Infrastructure supporting vehicular network (V2X) capability is the key factor to the success of smart city because it enables many smart transportation services. In order to reduce the traffic congestion and improve the public transport efficiency, many intelligent transportation systems (ITS) need to be developed. In this paper, a smart traffic signal control (STSC) system is designed and implemented, it supports several smart city transportation applications including emergency vehicle signal preemption (EVSP), public transport signal priority (TSP), adaptive traffic signal control (ATSC), eco-driving supporting, and message broadcasting. The roadside unit (RSU) controller is the core of the proposed STSC system, where the system architecture, middleware, control algorithms, and peripheral modules are detailed discussed in this paper. It is compatible with existed traffic signal controller so that it can be fast and cost-effectively deployed. A new traffic signal scheme is specially designed for the EVSP scenario, it can inform all the drivers near the intersection regarding which direction the emergency vehicle (EV) is approaching, smoothing the traffic flow, and enhancing the safety. EVSP scenario and the related control algorithms are implemented in this work; integration test and field test are performed to demonstrate the STSC system.

中文翻译：

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智能城市应用智能交通信号控制系统的设计与实现。

支持车辆网络（V2X）功能的基础设施是智能城市成功的关键因素，因为它支持许多智能交通服务。为了减少交通拥堵并提高公共交通效率，需要开发许多智能交通系统（ITS）。本文设计并实现了一种智能交通信号控制（STSC）系统，它支持多种智能城市交通应用，包括紧急车辆信号抢占（EVSP），公共交通信号优先级（TSP），自适应交通信号控制（ATSC），生态驾驶支持和消息广播。路边单元（RSU）控制器是所提议的STSC系统的核心，本文详细讨论了系统架构，中间件，控制算法和外围模块。它与现有的交通信号控制器兼容，因此可以快速，经济地部署。一种新的交通信号灯方案是为EVSP场景专门设计的，它可以告知十字路口附近的所有驾驶员紧急车辆（EV）朝哪个方向行驶，从而使交通顺畅并提高安全性。这项工作实现了EVSP场景和相关的控制算法；进行集成测试和现场测试以演示STSC系统。并提高安全性。这项工作实现了EVSP场景和相关的控制算法；进行集成测试和现场测试以演示STSC系统。并提高安全性。这项工作实现了EVSP场景和相关的控制算法；进行集成测试和现场测试以演示STSC系统。