Obviously cost will be a factor, but it could be handy if it's reasonably prices. My number one hazard on my daily commute is cars forgetting I'm there and turning right while I'm overlapped.

It's frustrating because usually they'll have just passed me seconds ago, and either misjudged my speed, or simply didn't care. I usually end up shouting "don't turn right" as we come to the corner, but that gets tiring.

A few weeks ago the pass-and-turn right stunt was pulled by a police car, and as I turned with him, we had a minor collision. No damage except for a scratch on his passenger side door. I was pleasantly surprised when he stopped, asked if I was OK and apologized (first time anyone ever did).