Effective　information　dissemination　constitutes　the　cornerstone　of　communication　in　Vehicular　Ad　hoc　Networks　(VANETs).　Avoiding　broadcast　storm　is　one　of　the　considerable　challenges　in　the　development　of　an　effective　dissemination　scheme　for　VANETs,　which　leads　to　extensive　rebroadcasting.　Reliable　emergency　messages　delivery　is　another　substantial　measure　of　performance,　especially　in　dense　traffic　and　high　mobility　scenarios.　A　generic　solution　to　deal　with　these　problems　is　to　cluster　vehicles,　so　that　emergency　messages　can　be　re-broadcasted　to　adjacent　clusters　only　by　a　smaller　number　of　vehicles.　Thus,　reliable　selections　of　cluster　head　and　relay　nodes　are　important　to　reduce　the　number　of　retransmissions.　In　this　regard,　we　propose　a　clustering　technique　for　Reduced　Broadcast　Overhead　Scheme　for　Emergency　Message　Dissemination　(RBO-EM).　RBO-EM　is　based　on　the　mobility　metrics　to　strengthen　the　cluster　formation,　avoid　communication　overhead　and　maintain　the　message　reliability　in　a　high　mobility　scenario.　Moreover,　we　introduce　relay　nodes　based　on　estimated　link　stability　to　limit　the　number　of　retransmissions.　RBO-EM　is　evaluated　against　eminent　schemes　by　varying　traffic　densities　and　speed.　Simulation　results　indicate　that　RBO-EM　enables　a　reasonable　performance　gain　in　terms　of　coverage,　end-to-end　delay　and　message　reliability.