On the frequency of road suffixes:
We may not need to have official abbreviations for every conceivable road suffix. The current list contains about 170 abbreviations. Based on SA road names, the 10 suffixes Road, Street, Avenue, Highway, Drive, Terrace, Track, Court, Lane and Crescent cover 95.3% of all segments. Adding another 10 (Way, Place, Parade, Grove, Circuit, Close, Boulevard, Freeway, Walk and Expressway) brings the total to 99.2%. If we provided a rule saying "suffixes not appearing in the table should be spelled out in full", we could cut the table down from 170 entries to 18. ("Walk" and "Lane" don't have abbreviations.) If editors followed that rule, we would cut down the incidents of people making up non-standard abbreviations but still get 99% of the benefit of shortened names