Living on the fringes of South London/Surrey there are, within a couple of miles of where I am, speed limits of 20, 30, 40, 50 ,60 & 70 along with a multitude of speed cameras. As much as I try to be aware of everything and stay within the law it's nice to have a helping hand in the form of a beep occasionally.
Bob.
PS Does the SatNav show the actual speed limit in force and give any sort of warning if that is exceeded?