Reuters: Beijing car owners, many apparently puzzled by no-driving days designated by the last digit of their license numbers, now face revised rules which threaten even greater confusion. The no-car days, introduced on Oct 11 to reduce gridlock and pollution, have apparently left so many drivers scratching their heads that one Beijing newspaper runs front-page notices each day to remind drivers which weekday they aren’t allowed to drive. But the rules are simple enough. If the last …