摘要：a.erting drivers a.out incoming emergency vehicles a.d their routes ca. grea.ly improve their tra.el time in congested cities, while reducing the risk of a.cidents due to distra.tions. This pa.er contributes to this goa. by proposing Messia., a. a.droid a.plica.ion ca.a.le of informing regula. vehicles a.out incoming emergency vehicles like a.bula.ces, police ca.s a.d fire briga.es. This is ma.e possible by crea.ing a.network of vehicles ca.a.le of directly communica.ing between them. The user ca., therefore, ta.e driving decisions in a.timely ma.ner by considering incoming a.erts. Using the support of our GRCBox ha.dwa.e, the a.plica.ion ca. rely on vehicula. a.-hoc network communica.ions in the 5 GHz ba.d, being V2V （vehicle-to-vehicle） communica.ion provided through a.combina.ion of a.droid-ba.ed sma.tphone a.d our GRCBox device. The a.plica.ion wa. tested in three different scena.ios with different levels of obstruction, showing tha. it is ca.a.le of providing a.erts up to 300 meters, a.d notifying vehicles within less tha. one second.