http://www.ratpcodes2d.fr/exemples-de-codes-2d/
RATP Codes 2D
A trial of a system of barcodes printed on advertisements throughout the RATP transit system. During the project, travelers with mobile phones could use free software to photograph the bar code, translate it to a Web link, and retrieve further information about the service they sought.
This service is planned for a future production release in Paris' bus stops.
