BUS STOP CAPACITY
CE 434 – PUBLIC TRANSPORTATION ASSIGNMENT 4: BUS STOP CAPACITY DUE DATE: 3/22/24 For this assignment, you can work in groups of up to four students or individually if you prefer. Each group should submit one write-up answering the five questions on the following page. Please include all of your names and a brief description of how each member contributed to the solution. Upload your solutions on eCampus (see Assignments➔HW4). All responses should be typed. Background This assignment provides you with experience conducting bus capacity calculations. The dataset you will use is adapted from actual data provided by the Washington Metropolitan Area Transit Authority (WMATA) in Washington DC. WMATA is considering building an exclusive busway in the median of K Street in downtown Washington DC (see Figure 1). After conducting ride checks on various bus routes operating along the K Street corridor, WMATA has determined that the intersection of K Street with 17th Street and Connecticut Avenue has the highest passenger volume. Figure 1: K Street & 17th Street/Connecticut Avenue Intersection (Source: Google Maps) Dataset WMATA has asked you to conduct a dwell time analysis and bus stop loading capacity analysis using a dataset that they have provided from field measurements. The data can be found in an Excel spreadsheet on eCampus (see Assignments➔HW4). The spreadsheet includes AM and PM peak period dwell time observations for eastbound and westbound bus routes that stop along K Street at 17th/Connecticut. Each row is an observation of a bus arrival at K Street intersection in which a clock was used to measure three pieces of data. Each of these observations begins at 0 seconds. The columns provided in the dataset are as follows: ➢ Doors Open: Seconds after the bus comes to a stop when the door opens. ➢ Main Flow Stops: Seconds after the bus comes to a stop when all passengers have boarded/alighted. ➢ Doors Close: Seconds after the bus comes to a stop when the doors have closed. ➢ Bus Leaves: Seconds after the bus comes to a stop when the bus starts to pull-out from the stop. Boarding and alighting counts are included from approximately 2 hours of observations in each time period and direction. Use this entire 2-hours as your peak period. Questions Part 1: Dwell Times Question 1: Calculate the average dwell time for each direction for the AM and PM peak periods based on the given data. When using this data for calculations, please refer to the TCQSM definition of dwell time, and you may find Appendix B of Chapter 6 particularly helpful. Note: Please refer to the TCQSM for which cases with delay should be included in the dwell time and which should not. Question 2: Calculate the coefficient of variation for dwell time for each direction for the peak hour. Which direction has the most variability? Question 3: Compare the average dwell time and coefficient of variation values that you calculated to the default values provided in the TCQSM. Question 4: Bicycling is on the rise in Washington DC. Since the field data on dwell times was collected, WMATA believes that there are significantly more passengers loading their bicycles onto transit vehicles throughout the city. The TCQSM estimates that the process of loading bicycles on bus bike racks takes approximately 20-30 seconds. Subsequently, concerns have been raised about significantly higher dwell times than those based on the data used for your calculations in question 1. In light of these concerns, briefly discuss two strategies that could be used to reduce dwell times for the proposed busway at the K Street and 17th/Connecticut. (Tip: Refer to the TCQSM, Ch 6 for interventions and other strategies.) Part 2: Loading Area Capacity Calculation Question 5: Based on your dwell time calculations from question 1, estimate the loading area capacity for each direction (buses/hour). Assume that the traffic signal cycle on K Street is C=80 seconds and the amount of green time for K Street at 17th/Connecticut is g=30 seconds. Additionally, assume that the total clearance time is tc=15 seconds, and the Z value corresponding with the desired failure rate is Zcv=1.280. Note: Make sure to attach your calculation sheet or provide an example of your calculations so that I can identify any mistakes made.
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