The years we are experiencing are often identified as those of the Age of Smart Technologies. Smart is now a very popular term, with the meaning of clever, intelligent, sharp, quick on the uptake. Its extensive meaning can be grasped if we consider it as an acronym for Self-Monitoring Analysis and Reporting Technology to indicate the essential features of the innovative technologies that characterize today's society in its daily life. Thus, the advent of the Smart Age, which is therefore the era of smart technologies, has heavily characterized and modified many aspects of today's society compared to the past. In this panorama, some arising questions regard transport infrastructure systems and, first of all, road transport. This research proposes a focus on one main issue: how roads fit into this smart revolution? Actually, the paper aims to offer an overview of the smart approach in road engineering by proposing a broad discussion about the current state of innovation in the smart roads field, i.e. the roads of the Smart Age. After defining the key functions of a smart road, the paper reviews some innovative technologies that make these items effective. These are studied in depth both with regard to motorway-type infrastructures and urban roads and intersections, with attention to the various technological aspects and to the benefits perceivable by management, users and the community. The paper, therefore, offers a bird's eye view of this extremely dynamic sector with innovative technologies for a new intelligent and connected mobility, and discusses some of their criticalities and strengths allowing for optimization and development of new transport functions and services, improving energy efficiency and promoting social, economic and environmental sustainability.

我们正在经历的这些年通常被认为是智能技术时代。Smart现在是一个很流行的名词，意思是聪明、聪明、敏锐、上手快。如果我们将其视为自我监控分析和报告技术的首字母缩写词，则可以理解其广泛的含义，以表明当今社会日常生活中创新技术的基本特征。因此，与过去相比，智能时代的到来，也就是智能技术时代，极大地改变了当今社会的许多方面。在这种情况下，一些出现的问题涉及交通基础设施系统，首先是道路交通。这项研究提出了一个主要问题：道路如何适应这场智能革命？实际上，本文旨在通过广泛讨论智能道路领域的创新现状，即智能时代的道路，概述道路工程中的智能方法。在定义了智能道路的关键功能后，本文回顾了一些使这些项目有效的创新技术。对高速公路类型的基础设施、城市道路和十字路口进行了深入研究，关注各种技术方面以及管理层、用户和社区可感知的利益。因此，本文通过创新技术为新的智能和互联移动提供了这个极具活力的行业的鸟瞰图，