From Longman Dictionary of Contemporary Englishtraffic islandˈtraffic ˌisland noun [countable] TTRa raised area in the middle of a road where people can wait until it is safe to cross
Examples from the Corpus
traffic island• The tramway station is now effectively a traffic island, surrounded by a one-way system and linked by pedestrian crossings. 3.• This viewpoint today would come from the middle of a traffic island.• No one ever walks round a traffic island.• Somehow his Volkswagen had climbed up on to a traffic island.• At second traffic island following sign to Beaumaris.• I guided him to the traffic island in the middle. 