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You don't fix your vision anywhere, you scan, just like you would when piloting an aircraft. You don't need a TomTom or other similar device to be a safe driver; you just need to be focused on your task and be paying attention. If you aren't prepared to do that, you shouldn't be driving.
The only problem I have with speed cameras et al is that TPTB tend to see them as a means of reducing the budget for police patrols, and it's far more likely for people to get away with all kinds of horrifically bad driving nowadays. A perfect example happened on my way home yesterday; a couple of complete cunts racing each other, in busy traffic I might add. One veered across the road and nearly took me out, in order to go the wrong side of a traffic island.
Whenever something like this happens, I mourn for the days of police being allowed to beat people to a pulp in the cells, though not for long when I remember the innocents that have suffered so.
Agreed, you need to be scanning, but while you are doing that, you still cannot survey the entire scene around you at the same time, so you will miss the odd road sign as you are scanning another part of the road. Remember scanning on an open road, with no other traffic like buses, lorries etc or trees that could block signs, is one thing, in cities and towns, there are always plenty of things can and do cause you to miss certain things.
I for one, do not set out to deliberately speed, but I admit to accidentally speeding on the odd occasion, but then my TomTom kicks in and reminds me that I'm being a c**t, and I slow down, I will not accept that anyone here can honestly put their hand on their heart and swear that they are never guilty of speeding, they might claim that they don't but take from me, they are lying.
Your point about over reliance on cameras and the lack of traffic patrols is a very valid point and is one that I myself often make, another issue for me is very often traffic lights are badly sited. How often do you stop at lights, you are at the front and looking around you cannot see any lights aimed at you. This forces you to become a contortionist in order to see when they go green
Another thing I hate is when the TPTB decide to set a 20mph limit, maybe because there is a school etc, but they never bother to erect the large 20mph sign, often relying on it being painted on the road (FFS), this cannot be seen if covered by another vehicle and when it is uncovered, you could be scanning a side road junction etc and so miss it. Such a stupid sign also cannot be seen if covered by a dusting of snow, or is worn away, they also paint school on the road, this in my case is worn away and unreadable. The school is actually behind a row of houses so to a driver, the school is completely hidden from view. The only thing that tells you that its a 20mph zone is the very occasional small repeater sign. This road is over half a mile long, has a major cross road with lights about half way, has parking bays in one half of it.
Now imagine you were a stranger to the area, parked in a bay and went to the train station, bus station, theatre, or even went shopping. Came back to your car and drove off, looking around the street it looks like any other street in a city or town, so you assume 30mph, fair enough? There are no cameras currently on this road, but there is a major police station, so a police car clocks you driving at 30 in a 20mph zone, you're now guilty of driving at speed limit plus 50%, you are going to have the book thrown at you. This is why it is not possible to guess what the limit is just by looking around you, but a device like TomTom will tell you what the limit is, and if you assume its 30, when it is 20, it will sound an alarm to warn you, so it is a driving aid, aimed at improving safety, not a device to aid speeding.
Edit, spot the school, it behind the houses on the left and the entrance is just in front of the white car on the left. To a driver it has the appearance of a road junction