of the Preferred Alternative on public transportation use and This FEIS reflects two changes in forecasting since services were considered by examining forecasted the publication of the 2008 AA/DEIS: (1) the use of ridership demand and potential changes to existing the Round 8.0 forecasts rather than the Round 7.0 facilities once the Purple Line becomes operational. forecasts; and (2) a horizon year of 2040 rather than 2030. The inclusion of the employment shifts The 2008 AA/DEIS was prepared using information resulting from the closure of the Walter Reed Army and data from the MWCOG Round 7.0 Cooperative Medical Center and the transfer of its functions to Land Use Forecasts and a forecasting tool based on the National Naval Medical Center in Bethesda, MWCOG’s regional forecasting model. The pursuant to the Base Realignment and Closure Act, regional model, with a horizon year of 2030, was are the most significant differences between Round used to estimate the No Build conditions and the 7.0 and Round 8.0 within the corridor; there is also Purple Line Final Environmental Impact Statement and Draft Section 4(f) Evaluation 3-1 3.0 Transportation Effects August 2013 some growth in regional population and employ- 3.1.2 Affected Environment ment over the 2030-2040 period. As described in Chapter 1.0, existing rail transit For further information see the Purple Line Travel services in the corridor include three Washington Forecasts Results Report (2013) and the Purple Line Metropolitan Area Transit Authority (WMATA) Validation and Calibration Technical Report (2013). Metrorail lines, all three of Maryland Transit Administration’s (MTA) commuter rail lines (MARC), and Amtrak at New Carrollton. Metrorail The Regional Travel Demand Model trains operate approximately every 4 to 6 minutes during peak periods and 6 to 12 minutes during off A regional travel demand forecasting model is a mathematical representation of the peak periods. availability of transportation facilities (roads More than 75 bus routes provided by Montgomery and transit) and the demand for travel in an County Ride On, Prince George’s County TheBus, urban area. and WMATA Metrobus operate in the corridor. Of The region covered in the MWCOG model these, only 13 provide east-west service, predomi- covers 22 jurisdictions and about 6,800 nately disconnected routes that do not serve the square miles and includes the District of Columbia and parts of three states: corridor from end-to-end. The University of Maryland, Virginia, and West Virginia. Maryland operates Shuttle-UM in much of the corridor; while this service is not open to the The model uses population and employment data, approved zoning, and the highway and general public, it does serve a large number of transit networks, to calculate the expected University of Maryland (UMD) students, faculty, demand for transportation facilities. and employees in the corridor. Metrorail and MARC primarily serve north-south trips in the corridor. The only east-west transit service is provided by buses, whose speed and Ridership reliability is affected by the roadway congestion. In Ridership forecasts are used to gauge the com- addition, county bus services terminate at the parative attractiveness of alternatives under county boundary in the Takoma Park/Langley Park consideration. They are measured in terms of area, so travelers on those services crossing the (1) total and new daily transit trips and (2) peak respective county boundaries must transfer. period boardings by station. Table 1-3 in Chapter 1.0 shows existing scheduled A “transit trip” is defined as the travel of one person transit travel times for trips in the corridor. from trip origin to trip destination, regardless of the 3.1.3 No Build Alternative number of transfers or mode changes required. For example, a trip from home to work, using bus and As described in Section 2.3.1, the No Build Alter- Metrorail, would be counted as one “transit trip.” native includes the existing highway network and The term “passenger” is sometimes used to refer to transit service, plus those transportation improve- a transit trip. ments that have been included in the Financially Constrained Long-Range Plan (CLRP) for imple- A “boarding” is defined as the number of times a person enters a vehicle for travel. A single pas- mentation by 2040, except for the Purple Line. senger’s trip from origin to destination could The end-to-end travel time between Bethesda and include multiple boardings—for example, a New Carrollton on Metrorail is 55 minutes, but this boarding of a Ride On bus, followed by a boarding route does not provide access to any of the inter- of Metrorail. mediate stops that would be available on the Purple Line. 3-2 Purple Line Final Environmental Impact Statement and Draft Section 4(f) Evaluation August 2013 3.0 Transportation Effects The CLRP includes new north-south and east-west Long-term Operational Effects bus service within Prince George’s County, but does not extend new service throughout the Purple Line Total and New Transit Trips corridor. As noted in Chapter 2.0, Montgomery The Preferred Alternative is projected to generate County is evaluating a bus rapid transit network, 28,626 new transit trips for the entire Washington but this is not funded for construction, and is not DC region in 2040. This is an increase of 1.7 percent included in the No Build Alternative. As the No in total regional transit ridership over the No Build Build Alternative would not include a new mode or alternative. Ridership forecasts are shown in new exclusive right-of-way, it is not anticipated to Table 3-1 broken out by the four transit service substantially increase the reliability of the existing types for both work and non-work trips, to show bus system. It is expected that increasing roadway how the Preferred Alternative would shift trips. The congestion will lengthen bus running times and forecasts for 2030 are included for comparison of result in longer travel times for cars and buses. projections to the horizon year previously presented in the AA/DEIS. Both 2030 and 2040 ridership Automobile travel times for a trip between Bethesda forecasts in this FEIS use the Round 8 Cooperative and New Carrollton are expected to increase by Forecasts. approximately 30 percent and 40 percent during the 1 morning and evening peak periods, respectively. Travel Patterns The projected bus transit travel time between Travel forecasts show that while there is consider- Bethesda and New Carrollton is anticipated to able existing transit travel within the Purple Line increase to 108 minutes under the No Build Alter- corridor itself, the majority of transit trips in the native. This condition will decrease the reliability of Purple Line corridor have an origin or destination the bus service, impair its ability to meet its outside the corridor. For example, many transit operations schedule, and adversely affect the trips that begin or end in the corridor are part of a predictability of expected headways and transit trip that extends into Washington DC or areas to travel times. the north of the Purple Line corridor. These trips commonly use the Metrorail Red, Green, and 3.1.4 Preferred Alternative Orange Lines, especially in the Shady Grove/ Rockville area and the Glenmont area. While the The Preferred Alternative, described in detail in major activity centers in the corridor account for Section 2.3.2, would provide new east-west light rail the majority of the trips, a substantial number of transit (LRT) service between Bethesda and New these transit trips are associated with areas in Carrollton. The Preferred Alternative would travel between the Metrorail lines, and depend on street- in dedicated or exclusive transit lanes for 13.9 miles running bus service operating in congested mixed of its 16.2-mile length, allowing the Purple Line to traffic.