There's a group of people pushing for the $400 charge to get a vehicle permit to be waived in an effort to promote road tourism in Nuevo Leon.. here's the link<http://monterrey.milenio.com/cdb/doc/noticias2011/64bc7397c0c9b2dbd7ee42d7da54c8fe>the news article for those of you who know spanish.
Nico