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Xiao, Q. (author), Calvert, R. (author), Yan, S.Q. (author), Adcock, T.A.A. (author), van den Bremer, T.S. (author)Floating objects will drift due to the action of surface gravity waves. This drift will depart from that of a perfect Lagrangian tracer due to both viscous effects (non-potential flow) and wave–body interaction (potential flow). We examine the drift of freely floating objects in regular (non-breaking) deep-water wave fields for object sizes that...journal article 2024
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Yao, X. (author), Du, Zhaocheng (author), Sun, Zhanbo (author), Calvert, S.C. (author), ji, Ang (author)Deep Reinforcement Learning (DRL) has made remarkable progress in autonomous vehicle decision-making and execution control to improve traffic performance. This paper introduces a DRL-based mechanism for cooperative lane changing in mixed traffic (CLCMT) for connected and automated vehicles (CAVs). The uncertainty of human-driven vehicles (HVs...journal article 2024
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Zhang, H. (author), Fu, Rui (author), Wang, Jianqiang (author), Calvert, S.C. (author), van Lint, J.W.C. (author)The in-vehicle communication provides promising opportunities to improve the road safety and traffic efficiency. Previous studies demonstrated that the professional drivers have better driving skills than the non-professional drivers who allocate more attention to secondary tasks. However, they may not be sensitive to the new in-vehicle...journal article 2024
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Yuan, Y. (author), Wang, X. (author), Calvert, S.C. (author), Happee, R. (author), Wang, M. (author)Current driver behaviour models (DBMs) are primarily designed for the general driver population under specific scenarios, such as car following or lane changing. Hence DBMs capturing individual behaviour under various scenarios are lacking. This paper presents a novel method to quantify individual perceived driving risk in the longitudinal...journal article 2023
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Calvert, S.C. (author), van den Burg, Bastiaan D. (author), Taale, Henk (author)Route guidance in traffic management aims to improve traffic network performance aligned with a system optimum. However, service providers commonly offer user optimum travel advice that can negatively impact centralized route guidance. This paper quantifies and demonstrates the impact of different policy strategies for a centralized route...conference paper 2023
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- Calvert, S.C. (author), Johnsen, Stig O. (author), George, A. (author) journal article 2023
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Calvert, S.C. (author)Automatische voertuigen bieden grote kansen op het gebied van toegankelijkheid, mobiliteit en verkeersveiligheid, als we de risico’s op tijd onder ogen zien, zegt Simeon Calvert, universitair hoofddocent smart and sustainable mobility and network management aan de TU Delft.journal article 2023
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Mortimer, William (author), Calvert, R. (author), Antonini, A. (author), Greaves, Deborah (author), Raby, Alison (author), van den Bremer, T.S. (author)Experiments are contaminated by second-order error waves at sub- and super-harmonic frequencies when first-order wave generation is used. Herein, we investigate by experiment the implications of second-order wave generation theory for dynamic wave force and run-up on a vertical wall in shallow to intermediate water depth (k<sub>0</sub>d=0.5−1...journal article 2023
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Nordhoff, S. (author), Lee, John D. (author), Calvert, S.C. (author), Berge, S.H. (author), Hagenzieker, Marjan (author), Happee, R. (author)Tesla's Full Self-Driving Beta (FSD) program introduces technology that extends the operational design domain of standard Autopilot from highways to urban roads. This research conducted 103 in-depth semi-structured interviews with users of Tesla's FSD Beta and standard Autopilot to evaluate the impact on user behavior and perception. It was...journal article 2023
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Li, G. (author), Jiao, Y. (author), Knoop, V.L. (author), Calvert, S.C. (author), van Lint, J.W.C. (author)Car-Following (CF), as a fundamental driving behaviour, has significant influences on the safety and efficiency of traffic flow. Investigating how human drivers react differently when following autonomous vs. human-driven vehicles (HV) is thus critical for mixed traffic flow. Research in this field can be expedited with trajectory datasets...conference paper 2023
