793 CETRA 2022 11-13 May 2022, Pula, Croatia 7 th International Conferenceon Road and Rail Infrastructure PASSENGER DATA COMPLEXITY IN TRAM STOP DWELL TIME MODELLING Maja Ahac 1 , Leonard Cvitić 2 , Igor Majstorović 1 , Saša Ahac 1 , Silvio Bašić 1 1 University of Zagreb, Faculty of Civil Engineering, Croatia 2 Neborex d.o.o., Croatia Abstract The stop dwell time can be modelled by using the volumes of boarders and alighters, and it is a common conclusion that the use of additional information on the number and width of doors, number of seats, and number of through standees in model creation improves its es- timation of stop dwell time. However, such an approach demands detailed knowledge and/ or assumptions on passenger distribution both inside the vehicle and on the stop platform, which makes the model creation and its application more challenging. The research pre- sented in this paper is focused on the passenger input data requirements for the creation of tram stop dwell time prediction models. It is based on passenger and tram dwell time data collected at an island tram stop in Zagreb. The data acquisition included the field record- ing of the trams in operation during five working days, laboratory processing of 70 hours of collected video data, and creation of a synthesized database of observed and measured data. Three different multiple linear regression models for tram dwell time prediction were created, with the following independent variables: (1) the volume of boarders and alighters and a type of passenger flow transiting through the busiest tram doors, (2) the volume of boarders and alighters transiting through the busiest tram doors, and (3) the total volume of boarders and alighters per tram. The cross-validation of the model showed that passenger input data simplification has a minor effect on the model’s goodness of fit, and a mild effect on it’s accuracy and precision, which could be adequately addressed by the application of a larger operating margin. Keywords: island stop, passenger volume, passenger flow, alighters, boarders 1 Introduction The stop dwell time is defined as the difference between the public transport (PT) vehicle departure and arrival times. The arrival time is defined as the time when the vehicle changes its state from moving to standing still, and vice versa for the departure time. There are at least five processes between the arrival time and the departure time: door unlocking, door opening, passengers alighting and boarding, door closing, and vehicle dispatching [1]. The stop dwell time prediction is a major issue in urban PT vehicle travel speed modelling, used for the definition of travel time and timetable creation. This is due to numerous stop dwell time influential factors, variable both in space and time, like passenger flow, vehicle and stop design characteristics, and traffic organization. This problem is especially pronounced on high-frequency and high-ridership PT systems, with long routes, and consecutive stops that are relatively close to one another [2], such as tram systems. INFRASTRUCTURE AND TRAFFIC PLANNING AND MODELLING DOI: https://doi.org/10.5592/CO/CETRA.2022.1427