Will Tyre Pressure Monitoring Systems deliver the CO2 benefits expected of them?
A4: Specifications for tyre pressure monitoring systems to warn drivers of a gradual drop in pressure over a longer period of time, and of a sudden drop in pressure have not been finalised through the United Nations Economic Commission for Europe (UN-ECE). However, modelling suggests that worthwhile benefits can be obtained in minimizing any increase in fuel consumption attributable to the pressure loss in tyres. The size of the benefit depends on the “trigger level” – by how much must the pressure drop before the driver is alerted. Q5: Are the wet grip requirements realistic, and will they be extended from car tyres to commercial tyres? A5: Tyre design is a compromise between rolling resistance, noise, wet grip, and other attributes, and for this reason the UN-ECE developed a test method and set limit values for wet grip to ensure that all tyres meet a minimum safety requirement. The Commission believes the limit values contained in the UN-ECE Regulation are sufficiently robust to ens
