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Objectives: For more than one hundred years, street lighting has been one of the most ubiquitous capital investments in public safety. Prior research on street lighting is largely limited to ecological studies of very small geographic areas, creating substantial challenges with respect to both causal identification and statistical power. We address limitations of the prior literature by studying a natural experiment created by short-term disruptions to municipal street lighting. Methods: We leverage a natural experiment created by the differential timing of the repair of nearly 300,000 street light outages in Chicago. By conditioning on street segment fixed effects and focusing on a short window of time around the repair of a street light outage, we can credibly rule out confounding factors due to area-specific time trends as well as street segment-level correlates of crime. Results: We find that outdoor nighttime crimes change very little on street segments affected by street light outages, but that outages cause crime to spill over to nearby street segments. Effects are largest for robberies and motor vehicle theft. Conclusions: Despite strong environmental and social characteristics that tend to tie crime to place, we observe that street light outages are sufficiently salient to disrupt longstanding patterns. While the impact of localized street light outages can reverberate throughout a community, the findings imply that improvements in lighting can be defeated by the displacement of crime to adjacent spaces and therefore do not necessarily suggest that localized investments in municipal street lighting will yield a large public safety dividend. [ABSTRACT FROM AUTHOR]

This article investigates questions of 'designing for value change' via a ubiquitous, yet often takenfor- granted, technology -- streetlights. Smart city trends are spurring a new generation of streetlights, with lampposts being fitted with sensors, cameras and a host of other technologies aimed at monitoring and data collection. This has raised concerns about privacy, surveillance and power relations, arguably creating a changing value landscape for streetlights. However, the article will argue that, while smart streetlights may seem to instantiate a moment of value change, they in fact represent a continuity of values fundamental to the very foundations of public lighting. They embody a set of values -- and value tensions -- that can be traced back to the origins of modern public lighting in the seventeeth--eighteenth centuries. Moreover, urban nights occupy a liminal space at the boundaries of social order, which likewise informs streetlights' technical functions and symbolic meanings. Appreciating this continuity of values (and value tensions) is necessary for analysing the potential impacts of new innovations, as well as the value landscape that will inevitably shape their design and use. In adopting a historical perspective on a specific case study, as well as proposing the notion of value continuity, the article offers generalizable insights, as well as future research directions, for the theory and practice of designing for value change. [ABSTRACT FROM AUTHOR]

Lighting systems, as one of the biggest energy consumers on a global scale, are being upgraded based on innovative energy-saving (hereafter E-saving), energy-efficiency (E-efficiency), and energy-cost (E-cost) reduction schemes. According to research, among lighting systems, public lighting systems (PLSs) have significant potential for such energy projects. It can be realized through smart dimming, installing light-emitting diode (LED) luminaries, using renewable energy, etc. Accordingly, this work reviews the E-saving, E-efficiency, and E-cost reduction schemes for real-world PLSs by giving related techno-economic formulation. In this regard, smart control/dimming approaches via combined Internet of Things and wireless technologies, installing LED luminaires, optimal layout design, reactive power compensation, etc., are discussed by reporting the saving potentials, the payback period of the investment, and carbon reduction effects. Moreover, the use of renewable energy (including photovoltaic panels, wind turbines, pump- as -turbine systems, biomass plants, etc.) integrated with batteries to power PLSs is discussed by giving the E-cost reduction potential. Moreover, the pros/cons of previous works, the key findings of this review work, and recommendations for future works are outlined. This work shows future research directions, identifies high-potential energy projects for energy planners, and outlines the importance of renewable energy in making PLSs more environmentally friendly. Moreover, the role of energy policymakers' financial support in expediting the widespread enforcement of energy projects is outlined by studying the payback period of projects, which is about 5–7 years (on average 5.8 years, 6.9 years, 4.9 years, and 5.6 years for E-saving, E-efficiency, combined E-saving/E-efficiency, and E-cost reduction schemes, respectively). [Display omitted] • In-depth literature review of energy policies in real-world public lighting systems. • Current and critical solutions for energy saving and efficiency. • The role of renewable/battery systems in powering public lighting. • The importance of LED lighting and smart control in reducing carbon emissions. • Pros and cons of the previous works, and key findings of the study. [ABSTRACT FROM AUTHOR]

The purpose of this study is to implement the Message Queuing Telemetry Transport (MQTT) protocol and the Progressive Web App (PWA) of the Internet of Things (IoT) based public street lighting system. The MQTT (Message Queuing Telemetry Transport) protocol is a protocol that runs on the TCP / IP stack and is specially designed for machine to machine that does not have a special address. Progressive web application (PWA) is a software creation method by combining regular websites with mobile & desktop applications. This research is a development from previous research on Automatic Public Street Lighting. The development carried out includes a communication system, monitoring of lighting conditions, and automation or manual control of lights. The results obtained are the ease of monitoring lamp conditions and early detection of lamp problems. These results are obtained from the data sent by each street light, in the form of lamp status data, voltage, and electric current, through Long Range (LoRa) communication to the gateway using a radio network. The gateway data is then sent to the broker via the internet using the MQTT protocol and control and monitoring street light conditions using the Real-time Website and a mobile device. This research's impact is that street lighting monitoring and maintenance can be carried out more efficiently. [ABSTRACT FROM AUTHOR]

In the field of Smart Cities, especially for Smart Street Lighting and Smart Mobility, the use of low-cost devices is considered an advantageous solution due to their easy availability, cost reduction and, consequently, technological and methodological development. However, this type of transducers shows many critical issues, e.g., in metrological and reliability terms, which can significantly compromise their functionality and safety. Such issue has a large relevance when temperature and humidity are cause of a rapid aging of sensors. The aim of this work is to evaluate the effects of accelerated aging in extreme climatic conditions on the performance of a control system, based on a low-cost ultrasonic distance sensor, for public-lighting management in Smart Cities. The presented architecture allows for the detection of vehicles, pedestrians and small animals and contains a dedicated algorithm, developed in an Edge/Cloud environment, that is able to display the acquired measurements to users connected on the web. The obtained results highlight that the effect of accelerated aging is to significantly reduce the linearity of the calibration curve of the sensor and, moreover, to exponentially increase the number of outliers and invalid measurements. These limitations can be overcome by developing an appropriate self-calibration strategy. [ABSTRACT FROM AUTHOR]