TRANSPORTATION ENGINEERING/COASTAL& HARBOUR ENGINEERING/HYDRAULIC ENGINEERING

Abstract

Travel time is one of the most important measures of transportation systems performance and service quality. Other measures such as fuel consumption, vehicle emissions, and accidents are related to travel time. Travel Time Reliability is defined; ability of travelers to predict travel time for a trip and to arrive at destination within an “on-time window” (Margiotta, 2002). Measured by how travel time of a trip varies from one time period to another. In this study, the definition and the computation methods of travel time reliability are presented together with the literature review. Also, an investigation is conducted on travel time reliability the origin and the destination points of Kozyatagi and Okmeydani driving on Bosporus or Fatih Sultan Mehmet (FSM) Bridges respectively. As a result, some suggestions are introduced for Istanbul to improve the travel time reliability. Average Travel time between Kozyatagi and Okmeydani are 46.3 min. driving on Bosphorus Bridge route and 38.9 min. Driving on FSM (Fatih Sultan Mehmet) bridge route during morning peak period. During this time, 90% reliable travel times are computed as 62 min. for Bosphorus Bridge route and 48 min. for FSM Bridge route. In other words, if the traveler wants to be 90% reliable at the scheduled meeting during the weekday peak period, he/she has to drive 16 min. for Bosphorus Bridge route and 9 min. for FSM Bridge route in advance before the expected travel time between Kozyatagi and Okmeydani..