P.M. Rush Hour More Dangerous Than A.M.

According to 'Traffic: Why We Drive The Way We Do (And What It Says About Us', by Tom Vanderbilt (Alfred A. Knopf, $24.95), the morning rush hour is twice as safe as the evening rush hour, in terms of traffic accidents. That's because, when you're driving home in the evening, drivers are out shopping, picking up kids, etc. and not concentrating on driving as much as they should be. They are also more likely to have had a drink or two on the way home from the office.

So remember that on your drive home tomorrow and be especially observant.