BROOKLYN - Labor Day travel could mean bumper-to-bumper traffic this year, according to AAA. At least 91 percent of all travelers, or 31 million people, are expected to travel by car. That represents a 10 percent jump from last year. The increase is being attributed to improving economy, according to AAA. The agency is urging travelers to be cautious on the road and make sure to get to destinations safely. The U.S. Department of Transportation says about 70 people die in accidents caused by drunken driving in New York City each year. A nationwide campaign called "Drunk Driving. Over the Limit. Under arrest" runs through the Labor Day weekend.