5,131 research outputs found
Stable Infrastructure-based Routing for Intelligent Transportation Systems
Intelligent Transportation Systems (ITSs) have been instrumental
in reshaping transportation towards safer roads, seamless
logistics, and digital business-oriented services under the umbrella of
smart city platforms. Undoubtedly, ITS applications will demand
stable routing protocols that not only focus on Inter-Vehicle Communications
but also on providing a fast, reliable and secure interface to
the infrastructure. In this paper, we propose a novel stable infrastructure-
based routing protocol for urban VANETs. It enables vehicles
proactively to maintain fresh routes towards Road-Side Units
(RSUs) while reactively discovering routes to nearby vehicles. It
builds routes from highly stable connected intersections using a selection
policy which uses a new intersection stability metric. Simulation
experiments performed with accurate mobility and propagation
models have confirmed the efficiency of the new protocol and its
adaptability to continuously changing network status in the urban
environment
CBPRS: A City Based Parking and Routing System
Navigational systems assist drivers in finding a route between two locations that is time optimal in theory but seldom in practice due to delaying circumstances the system is unaware of, such as traffic jams. Upon arrival at the destination the service of the system ends and the driver is forced to locate a parking place without further assistance. We propose a City Based Parking Routing System (CBPRS) that monitors and reserves parking places for CBPRS participants within a city. The CBPRS guides vehicles using an ant based distributed hierarchical routing algorithm to their reserved parking place. Through means of experiments in a simulation environment we found that reductions of travel times for participants were significant in comparison to a situation where vehicles relied on static routing information generated by the well known Dijkstra’s algorithm. Furthermore, we found that the CBPRS was able to increase city wide traffic flows and decrease the number and duration of traffic jams throughout the city once the number of participants increased.information systems;computer simulation;dynamic routing
EMVLight: a Multi-agent Reinforcement Learning Framework for an Emergency Vehicle Decentralized Routing and Traffic Signal Control System
Emergency vehicles (EMVs) play a crucial role in responding to time-critical
calls such as medical emergencies and fire outbreaks in urban areas. Existing
methods for EMV dispatch typically optimize routes based on historical
traffic-flow data and design traffic signal pre-emption accordingly; however,
we still lack a systematic methodology to address the coupling between EMV
routing and traffic signal control. In this paper, we propose EMVLight, a
decentralized reinforcement learning (RL) framework for joint dynamic EMV
routing and traffic signal pre-emption. We adopt the multi-agent advantage
actor-critic method with policy sharing and spatial discounted factor. This
framework addresses the coupling between EMV navigation and traffic signal
control via an innovative design of multi-class RL agents and a novel
pressure-based reward function. The proposed methodology enables EMVLight to
learn network-level cooperative traffic signal phasing strategies that not only
reduce EMV travel time but also shortens the travel time of non-EMVs.
Simulation-based experiments indicate that EMVLight enables up to a
reduction in EMV travel time as well as an shorter average travel time
compared with existing approaches.Comment: 19 figures, 10 tables. Manuscript extended on previous work
arXiv:2109.05429, arXiv:2111.0027
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