In this paper, we consider optimal resolution of air traffic (AT) conflicts. Aircraft are assumed to cruise within a given altitude layer and are modeled as a kinematic system with constant velocity and curvature bounds. Aircraft cannot get closer to each other than a predefined safety distance. For such system of multiple aircraft, we consider the problem of planning optimal paths among given ...

Crash modification factors (CMFs) for road safety treatments are usually obtained through observational models based on reported crashes. Observational Bayesian before-and-after methods have been applied to obtain more precise estimates of CMFs by accounting for the regression-to-the-mean bias inherent in naive methods. However, sufficient crash data reported over an extended period of time are...

The operations of freeway ramp metering and urban traffic network signal control are independent in most areas. Such situation may cause some conflict between traffic streams of the two subsystems, or, at least, their dynamic interactions have not been taken into account from an overall system viewpoint. Traffic performance can be improved if the controls of these two subnetworks are integrated...

A model is presented for assessing the effects of traffic safety measures, based on a breakdown of the process in underlying components of traffic safety (risk and consequence), and five (speed and conflict related) variables that influence these components, and are influenced by traffic safety measures. The relationships between measures, variables and components are modelled as coefficients. ...

The problem of air traffic congestion isn’t unique to developing countries like Unites States, Russia and China. How to accommodate an ever increasing flights is a global problem and a potentially dangerous one. The projections of aircrafts in the air have tremendously increased and is expected to lead to major accidents by 2015. The aircrafts have limitations of geography and limited reach of ...

This paper proposes a method for multiple-aircraft conflict avoidance. We assume that aircraft cruise at constant altitude with varying velocities and that conflicts are resolved in the horizontal plane using heading change, velocity change, or a combination thereof. We assume that each aircraft’s position, heading, and velocity are available to all aircraft involved in the conflict, we constra...

ations of the controllers. Recent trends in air traffic W e explore the use of distributed on-line motion planning algorithms for multiple mobile agents, in A i r Traflc Management Systems (ATMS). The work is motivated by current trends in ATMS to move towards decentralized air trafic management, in which the aircraft operate in “free flight” mode instead of following prespecijied “sky freeways...

The n aircraft conflict resolution problem is highly combinatorial and can be optimally solved using classical mathematical optimisation techniques only for small problems involving less than 5 aircraft. This article applies an Ant Colony Optimization (ACO) algorithm in order to solve large problems involving up to 30 aircraft. In order to limit the number of pheromone trails to update, a n air...

This paper presents an on-going research focused on providing artificial intelligence to a traffic light controller. RACE intends to use this intelligent traffic light in its small educative traffic safety village, in which students exercise practices using traffic signs (vertical and horizontal) and traffic lights. One intersection in this village is controlled by traffic lights and the Univer...

R ese:irch for this article was prompted by a serious accident that occurred aiter a tripped conflict monitor c:iused an intersection signal to flash yellow for main street traffic and flash red for cross street traffic, just as the Manual on Uniform Truffic Control Devices suggests is normal. A visit to the accident site made it clear that accidents were quite foreseeable at this location if t...