Add the following to the end of your sys.txt (backup the original first):
then you can use one of these catagories which is not commonly used for the (forbidden zone in historic centre in Italy), let us suppose you chose catagory 18 then it will be as foloows:
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activated_speech="Caution, forbidden historic zone ."
approach_beep_speech="forbidden historic zone ."
in this example the unit will alert you before 600 meter and repeat that every 300 meter, ofcource you can change the text of "activated_speech" and "approach _beep_speech" to whatever you like, as well as the alert distance.
after that you have to store each historic point and store it as speed breaker.
Note by MOD: sorry,but use the TAG CODE for short/format your post. Thanks for understanding