Well, I don't know if that term is familiar to English-spoken people (this is just a direct Spanish translation), so let me tell you about it: Tomorrow, big works for a new massive transportation system called "Metrolínea" will start in my city. Due to that, the already congested ways won't be able to receive the regular traffic flow, so the mayor, along with the transit authorities, adopted this system to reduce the vehicular flow during the peak hours based on the last digit of cars' license plate (hence the name). At first, they told us that the cars which licenses' last digit are 1,2,3 and 4 won't be out on Mondays, 5,6,7 and 8 on Tuesdays, 9,0,1 and 2 on Wednesdays, 3,4,5 and 6 on Thursdays and 7,8,9 and 0 on Fridays. It was OK. I was prepared for leaving my car at home on Mondays and Thursdays (my license's last digit is 4). But suddenly they changed their minds and now the thing is like this: Cars which license plate's last digit is an even number can go out during the peak hours, but not during the rest of the day on even-numbered days. On odd-numbered days, even-numbered cars can't go out during peak hours, but can circulate during the rest of the day. That's difficult for me! It would be OK if I had one single working place, but I work at two universities and most of the times I have to move from one to another between 12:00 M. and 2:00 P.M. with no gaps in my schedule. Seems like a real hassle for me. And I'm picturing those vampires who work as transit agents training themselves to catch every car they can. For the first two weeks, the fine will be just "educational" but later it will be effective ($$$$). At the current exchange rate, it equals US $137. I agree that the city needs something like this due to the circumstances (and it will last three years at least), but again, the first method sounded better to me. The new one is a true annoyance.