The United Nations Economic Commission for Europe (UN ECE) has published new requirements on tire pressure monitoring systems (TPMS), according to InterRegs, an online resource for global vehicle safety and emissions regulations. These new requirements are contained within the 02 series of amendments to ECE Regulation No. 64 and specify minimum performance requirements and test procedures for TPMS fitted to passenger cars, multipurpose passenger vehicles, and light trucks. The new ECE requirements state that the TPMS’s warning signal will come on when the in-service operating pressure in one or more of the vehicle’s tires has been reduced by 20%. Compliance with these new requirements becomes mandatory in November 2012 for new types of vehicles and in November 2014 for all new vehicles.