Bendy buses usually have a sign on the back saying "This vehicle is 18m long".
Which is helpful, if you thought you were about to overtake an ordinary-length bus, but would be far more use on the dashboard for use when the double-length vehicle driver is about to pull in after starting to overtake you.
That said, according to the numbers the practical road safety impact of these things is as nothing compared to, say, left-turning HGVs. On which subject Boris seems much more reluctant to get involved
Which is helpful, if you thought you were about to overtake an ordinary-length bus, but would be far more use on the dashboard for use when the double-length vehicle driver is about to pull in after starting to overtake you.
That said, according to the numbers the practical road safety impact of these things is as nothing compared to, say, left-turning HGVs. On which subject Boris seems much more reluctant to get involved