Traffic cameras are clearly a revenue stream and not a safety enforcement tool. The presence of the cameras may be a deterrent to some motorists (assuming clear notice is given in advance of the cameras locations), but on the whole, do little to stop those that continue to speed knowing the cameras are present.
What effect does a ticket that arrives in the mail a week later do to stop the original infraction - nothing. Now a state trooper or local police vehicle at the side of the road has 2 effects - one the traffic seeing the speed trap slows down, and second the speeding vehicles are pulled over, which instantly stops the "danger" they are causing.
Assuming that safety is their motivation, would the town and iTraffic be happy if this was 100% successful - that is to say that the deterrent effect of the presence of the cameras stopped all motorists from speeding and therefor no tickets were issued and no income generated? I think not.