Motorists driving around Ohio don’t have too much to worry about, except for two key areas. A new American Highway Users Alliance study catalogs the nation’s worst traffic bottlenecks and areas of traffic congestion. The Buckeye State avoided any including on its list of the 50 worst bottleneck spots in the country. However, the state did get mentioned for other zones of high congestion. Here are Ohio’s two worst areas for traffic congestion: Columbus (I-670 between N.