Journal of Civil Engineering Science & Technology Vol. 03/No. 01/ April 2022 1 SELECTION MODELS OF JAYA UTAMA AND SUGENG RAHAYU BUS ROUTES USING THE INCREMENTAL ASSIGNMENT METHOD (CASE STUDY: PURABAYA TERMINAL – TERBOYO TERMINAL) Fauzan Rokhimi 1 , Nugroho Utomo 2* , Ibnu Sholichin 3 1 2 3 Civil Engineering Study Program, University of Pembangunan Nasional "Veteran" East Java *E-mail correspondent: nugroho.ts@upnjatim.ac.id Abstract Pattern of interactions that occurred between Surabaya City and Semarang City is not only limited to economic factors but more than it takes place in all aspects of social life. People which are located outside of Semarang City area will try to choose the fastest route from several routes that connect between the zones of origin to Semarang City. This research is conducted based on the factors that influence the process of selecting travel routes from Surabaya City to Semarang City using the intercity- interprovincial bus transportations. This study using the incremental assignment method because it can be executed to determine the relationship between traffic flow and vehicle travel time, not depending on the assumptions of road users and the characteristics of the road network. The results of simple linear regression analysis, obtained a flow-cost relationship model on route A (Terminal Purabaya - Nganjuk - Ngawi - Solo - Ungaran - Terminal Terboyo) the form of the equation is YA = 48.937 + 0.022X. While the flow-cost relationship model on route B (Terminal Purabaya - Gresik - Lamongan - Tuban - Rembang - Kudus - Terminal Terboyo) the form of the equation is YB = 36,822 + 0.034X. The coefficient of determination (R 2 ) on route A is 0.6 and on route B the result is 0.4. The final result of loading the travel route with a uniform loading fraction of 5% obtained a Wardrop Equilibrium convergence value of 0.0065 Keywords: simple linear regression analysis, incremental assignment method, travel route selection. Article Info Submitted 19 January 2022 Revised 24 May 2022 Accepted 24 May 2022 INTRODUCTION Availability and usage of transportations mode affect road user to the trip routes selection process. Trip routes selection process can be defined as a movement between two zones (which obtained from trip distribution stages) for determined mode (which obtained from modal choice stages) imposed to existing route which contained of exact road network links [1]. Public transportations modal choice such as bus still become a main options for ordinary people who nearly unwanted to using private vehicles with time efficiency and travel cost considerations. The emergence of movement between zones basically will never be separated from development plans. The regional development plan that is being or will be carried out is predicted to have a strong influence toward high activity of movement between zones. This influence, if not balanced with efforts to supporting fluency of transportations activity, can causing problems such as loss of travel time and many things that affecting the consideration of trip route selection [2]. Pattern of interactions that occurred between Surabaya City and Semarang City is not only limited to economic factors but more than it takes place in all aspects of social life. People which are located outside of Semarang City area will try to choose the fastest route from several routes that connect between the zones of origin to Semarang City. This research is conducted based on the factors that influence the process of selecting travel routes from Surabaya City to Semarang City using the intercity- interprovincial bus transportations. This research use the incremental assignment method to complete task sequences of route selection. In this study, there were two routes that reviewed, namely route A (Terminal Purabaya - Nganjuk - Ngawi - Solo - Ungaran - Terminal Terboyo) with Sugeng Rahayu Bus Company and route B (Terminal Purabaya - Gresik - Lamongan - Tuban - Rembang - Kudus – Terboyo Terminal) with Jaya Utama Bus Company. Determining of object studies Sugeng Rahayu and Jaya Utama Bus Company according to the number of passengers whom feel comfortable with equipped service facilities from those bus are achievable tariff, wireless fidelity (Wi-Fi) on bus, rest room and others.