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Towards a Sustainable City for Cyclists: Promoting Safety through a Mobile Sensing Application

机译：迈向骑自行车者的可持续城市：通过移动传感申请促进安全

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摘要

Riding a bicycle is a great manner to contribute to the preservation of our ecosystem. Cycling helps to reduce air pollution and traffic congestion, and so, it is one of the simplest ways to lower the environmental footprint of people. However, the cohabitation of cars and vulnerable road users, such as bikes, scooters, or pedestrians, is prone to cause accidents with serious consequences. In this context, technological solutions are sought that enable the generation of alerts to prevent these accidents, thereby promoting a safer city for these road users, and a cleaner environment. Alert systems based on smartphones can alleviate these situations since nearly all people carry such a device while traveling. In this work, we test the suitability of a smartphone based alert system, determining the most adequate communications architecture. Two protocols have been designed to send position and alert messages to/from a centralized server over 4G cellular networks. One of the protocols is implemented using a REST architecture on top of the HTTP protocol, and the other one is implemented over the UDP protocol. We show that the proposed alarm system is feasible regarding communication response time, and we conclude that the application should be implemented over the UDP protocol, as response times are about three times better than for the REST implementation. We tested the applications in real deployments, finding that drivers are warned of the presence of bicycles when closer than 150 m, having enough time to pay attention to the situation and drive more carefully to avoid a collision.
机译：骑自行车是有助于保护我们的生态系统的伟大方式。骑自行车有助于减少空气污染和交通拥堵，因此，它是降低人们环境足迹的最简单方法之一。然而，汽车和弱势道路用户的同居，如自行车，踏板车或行人，易于导致严重后果的事故。在这种情况下，寻求技术解决方案，使得能够产生警报来防止这些事故，从而为这些道路使用者提供更安全的城市，以及更清洁的环境。基于智能手机的警报系统可以缓解这些情况，因为几乎所有人都在旅行时携带这样的设备。在这项工作中，我们测试了基于智能手机的警报系统的适用性，确定了最足够的通信架构。已经设计了两种协议以通过4G蜂窝网络从集中式服务器发送位置和警报消息。其中一个协议使用HTTP协议的顶部的REST架构实现，而另一个协议通过UDP协议实现。我们表明，建议的警报系统对通信响应时间是可行的，我们得出结论，应用程序应通过UDP协议实现，因为响应时间比其余实现更好三倍。我们在实际部署中测试了应用程序，发现司机被警告在接近150米的情况下骑自行车的存在，有足够的时间要注意情况并更仔细地开车以避免碰撞。

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