FILE - In this Oct. 15, 2015, file photo, vehicles pass a highway construction site near Sacramento, Calif. A former California Department of Transportation contract manager has pleaded guilty in what federal prosecutors say is an ongoing investigation in to a bid rigging and bribery scam. Choon Foo "Keith" Yong agreed Monday, April 11, 2022, to cooperate with an investigation into what prosecutors say was a conspiracy to rig the competitive bidding process for improvements and repair contracts. (AP Photo/Rich Pedroncelli, File)