I want to know the answer to the following question:
How can cars get exempt from the restrictions?
All the background I'm provided with is that "There is an environmental program, called Hoy No Circula ("Today Does Not Run", or "One Day without a Car"), whereby vehicles that have not passed emissions testing are restricted from circulating on certain days according to the ending digit of their license plates; this in an attempt to cut down on pollution and traffic congestion.". Is that enough to answer the question?