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This research paper presents the evaluation of trigger level at equilibrium conditions when the number of users are equal for both private vehicles and public transport in order to investigate the impact arising from the new KTM Klang Commuter Station Park and Ride. Users always seek for a faster and more convenient method of transportation apart from driving themselves due to traffic congestions. The main focus of this research is the trigger level conditions that are involving people’s decision on their mode of transport. The first stage of the trigger level is to investigate the possible of choices of decision on transport people make before embarking on their daily journey. The second stage of trigger level is route optimization since public transports route must be better in term of delays than those of private vehicles route. The last stage is to identify trigger levels of private vehicles and public transport user’s equilibrium conditions when to park their private vehicles. Various factors such as the amount of time the users spend on finding affordable parking spaces downtown is taken into consideration. The study case is conducted at Klang Town where the authority is planning to construct a new Park and Ride at KTM Klang Commuter Station. The trigger level at equilibrium conditions when private vehicles equal to public transports users need to be evaluated in order to attract private users switch their mode of transport from private to public transportation to ensure traffic flow is smooth at Klang Town.