When we talk about smart cities, one of the key pillars is a smart management of traffic and transport infrastructure. In this paper, we propose an architecture to support highway monitoring in smart cities. Starting from a project to reduce cost of maintenance tasks in highways, we develop a comprehensive architecture for effectively monitor and manage future highways. Highway’s security fence monitoring, environmental pollution, frozen asphalt warning, real-time accident detection, adapting speed limits to weather conditions, are examples of applications of our architecture.