Look Before Opening is a new bicycle initiative that is hoping to reduce the incidents of ‘dooring’ ie a cyclist who gets hit by a person opening a car door without looking first.
 
Cars and bicycles need to co-exist and Look Before Opening aims to change the habits of drivers who simply forget to look before opening their doors. So they are providing free stickers to put on the inside of car doors to serve as a visual aid to look before opening. 
 
Grab your stickers now (Australia only) http://www.lookbeforeopening.com/get-some-now/ If you want more than 50 (maybe you own a taxi fleet or white van service??)  call them on +61 (03) 9005 0055 to organise stickers for you.