It's happening round here too, but specifically on the a43 there's a roundabout plunged into darkness between Brackley and the M40. Iirc it's one of the few on that section that has a raised centre island by a about 4 or 5 feet, you know that type with 45 degree bank lined with chevron patterned black and white bricks.
Mrs CG reported a major accident there on her way to meet her parents Friday night. Car hit the roundabout and launched over the road way into a ditch on the other side. The following day, in the opposite direction, we noticed a fairly massive impact on the the same centre island banking on the way home. Clearly two drivers have over shot the rounda about and launched off the 45 degree vertical ramp that is the centre island of the roundabout.
The southbound approach is uphill which flattens off slightly for the last 200 yards or so, so you can only partially see it on approach. It's a tight radius so you have to scrub a lot of speed to get round, and people straight line it's two lane width as it is.
The roundabout is now lit with flashing beacons so you can see the bloody thing at night!
Now, I don't know about you guys, but the answer to this problem seems quite obvious to me. It's a simple option, with infrastructure conveniently already in place, soundly based on very practical and safety conscious reasons.... Need I go on?