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Eeltink, D. (author), Calvert, R. (author), Swagemakers, J.E. (author), Xiao, Qian (author), van den Bremer, T.S. (author)Correct prediction of particle transport by surface waves is crucial in many practical applications such as search and rescue or salvage operations and pollution tracking and clean-up efforts. Recent results by Deike et al. (J. Fluid Mech., vol. 829, 2017, pp. 364–391) and Pizzo et al. (J. Phys. Oceanogr., vol. 49, no. 4, 2019, pp. 983–992) have...journal article 2023
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Jiao, Y. (author), Calvert, S.C. (author), van Cranenburgh, S. (author), van Lint, J.W.C. (author)This study presents a new method to infer the average two-dimensional (2D) spacing between interacting vehicles in urban traffic from trajectory data. In this context, 2D spacing reflects the amount of road space consumed by pairs of interacting vehicles, and is related to 2D density at the macroscopic level. Due to complex interaction and...journal article 2023
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Mathiesen, Frederik Baymler (author), Romao, Licio (author), Calvert, S.C. (author), Abate, Alessandro (author), Laurenti, L. (author)This paper proposes a new framework to compute finite-horizon safety guarantees for discrete-time piece-wise affine systems with stochastic noise of unknown distributions. The approach is based on a novel approach to synthesise a stochastic barrier function (SBF) from noisy data and rely on the scenario optimization theory. In particular, we...conference paper 2023
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Mathiesen, Frederik Baymler (author), Calvert, S.C. (author), Laurenti, L. (author)Providing non-trivial certificates of safety for non-linear stochastic systems is an important open problem. One promising solution to address this problem is the use of barrier functions. Barrier functions are functions whose composition with the system forms a Martingale and enable the computation of the probability that the system stays...journal article 2023
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Mecacci, Giulio (author), Calvert, S.C. (author), Santoni De Sio, F. (author)The urban traffic environment is characterized by the presence of a highly differentiated pool of users, including vulnerable ones. This makes vehicle automation particularly difficult to implement, as a safe coordination among those users is hard to achieve in such an open scenario. Different strategies have been proposed to address these...journal article 2023
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Calvert, S.C. (author)Automatische voertuigen bieden grote kansen op het gebied<br/>van toegankelijkheid, mobiliteit en verkeersveiligheid, als we<br/>de risico’s op tijd onder ogen zien, zegt Simeon Calvert.journal article 2023
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Calvert, S.C. (author), van Arem, B. (author), Lappin, Jane (author)Traffic safety is arguably the most important traffic metric from a human perspective. Still, many millions of people are killed on roads every year. In this paper, the concept of Herd Immunity for Traffic Safety (HITS) is presented for the first time. This concept focuses on identifying and describing the increased level of safety that is...journal article 2022
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Santoni De Sio, F. (author), Mecacci, G. (author), Calvert, S.C. (author), Heikoop, D.D. (author), Hagenzieker, Marjan (author), van Arem, B. (author)The paper presents a framework to realise “meaningful human control” over Automated Driving Systems. The framework is based on an original synthesis of the results of the multidisciplinary research project “Meaningful Human Control over Automated Driving Systems” lead by a team of engineers, philosophers, and psychologists at Delft University of...journal article 2022
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Calvert, R. (author), McAllister, M. L. (author), Whittaker, C. (author), Raby, A. (author), Borthwick, A. G.L. (author), van den Bremer, T.S. (author)Periodic water waves generate Stokes drift as manifest from the orbits of Lagrangian particles not fully closing. Stokes drift can contribute to the transport of floating marine litter, including plastic. Previously, marine litter objects have been considered to be perfect Lagrangian tracers, travelling with the Stokes drift of the waves....journal article 2021
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Nguyen, T.T. (author), Calvert, S.C. (author), Vu, Hai L. (author), van Lint, J.W.C. (author)Highway bottlenecks are responsible for the majority of traffic congestion. Although the problem of bottleneck detection is not new, contemporary methods have not solved the problem thoroughly with regards to bottleneck locations, activation time, and related congestion tracking. These elements are essential for identifying and characterizing a...journal article 2021