Modeling

This report describes the development and application of transyt display, an interactive microcomputer program to produce plots of a signalized network and its input and output values from the widely used transyt simulation and optimization model. The program can display on a monitor screen both input data and measures of traffic performance for each link and node of the particular network. Any display can be printed, and the user has considerable flexibility in selecting plot size, and including captions to the plot. The report presents several applications of the program. Future program...

For this study, we developed one of the first statewide pedestrian exposure models, using log-linear regression to estimate annual pedestrian crossing volumes at intersections on the California State Highway System. We compiled a database of more than 1,200 count locations, one of the largest ever used to create a pedestrian volume mode. We initially evaluated 75 explanatory variables for the model. The final model is based on the three land-use variables (employment density, population density, number of schools), four roadway network variables (number of street segments, intersections...

A go-around is an aborted approach of an aircraft. We model go-around occurrence using Principal Component Logistic Regression (PCLR). This entails go-around detection, feature engineering, and model estimation. As a case study, we consider John F. Kennedy (JFK) International Airport arrivals, and model go-around occurrence based on information available when the subject flight is five nautical miles from its landing runway threshold. The PCLR model is based on Principal Component Analysis (PCA) for analyzing data that suffer from multi-collinearity. The model provides a representation of...

We study airline decision-making in response to the Federal Aviation Administration’s Airspace Flow Program (AFP) to empirically describe policy-relevant behavioral strategies and preference structure of air carriers. Using observed responses made by airlines, we infer utility functions of different route options in AFP with respect to flight time and arrival delay using a finite mixture latent class choice model. We empirically describe the trade-off that airlines face between flight time and departure or arrival delay. The average estimated cost of airborne delay is 24 times greater than...