Hernández Jayo, UnaiIglesia Carril, Idoia de laPérez Gómez, Jagoba2026-02-272026-02-272015-07-29Hernandez-Jayo, U., De-La-Iglesia, I., & Perez, J. (2015). V-alert: description and validation of a vulnerable road user alert system in the framework of a smart city. Sensors (Switzerland), 15(8), 18480-18505. https://doi.org/10.3390/S1508184801424-822010.3390/S150818480https://hdl.handle.net/20.500.14454/5275V-Alert is a cooperative application to be deployed in the frame of Smart Cities with the aim of reducing the probability of accidents involving Vulnerable Road Users (VRU) and vehicles. The architecture of V-Alert combines short- and long-range communication technologies in order to provide more time to the drivers and VRU to take the appropriate maneuver and avoid a possible collision. The information generated by mobile sensors (vehicles and cyclists) is sent over this heterogeneous communication architecture and processed in a central server, the Drivers Cloud, which is in charge of generating the messages that are shown on the drivers’ and cyclists’ Human Machine Interface (HMI). First of all, V-Alert has been tested in a simulated scenario to check the communications architecture in a complex scenario and, once it was validated, all the elements of V-Alert have been moved to a real scenario to check the application reliability. All the results are shown along the length of this paper.eng© 2015 by the authors; licensee MDPI, Basel, SwitzerlandSmart citiesVehicular networksVulnerable road usersjournal article2026-02-27