Adaptive cruise control (ACC) systems are currently being developed by automotive manufacturers for highway vehicle automation [3],[4]. An ACC system enhances regular cruise control by using an on-board radar to maintain a desired spacing from a preceding vehicle that has been detected in the same lane on the highway. The firstgeneration ACC systems are currently available in Japan and Europe a...

We calculate bounds on per-lane Automated Highway System (AHS) capacity as a function of vehicle capabilities and control system information structure. We assume that the AHS lane is dedicated for use by fully automated vehicles. Capacity is constrained by the minimum inter-vehicle separation necessary for safe operation. A methodology for deriving the safe minimum inter-vehicle separation for ...

Proponents of Int,elligent Vehicle/Highway System or IVHS see it as a new technology which will make a major change in highway transportation. Control, communication and computing technologies will be combined into an IVHS system that can significantly increase safety and highway capacity without new roads having to be built. This paper outlines key features of one highly aut,omated IVHS system...

Connected and automated vehicles (CAVs) are expected to transform future transportation systems. Over time, these might enhance traffic efficiency safety, especially at urban intersections. Therefore, it is essential make adaptations the analysis models that currently designed for human-driven only. This paper aims assess impact of CAVs on entry capacity roundabouts develop an approach adjust v...

This study aimed to investigate the relative performance of two models (negative binomial (NB) model and two-component finite mixture of negative binomial models (FMNB-2)) in terms of developing crash modification factors (CMFs). Crash data on rural multilane divided highways in California and Texas were modeled with the two models, and crash modification functions (CMFunctions) were derived. T...

This paper evaluates various options for addressing traffic problems on the Malahat highway corridor, north of Victoria, British Columbia. A combination of transit and vanpool service improvements, support strategies, and incremental roadway improvements is by far the most cost effective and beneficial option. Current planning tends to undervalue this approach by ignoring some costs of highway ...

T he 1985 Highway Capacity Manual (HCM) introduces new concepts of capacity and level of sarvice that are, in some cases, radically different from those used in previous editions of the HCM.’ A previous article has presented and discussed these basic concepts and their implication on interpreting capacity analysis results.’ This article focuses on the three primary examples of markedly differen...