Automated Vehicles’ Effects on Urban Traffic Flow Parameters

Gemma, Andrea; Cipriani, Ernesto; Carrese, Stefano; Mannini, Livia

doi:10.1007/978-3-031-23721-8_49

Cited by 3 publications

(6 citation statements)

References 11 publications

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“…On the supply side, the road graph is made of 42,969 nodes and 74,300 links representing about 7300 km of roads hierarchically divided as described in Table 1. Table 1 also reports the main parameters associated with the cost functions per link type calibrated in [8] to simulate the network performances when the traffic incorporates AVs. The parameters of Table 1 are those adopted in our applications.…”

Section: Resultsmentioning

confidence: 99%

“…[7] proposes an easy-to-use multiclass assignment for the simulation of the presence of AVs, for which a robust convergence is assured by the proposal of an adjusted-BPR function. Parameters of such a function have been calibrated by using a microsimulation approach in [8].…”

Section: Literature Reviewmentioning

confidence: 99%

“…Ref. [8] propose different values according to the link localization (e.g., city center or suburbs), the road hierarchy (main or side street) and the vehicle type allowed (e.g., AVs and/or CVs).…”

Section: Modellingmentioning

confidence: 99%

See 2 more Smart Citations

Investigating the Effects of Automated Vehicles on Large Urban Road Networks: Some Evidence from Rome

2023

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This paper explores the possibility of applying simulation models formalized in the macrosimulation approach to predict the effects from the presence of automated vehicles in our cities. It is based on the use of a robust equilibrium assignment model allowing us to obtain multiclass traffic flows, including automated vehicles (AVs) and conventional ones (CVs) on large real-sized road networks. This modelling framework has been successfully applied to the road network of the metropolitan area of Rome, allowing us to assess the effects of AVs in future traffic at increasing penetration rates and the effects of possible transport policies involving AVs.

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Section: Resultsmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Investigating the Effects of Automated Vehicles on Large Urban Road Networks: Some Evidence from Rome

2023

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“…Olia et al [25] analyzed their impacts on capacity. In [26] the authors analyzed mixed traffic flows, applying a microsimulation approach to estimate traffic flow parameters. In [27] a review of VSL and RM control models is presented; in addition, the authors summarized the best practices for mixed traffic flow control and provided new insights and future research perspectives.…”

Section: State Of Artmentioning

confidence: 99%

Integrated Variable Speed Limits and User Information Strategy

Cipriani,

Giannantoni,

Mannini

2023

Sustainability

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This paper deals with the study of variable speed limits (VSLs) for traffic control and their integration with user information strategies. As few studies have addressed the integrated VSL and user information strategy, we focus on comparing the adoption of the latter with the VSL alone strategy application and the no-control case, highlighting the benefits the integration brings. The integrated strategy is able to smooth the severity of congestion, shifting its occurrence in a section of the mainstream mostly suited to vehicle accumulation. An application on a real network is carried out. The traffic congestion conditions along the real highway are simulated by means of Dynameq simulation software and the METANET macroscopic model. The VSLs are applied in a control area aiming to evaluate the potential and the limitations of the strategy on a real network as well as the integration of variable speed limits and user information strategies. Two different cases of road congestion caused by the presence of on-ramps are studied. Results show that the integration of the two strategies leads to a redistribution of flows, achieving a reduction in the total travel time spent in the network and an increase in the traveled distances, i.e., reducing the overall network time despite the increase in assigned flows. However, an integrated strategy requires adequate transportation supply and mainly crossing demand.

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“…These changes in the main distributions help to represent platooning, in which some vehicles move in a line, at the same speed, with the same acceleration, and with the same spacing and headway, as if they were part of a train convoy. This situation is possible only if vehicles are well connected, and has benefits in terms of increase in capacity [37,38].…”

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confidence: 99%

Performances and Environmental Impacts of Connected and Autonomous Vehicles for Different Mixed-Traffic Scenarios

Gemma,

Onorato,

Carrese

2023

Sustainability

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As the transition towards connected and autonomous vehicles gradually happens, different phases with CAVs and human-driven vehicles sharing the same network will occur. This paper’s purpose is to increase the knowledge of these mixed situations, studying the impacts of an increasing number of CAVs within the vehicle fleet on road capacity, travel time savings and energy consumption, providing new insights into the debate that is still open. The methodology focused on a microsimulation-based approach on an urban motorway in the city of Rome. Some of the outcomes from simulations, run with the software PTV VissimTM 21, were used to analyse variations in general performances of the transportation system, whereas the remaining results were fed into the emission model COPERT for assessing the impacts of CAV penetration on the energy consumption of the fleet. Results show how, in congested cases, appreciable improvements can be recorded in terms of road capacity, mean speeds, and environmental impacts, while in lower-congested situations, any enhancement in traffic fluidification counteracts the environmental performances of the whole system.

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Automated Vehicles’ Effects on Urban Traffic Flow Parameters

Cited by 3 publications

References 11 publications

Investigating the Effects of Automated Vehicles on Large Urban Road Networks: Some Evidence from Rome

Investigating the Effects of Automated Vehicles on Large Urban Road Networks: Some Evidence from Rome

Integrated Variable Speed Limits and User Information Strategy

Performances and Environmental Impacts of Connected and Autonomous Vehicles for Different Mixed-Traffic Scenarios

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