Going off on a bit of a tangent here but this thread explains nicely why mobile phones and driving are generally a bad idea, but why some experienced drivers won't have any problem in using them.
I suppose the holy grail of all this is to get the entire process of vehicle control into a single autonomous chunk that you can send simple commands to like "avoid that falling rock" and it just happens.
That leaves you with plenty of room to look out for the hazards and maybe one or two spare for that ham sandwich or phone call
Of course cams are going to take up two chunks minimum, one is a monitoring process that keeps track of the current speed limit as the signs change and another monitoring the actual numerical speed.
However, as I said in the other thread, these work in a completely different mode to driving. They work in the logical mode rather than the intuitive mode, so I suppose the ultimate question is can these two work simultaneously (as in a CPU and a maths co-pro) or does it have to switch modes (as in between segmented addressing and 32bit addressing) with the associated data corruption that can occur if you get it wrong.
If they can work simultaneously, what is the bus overhead between them, are the two halves of the brain communicating across the 33mhz PCI bus or do we have HyperTransport?
Continuing the analogy to absurd lengths, I'd say that the brain's two halves are like an CPU+AMD760 northbridge (the logical part) and a VIA 686B southbridge (the intuitive part) communicating over PCI with the 686B able to interrupt the northbridge and CPU for as long as is necessary, controlling the resources directly via DMA. Putting cameras on the road is like installing a SoundBlaster Live 5.1 card in there, at which point it gobbles up huge amounts of PCI bus bandwidth[1] and causes data corruption if you're accessing your harddrive at the same time.
And if anyone actually follows that analogy and understands it completely I'll be amazed!
[1] admittedly a significant part of this well-known problem was caused by bad drivers *ba-dum-tsch*