Last month Adwords added below certain announcements the geolocation of the advertiser when that indicated a region for these campaigns. Google has just added the Local PlusBox which allows additional information on these announcements such as a Google Maps, the address and the route to get there …
This appears as a link below the ad, once clicked, it displays a map, the address, a link to get directions and another to get an enlarged map.
To be displayed this way, the ad must be located and be in premium positions. This option will be available in the coming weeks for the United States, Canada, the United Kingdom and Germany.
Source : Inside Adwords