Families could be risking accidents - and subsequent car insurance claims - this Christmas by arguing while on the move, it has been suggested.According to research by the Environmental Transport Association (ETA), three in ten young drivers state they are just as likely to fight with loved ones while on the road as around the dinner table.In fact, some motorists aged 18 to 24 admit to specifically using car journeys to discuss family issues - with 20 per cent of those questioned revealing they had been involved in an argument which got so bad that a passenger demanded to be let out.However, ETA warned this could be a dangerous tactic.Director Andrew Davis said: "While family disagreements at Christmas might be as traditional as repeats on television and turkey sandwiches, rows on the road cab make driving inefficient, erratic or just plain dangerous."Meanwhile, ETA recently reported some buses are to be equipped with signs which flash if the vehicle behind is tailgating or speeding.