Search results for "traffic"
showing 10 items of 598 documents
Behavioural strategy of common bottlenose dolphins (Tursiops truncatus) in response to different kinds of boats in the waters of Lampedusa Island (It…
2014
Monitoring habitat use of common bottlenose dolphins (Tursiops truncatus) and boat traffic using Passive Acoustic Monitoring devices in a marine prot…
2014
Trafficking and secretion patterns of Hsp60 in tumor cells.
2012
Calibration of Speed-Density Relationships for Freeways in Aimsun
2014
The first application of a calibration methodology which uses speed-density relationships in the microsimulation calibration process is described in this article. Traffic patterns were implemented developing speed-density relationships for empirical and simulated data. For empirical relationships reference was made to traffic data observed at A22 Freeway (Italy). Aimsun microscopic traffic simulator software was then used to obtain analogous relationships for a test freeway segment under uncongested traffic conditions. Thus on field conditions were reproduced varying some calibration parameters until a good matching between field and simulation was achieved. The closeness between empirical …
ROAD SAFETY PERFORMANCES FROM MICRO-SIMULATION CONSIDERING AUTONOMOUS VEHICLES OPERATIONS
2019
Introduction of Autonomous Vehicles in road traffic will remove the impact of the human factor from the driver’s decision-making process, and will transform the criteria for road network design, road infrastructure administration, traffic modeling and assessment tools for road safety management. The paper presents a microsimulation-based approach for safety performance evaluation of roundabouts where different percentages of Autonomous Vehicles are mixed with Conventional Vehicles. The simulated vehicle trajectories exported from VISSIM were used as a basis to estimate traffic conflicts through the Surrogate Safety Assessment Model (SSAM) for a sample of European roundabouts. In order to be…
A behavioural model to evaluate the delay on urban traffic flows and analysis of environmental implications
2014
This paper deals the problem of a road's capacity in presence of perturbations in the vehicular flow. In particular, among the different causes of delay, is here the presence of vehicles parked along the road in relation at their parking activity. Preliminarily is evaluated the delay, caused by each vehicle that leaves its parking position and enters in the traffic flow or by that who slows down the flow to enter in the parking, by introducing these effects in the equations of flow, it is possible to evaluate the modifications that the same curves of down flow suffer. Consequently, it is also possible to evaluate the increase of pollutant emissions.
EMISSIONI INQUINANTI PRODOTTE DAL TRAFFICO VEICOLARE: MODELLIZZAZIONE E INTERVENTI DI BEST PRACTICES PER MIGLIORARE LA QUALITA’ AMBIENTALE
L’inquinamento atmosferico continua a essere un’emergenza e uno dei maggiori fattori di rischio ambientale per la salute umana. L’impiego nel campo della ricerca, in quello della tecnologia dei mezzi di trasporto, la razionalizzazione del modal split nel contesto urbano, l’inasprimento della normativa nell’accettazione di veicoli vetusti o scarsamente soggetti a manutenzione hanno fatto si che le emissioni di molti inquinanti atmosferici siano diminuite in modo sostanziale negli ultimi anni, determinando una migliore qualità dell’aria ambiente. Nonostante questo, per la complessità del fenomeno inquinamento atmosferico che comporta l’ormai ben nota mancanza di relazione lineare tra emission…
Alcuni elementi riguardanti i modelli di simulazione del traffico
2014
PARKING PRICING FOR A SUSTAINABLE TRANSPORT SYSTEM
2014
The purpose of this study has been to develop a model to designing an efficient parking pricing policy. The aim is an intelligent control and management system of parking pricing integrated with a redefinition of the circulation scheme to define a limited traffic zone in the central business district of Palermo. The transport demand over the entire area of the town has been studied in order to design various parking pricing scenarios with the application of an additional cost on parking inside the selected area of the CBD. This area attracts most of the private vehicular traffic and it is characterized by university faculties, schools, hospitals, offices and commercial areas. The optimal ho…
TECNICHE QUANTITATIVE PER LA PROGETTAZIONE DELLA TARIFFAZIONE DELLA SOSTA IN AMBITO URBANO
Ad oggi numerose resistenze dibattono sull’adozione di schemi di pricing nei centri urbani dalla presunta iniquità, che renderebbero di fatto accessibili i centri urbani soltanto a coloro che possono permettersi di pagare la tariffa di accesso. Ma al contempo l’evoluzione di tecnologie innovative di rilevamento e di infomobilità consentono di ipotizzare un completo ribaltamento dei criteri di tassazione del traffico stradale, dove il carico fiscale potrebbe essere rimodulato in relazione agli effettivi comportamenti di ogni singolo utente. L’obiettivo è stato quello di controllare e limitare la mobilità all’interno di una determinata area urbana attraverso un nuovo modo di concepire le ZTL …