Abstract

This study's focus is on modeling vehicle acceleration-deceleration behavior during freeway and ramp maneuvers in congested traffic. Presented are methodologies for collecting field data, analyzing freeway merging behavior data and developing and calibrating ramp vehicle accelerating models. Substantial data were collected using videotape and image processing techniques. The entrance ramps in the Tokyo Metropolitan Expressway were used for comprehensive traffic surveys. The paper presents a theoretical framework for modeling the ramp driver acceleration-deceleration behavior. The methodology uses the stimuli-response psychophysical concept as a fundamental rule and is formulated as a modified form of the car-following models. The findings could serve future highway geometric design criteria revision, and the mathematical framework of the developed model may be appropriate to study more driver behavioral aspects of congested freeways. Document type: Part of book or chapter of book

Abstract

90% of the time needed for the conversion from point clouds to 3D models of industrial facilities is spent on geometric modelling due to the sheer number of Industrial Objects (IOs) of each plant. Hence, cost reduction is only possible by automating modelling. Our previous work has successfully identified the most frequent industrial objects which are in descending order: electrical conduit, straight pipes, circular hollow sections, elbows, channels, solid bars, I-beams, angles, flanges and valves. We modelled those on a state-of-theart software, EdgeWise and then evaluated the performance of this software for pipeline and structural modelling. The modelling of pipelines is summarized in three basic steps: (a) automated extraction of cylinders, (b) their semantic classification and (c) manual extraction and editing of pipes. The results showed that cylinders are modelled with 75 % recall and 62 % precision on average. We discovered that pipes, electrical conduit and circular hollow sections require 80 % of the Total Modelling Hours (TMH) of the 10 most frequent IOs to build the plant model. TMH was then compared to modelling hours in Revit and showed that 67 % of pipe modelling time is saved by EdgeWise. This paper is the first to evaluate state-of-the-art industrial modelling software. These findings help in better understanding the problem and serve as the foundation for researchers who are interested in solving i Document type: Part of book or chapter of book