If you've set AP to start at the speed limit then it will follow it, if you have it set to current speed it will not.Yes I'm interested in this too. It is much needed as there are so many temporary limits on motorways these days!
One question I have around this is should the speed when using autopilot adjust when the speed limit changes? As my car recognises the new speed limit on normal roads but won't drop down the speed accordingly. For example if Im on autopilot doing 70mph in a 70 zone and then the speed limit changes to 50mph the car recognises it but the "Max" speed I have set still stays the same (e.g. 73 Mph). Is this expected or do I have a setting wrong somewhere as I would like it to slow down itself in those instances?