Presently unstable acronym related to minimum vehicle sound levels. Commonly rendered as Audible Vehicle Alerting Systems, Approaching Vehicle Audible Systems; occasionally Approaching Vehicle Audible Signals

European Union, an REIO comprised of Belgium, France, Germany, Italy, Luxembourg, Netherlands, Denmark, Ireland, Greece, Portugal, Spain, Austria, Finland, Sweden, Cyprus, Czechia, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, Slovenia, Bulgaria, and Romania.