Why traffic jams make men mad

Ladies, have you ever been calmly sat in traffic wondering why your other half is sweating like a racehorse, swearing like a docker and impatiently stabbing the satnav like it held the antidote to the poison he just drank?

Yes? Well, have some sympathy for the poor little chap. According to the latest research your man's stress levels are likely to soar seven times higher than your own when faced with a traffic jam.