NASCAR was forced to cut this past Sunday’s Chicago Street Race short due to rain and limited lighting in the downtown area. Knowing that completing the full 75 laps was highly unlikely, NASCAR implemented a running clock with a cutoff time of 8:20 p.m. CT. Elton Sawyer, NASCAR Senior Vice President of Competition, said on SiriusXM NASCAR Radio Tuesday that language was put into the rulebook this past offseason to decide on a pre-determined time to finish races at tracks that don’t have lights. “We put language in the rulebook in the offseason that gave us the ability for facilities like Chica…