Observer wrote:
It's not that a speedo check (or mirror check) can't be done safely - it can. And can be done quite frequently. However, a normal driver (not just an advanced driver but any reasonably competent driver) will not perform a speed (or other instrument) check or mirror check at a time when safety requires his eyes to be on the road ahead. In my experience, this happens quite frequently. For example, if I am approaching a junction with a minor road and a car waiting to pull out, I will suspend mirro and speedo checks until I am sure I have correctly assessed the developing hazard. There are many other similar examples.
The problem is that the more widespread the threat of speed enforcement becomes (whether a visible camera or a proliferation of enforcement signs), the more likely it is that a speedo check, which rarely makes any direct contribution to safety, will be done at the wrong time for the wrong reason. That lost second or so of observation may (eventually, in a sufficiently large population of events, will) make the critical difference between crashing and not crashing, possibly between life and death.
Fair point - now I think about it, I do that too. I still maintain that if you know your vehicle and you know you're going at 40 (or 50 or 30) when you check the speedo,
if nothing changes (ie engine note on a manual car, wind noise or just the "feel" of the vehicle), you know you're still going at around the same speed. This is certainly accurate enough to cover you for 8mph over the limit, even if you don't have a musical ear!
Like I say, I do sympathise with Freddie because anyone can stray over the limit occasionally. I also take the point that there are times when it's inappropriate to check the speed. And that not every driver on the road is good enough to realise this. But I still don't think that maintaining a constant speed is as dangerous or as difficult as some of you seem to. How many on here have digital speedos, just out of interest?