Jason Dodson is tired of responding to high-speed crashes on Sparta Highway at its intersection with Old Rock Island Road.Dodson has been trying for years to get a flashing caution light placed at that intersection, but his efforts have been fruitless. In the wake of Wednesday’s crash that claimed two more lives, Dodson is renewing his push.“How many people have to die there before something is done?” asked Dodson, the 7th District constable who serves the Rock Island area. “I can’t tell you how many wrecks I’ve worked at that very same intersection.