Teams guess under new Chicago lights

JOLIET, Ill. - Although there will be floodlights all around the track, NASCAR teams still are very much in the dark going into the first Sprint Cup series night race at Chicagoland Speedway.

After seven years of racing at the 1.5-mile track on the outskirts of suburban Chicago during the daytime, the race was moved to tonight this season.

But NASCAR threw its teams a curveball by not scheduling any nighttime practice sessions at the track in the two days leading up to tonight's race. And Thursday night's qualifying session was rained out, meaning the first time many drivers will see the track under the lights will be when they take the green flag.

Add in NASCAR's new Car of Tomorrow, which is being used at Chicagoland for the first time after it appeared only in selected races last season, and Sprint Cup series champion Jimmie Johnson says teams are doing a 'large degree' of speculating on how to properly adjust their cars to make them handle properly.