and that is it - in 'strict' terms. We've had it a couple of years now, and it has brought down most who were doing 35-40 in a '30' - to under 30, with no strict enforcement of '20'. Of course - other areas may implement it differently.
They have had speed sensors in the roads on outskirts of towns recently (the twin rubber tube type) - so I guess they are looking at effectiveness of the limits and if they want to go further with enforcement.
I'm generally in 2nd gear on my XR and R1 in a 20-limit.