Yeah 'cause teen's are rekless
The increased speed limit goes into effect AT the speed limit sign, not at any point before that. While you're not likely to get cited for accelerating at a reasonable point before you actually get to the sign, you're still bound by the prior speed limit until you actually reach that sign.
No, the two things are unrelated.
826 limit
45 miles/hour
the posted speed limit
When another speed limit sign is reached that changes the limit from the previously posted one.
The speed limit is exactly that - the speed limit. While a reasonable excess of speed might be overlooked when overtaking another vehicle, there is no guarantee. You can be pulled over and cited for speeding, still.
The posted speed limit is the max speed.
if the red car is exceding tha speed limit YES!!!
In the UK the speed limit comes into force as soon as you pass the speed limit sign. As such the distance is zero as you should have slowed down to the posted speed limit before passing the sign.
The humps do not affect the speed limit. The speed limit is determined by other rules and signs.
The speed limit is 55mph.