[dontcarethrow2]

It could be given an extra sense with LIDAR but that is 'a fool's errand' and not as profitable.

I should start carrying a stop sign in my pack, have some fun on the highway.

[alistairSH]

As a cyclist who frequently gets buzzed by cars, it's certainly interesting to ponder the possibilities.

[proactivesvcs]

A thought which had come to my mind while reading this thread. One of the UK's "lane closed" signs, perhaps? ;-)