Transportation Science articles

Recent articles from Transportation Science

Empirical features of congested traffic states and their implications for traffic modeling.
May 1, 2007... We address the controversial issue of traffic flow modeling, whether first-order, second-order, or other traffic models are best supported by empirical facts and theoretical considerations. This is done by a critical discussion of the pros and cons of the different theoretical approaches and...

Real-time freeway traffic state estimation based on extended Kalman filter: a case study.
May 1, 2007... This paper presents a case study of real-time traffic state estimation. The adopted general approach to the design of universal traffic state estimators for freeway stretches is based on stochastic macroscopic traffic flow modeling and extended Kalman filtering, which are outlined in the...

A sequential stochastic security system design problem for aviation security.
May 1, 2007... Passenger screening is a critical component of aviation security systems. This paper introduces the sequential stochastic security design problem (SSSDP), which models passenger and carry-on baggage-screening operations in an aviation security system. SSSDP is formulated as a two-stage model,...

Modeling discrete choices in the presence of inertia and serial correlation.
May 1, 2007... The concept of habit or inertia in the context of (reluctance to) change in travel behavior has an important bearing on transport policy (e.g., how to break car use habits) and has remained an unresolved issue in demand modeling. Another major problem in modeling the response to policy...

Reducing truckload transportation costs through collaboration.
May 1, 2007... In the highly fragmented truckload transportation industry a substantial fraction of truck movements involves empty trucks, i.e., moves that reposition trucks. However, reducing the amount of truck repositioning is difficult because the need for a carrier to reposition its trucks depends on...