News Every Day : "According to Lucas Davis, an energy researcher at UC Berkeley, such programs can lead to more air pollution. Such policies can be a big problem, so the authorities hope that the people can take public transport. However, those can be too slow and dangerous.
Hence, people just manage by buying two cars with different number plates. "I just think that once people become drivers in Mexico City they don't go back," Davis said.
Instead, these rules are mostly a costly inconvenience. "A rough calculation suggest these costs amount to over $300 million per year, or $130 per vehicle owner," according to Davis's research."