For those who need another way to find out real-time arrival info on your bus or train (in case Transit Tracker, auto-reply text message, TriMet's Mobile Site, and third party smart phone apps aren't enough options) TriMet's How We Roll blog reports that many of their bus stops offer another way for people to check real time availability on their smartphones.

Beginning last fall, TriMet began posting QR ("Quick Response") codes - those abstract black and white dot matrices that are popping up in print ads and posters - at is bus shelters.

By scanning the QR codes with your web-enabled smart phone, you can view schedules, an area map and real-time arrival information.

Aside from the smart phone with Internet service, one also needs to download QR software.