We all know that marriages and relationships have their high and low points, their ups and downs, their speed bumps. And each partnership will be able to recognise when the speed bumps are ahead and will have its own strategies for getting through the tough times. But how do you know when a marriage or relationship is really over? How do you know when the speed bumps are just too large to negotiate, too frequent and that it is time to take over the controls and change lanes?