Improving performance of pedestrian positioning by using vehicular communication signals

Pedestrian-to-vehicle communications, where pedestrian devices transmit their position information to nearby vehicles to indicate their presence, help to reduce pedestrian accidents. Satellite-based systems are widely used for pedestrian positioning, but have much degraded performance in urban canyon, where satellite signals are often obstructed by roadside buildings. In this paper, we propose a pedestrian positioning method, which leverages vehicular communication signals and uses vehicles as anchors. The performance of pedestrian positioning is improved from three aspects: (i) Channel state information instead of RSSI is used to estimate pedestrian-vehicle distance with higher precision. (ii) Only signals with line-of-sight path are used, and the property of distance error is considered. (iii) Fast mobility of vehicles is used to get diverse measurements, and Kalman filter is applied to smooth positioning results. Extensive evaluations, via trace-based simulation, confirm that (i) Fixing rate of positions can be much improved. (ii) Horizontal positioning error can be greatly reduced, nearly by one order compared with off-the-shelf receivers, by almost half compared with RSSI-based method, and can be reduced further to about 80cm when vehicle transmission period is 100ms and Kalman filter is applied. Generally, positioning performance increases with the number of available vehicles and their transmission frequency

Synergizing Roadway Infrastructure Investment with Digital Infrastructure for Infrastructure-Based Connected Vehicle Applications: Review of Current Status and Future Directions

The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.The safety, mobility, environmental and economic benefits of Connected and Autonomous Vehicles (CAVs) are potentially dramatic. However, realization of these benefits largely hinges on the timely upgrading of the existing transportation system. CAVs must be enabled to send and receive data to and from other vehicles and drivers (V2V communication) and to and from infrastructure (V2I communication). Further, infrastructure and the transportation agencies that manage it must be able to collect, process, distribute and archive these data quickly, reliably, and securely. This paper focuses on current digital roadway infrastructure initiatives and highlights the importance of including digital infrastructure investment alongside more traditional infrastructure investment to keep up with the auto industry's push towards this real time communication and data processing capability. Agencies responsible for transportation infrastructure construction and management must collaborate, establishing national and international platforms to guide the planning, deployment and management of digital infrastructure in their jurisdictions. This will help create standardized interoperable national and international systems so that CAV technology is not deployed in a haphazard and uncoordinated manner

Transit Stations: Sub-centers in Rotterdam Zuid

The City of Innovations Project ‘Walk-IN Stations’ is organized around speculating and projecting on future scenarios for the South of Rotterdam. Students are invited to reflect on the importance of transport networks within and extending from the city. In considering the way these networks have shaped the city through weaving the urbanities of the city center(s) and suburban areas and how they will further shape the future urban territories, this elective positions itself as a negotiation between architecture, network infrastructure, public realm, policy & governance and the territory. Stations are architectural objects which connect an area to the city’s territorial plane and have the potential to generate new urban dynamics. In the compact city the station no longer is simply the space to access mobility networks, in this informed by their dry pragmatism, but becomes an urban place of sociality and encounter - an extended public space beyond mobility itself. Furthermore, the Dutch Ministry of Infrastructure and Water Management has developed a vision on the future of Public Transport (towards 2040)1 based on new mobilities and Door-to-Door solutions. The vision was followed by the “Handelingsperspectief”, intended as an instrument to jointly map the current and future needs of PT nodes and their surroundings2. The stations of the future become hubs3, where you can transfer from one mode of transport to another. Hubs are also destinations in themselves, places to meet up, to work, to exercise, to eat. How are new mobility solutions integrated in the current system and take shape at public transport nodes, in the context of low car inner-cities (Autoluw) like in Rotterdam? Which relationships and cross-fertilizations can be significant for the design of the future urban stations in Rotterdam? How should these stations be developed in order to act as public places for collective action? How could one create an optimal mobility chain by decreasing transition friction, increasing quality of the space at station locations? This elective will attempt to answer those questions through research-by-design process, conducted by the students and tutors of Complex Projects in close collaboration with the City of Rotterdam, and enjoys the contribution of the University of Gustave Eiffel, Delta Metropool Association, De Zwarte Hond and PosadMaxwan experts on station developments. The elective course City of Innovations is scheduled in Q3, between MSc1 design studio and MSc2 research and design studio. It attracts students from different tracks, from architecture and landscape architecture to urban planning, urbanism and management. City of Innovations guides research-by-design projects focusing on mobility and public space challenges. Teachers and students work together exploring the increasingly complex world that demands increasingly complex projects, in design and also in the way of designing. The studio is organized with the method of charrette (period of intense design activity and short-term design project, usually developed in teams), focusing on 3 stations with different characters in Rotterdam Zuid. Research is done per station, in groups of 12 students; followed by a “stakeholder workshop”, students conclude the research result into spatial criteria and quality requirements. Departing from different priorities, the students split into smaller groups to develop different approaches for a more sustainable and inclusive station developed within the implementation of the new mobility method

