By Martin Fricker Road manners and potholes are the worst they have ever been, according to a 100-year-old man who has been driving for 87 years. Eric Dixon still proudly motors around in his Kia Picanto – and has no intention of stopping despite the declining manners of drivers. He got his first job behind the wheel of a three-tonne lorry after leaving school aged just 13. Since then Eric, from Canterbury, Kent, has driven every vehicle – from motorcycles to double-decker buses. Asked how the roads have changed over the decades, the centenarian they are worse than ever. He said: “There was al…