The purpose of the hard shoulder is to give a person in an emergency situation a reasonably safe place to stop on the miles of motorway. If it’s used for relieving congested traffic where the devil are those motorists going to go.
It’s also a fact that when something catches someone by surprise it is often a natural reaction to panick and not remember to carry out the simplest seeming of tasks such as looking over one’s shoulder to check that the Hard Shoulder is clear when it should be.
I’m not saying that that would happen all the time but at high speeds and in emergency situations, panick and nowhere to go can have deadly consequences – it’s surprising just how those with high salaries and warm offices who job it is to think up these ideas, usually forget to actually think 🙂 🙂 🙂 LOL 😀