Human Motion Trajectory Prediction: A Survey

With growing numbers of intelligent autonomous systems in human environments, the ability of such systems to perceive, understand and anticipate human behavior becomes increasingly important. Specifically, predicting future positions of dynamic agents and planning considering such predictions are key tasks for self-driving vehicles, service robots and advanced surveillance systems. This paper provides a survey of human motion trajectory prediction. We review, analyze and structure a large selection of work from different communities and propose a taxonomy that categorizes existing methods based on the motion modeling approach and level of contextual information used. We provide an overview of the existing datasets and performance metrics. We discuss limitations of the state of the art and outline directions for further research.Comment: Submitted to the International Journal of Robotics Research (IJRR), 37 page

“Smashing Into Crowds” -- An Analysis of Vehicle Ramming Attacks

Vehicle ramming attacks are not new. But since 2010 Jihadists have urged their use. Is this the wave of the future, or a terrorist fad? To answer this and other questions the authors expanded and updated the database used in their May 2018 MTI Security Perspective entitled An Analysis of Vehicle Ramming as a Terrorist Threat to include 184 attacks since January 1, 1970. They also reviewed literature and examined some cases in detail. This MTI Security perspective indicates that while not new, vehicle rammings are more frequent and lethal since 2014, although the number of attacks seems to be dropping in 2019. Still it is too early to know if this is because of government countermeasures or because it is a fad that has come and gone. They also found that: (a) the majority of attacks occur in developed countries like the US and Europe; (b) though not more lethal than some other tactics they can be easily carried out by those who cannot get bombs or guns in a target-rich environment that is difficult to protect; (c) while Jihadists (responsible for only 19% of the attacks) have exhorted their use since 2010, it isn’t clear these calls have been successful -- instead the pattern of attacks suggest a kind of wider contagion; (d) attackers plowing vehicles into public gatherings and pedestrianized streets are the most lethal, particularly the attacks are planned and the drivers rent or steal large trucks or vans driven at speed; and finally, (e) government authorities cannot prevent these attacks but can and are doing things to prevent them and mitigate fatalities when they occur

Walking spaces:Changing pedestrian practices in Britain since c. 1850

Walking is one of the most sustainable and healthy forms of everyday travel over short distances, but pedestrianism has declined substantially in almost all countries over the past century. This paper uses a combination of personal testimonies and government reports to examine how the spaces through which people travel have changed over time, to chart the impacts that such changes have had on pedestrian mobility, and to consider the shifts that are necessary to revitalise walking as a common form of everyday travel. In the nineteenth century, most urban spaces were not especially conducive to walking, but many people did walk as they had little alternative and the sheer number of pedestrians meant that they could dominate urban space. In the twentieth century successive planning decisions have reshaped cities making walking appear both harder and riskier. Motorised transport has been normalised and pedestrianism marginalised. Only radical change will reverse this