Subject: RE: Cities without cars.
Because the pollution here in Mexico City is so bad, cars are not allowed to circulate within the city for one day each week (from 5 or 6 o'clock in the morning, until 10:00 at night). This is a permanent thing. The day depends on the last number of your licence plate, e.g. if your licence plate ends with a 5, then maybe you're not allowed to circulate on Wednesdays (I'm not sure which day, though). Cars without licence plates (like ours - we have been waiting for one for over 2 months!) are not allowed to circulate on Fridays (not very good if you want to go away on Friday for a 3-day weekend!).

Laurie in Mexico City