Was that a pothole or a directional instruction?

I have to confess that I've never been able to understand how sat-navs ever got the OK.  When you think about it, there can be nothing more distracting for a driver than having to be constantly looking away from the road to a small screen set in the dashboard.  Yes, very useful, but also very dangerous I would submit.  So not surprising that people are looking for alternatives.  Perhaps the most obvious is a "heads-up" display such as is used in fighter  aircraft , but I imagine that expense is a big consideration there.  A firm in America has come up with the idea of a steering-wheel which vibrates in a clockwise direction to tell you to turn right, and anti-clockwise for left.  Not sure about that, but it's good that some thought is being given to the problem.