 Perpetually two emergency doctor's cars ("NEF – Notarzteinsatzfahrzeug"), two NAWs ("Notarztwagen" – ambulances staffed with a physician in addition to regular personnel) and about 30 RTWs ("Rettungswagen" – regular ambulances) are on standby.Furthermore, several non-emergency ambulances ("KTW – Krankentransportwagen") and a Mobile Intensive Care Unit (MICU) are operated by the Red Cross to transport non-emergency patients to and between hospitals.In addition to the Red Cross, the Labourers'-Samaritan-Alliance (Arbeiter-Samariter-Bund Österreichs), the Austrian organisation of the Order of Malta Ambulance Corps (Malteser Hospitaldienst Austria) and the Green Cross ("Grünes Kreuz") operate ambulances ("KTW") for non-emergency patient transport.