When tyres are under-inflated, excessive heat builds up within the tyre and makes it much more susceptible to suffering from a rapid deflation. This can make the vehicle difficult to control, especially as these incidents occur most frequently after prolonged periods of high speeds. ‘MAKE SURE YOUR TYRES ARE IN GOOD CONDITION’Figures from the Royal Automobile Club (RAC) show that in 2012 its patrol crews attended to more than 50 000 tyre related call-outs in July and August. Under-inflated tyres pose a safety issue due to an increased risk of tyre failures and punctures.RAC spokesman Simon Williams said: “In 2012 RAC patrols attended 344 000 call-outs for tyre and wheel jobs, making it our second biggest breakdown with 15% of our 2.3 million breakdowns. “We urge everyone taking to the roads to make sure their tyres are in good condition otherwise they risk spending some unwanted time on the hard-shoulder or in a lay-by instead of on the beach.”Under-inflation can also prove costly due to increased fuel consumption as the engine has to work harder to turn the tyres.RAC says: “When checking your tyre pressures, drivers should ensure tyres are correctly inflated for the load being carried, such as additional passengers or holiday luggage."