Research on the ITSCP has grown much more important with increasing traffic congestion. Based on these theoretical foundations, various algorithms have since been proposed considering the rapid development of traffic infrastructure such as vehicular actuated systems and induction loop detectors this review focuses on these algorithms. Following their research, theoretical analyses have been conducted to derive equations for the traffic capacity and average delay per vehicle at a signalized intersection, and various microscopic traffic simulators have been developed to optimize traffic signal settings (e.g., VISSIM). A decade later, Robertson developed a software tool named TRANSYT that determined optimal fixed-time traffic signal settings and calculated the performance index of the signal network. In this paper, we review research on the intersection traffic signal control problem (ITSCP), which has been consistently studied for over 60 years since Webster first published guidelines for traffic signal settings. This review also highlights open issues and challenges that remain to be addressed by future research. A review across the entire body of knowledge throughout the history of the ITSCP is therefore provided. In this paper, a unified terminology for the ITSCP and a citation network of the current body of relevant research are accordingly presented, and various assumptions, constraints, and solution approaches are summarized. The objective of this review is to provide a survey of problems, methods, and practices in the evaluation of the ITSCP. Since the factors constituting the ITSCP exhibit stochastically complicated interactions, it is essential to identify these factors to propose solution methods that can address this complexity and still be practically implemented. The ITSCP seeks an efficient schedule for traffic signal settings at intersections with the goal of maximizing traffic flow while considering various factors such as real-time strategies, signal timing constraints, rapid developments in traffic systems, and practical implementation. We've also blogged about site performance.The intersection traffic signal control problem (ITSCP) has become even more important as traffic congestion has been more intractable. In Webmaster Tools, Labs > Site Performance shows the speed of your website as experienced by users around the world as in the chart below.WebPagetest shows a waterfall view of your pages' load performance plus an optimization checklist.YSlow, a free tool from Yahoo! that suggests ways to improve website speed. Page Speed, an open source Firefox/Firebug add-on that evaluates the performance of web pages and gives suggestions for improvement.If you are a site owner, webmaster or a web author, here are some free tools that you can use to evaluate the speed of your site: We use a variety of sources to determine the speed of a site relative to other sites. Like us, our users place a lot of value in speed - that's why we've decided to take site speed into account in our search rankings. But faster sites don't just improve user experience recent data shows that improving site speed also reduces operating costs. Faster sites create happy users and we've seen in our internal studies that when a site responds slowly, visitors spend less time there. Speeding up websites is important - not just to site owners, but to all Internet users. Site speed reflects how quickly a website responds to web requests. As part of that effort, today we're including a new signal in our search ranking algorithms: site speed. You may have heard that here at Google we're obsessed with speed, in our products and on the web.
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