I don't think it's a question of savinbg a few euros, at least that certainly wasn't the reason we slept on a motorway aire. We were heading South for the good weather in September. We were keen to get to the South coast as quickly as possible and were reluctant to lose a few hours by having to find a site off he motorway. It definitely wasn't worth the time saving as we lost a day reporting the fact that we were robbed while we slept to the police. We lost a further five days waiting for replacement phone and money from the UK. So I agree with you Marie, it just isn't worth leeping on the aires, whatever the reason.