Between late 2011 and early 2012, I was working on an Android app that gives suggestions to travelers who enter US through ground border, from both Mexico and Canada. We gather wait time data from US border official website and present them to users in a mobile friendly way. The app also allows user to upload their wait times. Historical data is presented to users in nice graphs and charts.

The app is available in Android, iOS and web.
Media coverage:
LA Times: http://articles.latimes.com/2013/mar/26/local/la-me-abcarian-border-20130327
UC San Diego News: http://ucsdnews.ucsd.edu/pressrelease/new_service_helps_travelers_brave_long_wait_times_at_u.s._border_crossings