We are moving to http://www.wikispeedia.org/speedlimit/geo4.php and geo4a.php
The reason is, the old ones don’t have metering.
Plus the new ones are more reliable.
4a has sleeps in it, so Google won’t get mad at us calling reverse-geocoding too fast in succession.
4 doesn’t have the sleeps, but it might fail once in a while if Google complains.
They all return the same thing, speed limit and copyright information.
This will occur this week sometime.