A dramatic standoff brought the 91 Freeway in Riverside to a grinding halt Friday morning after a crash involving a stolen Kia sparked a massive law enforcement response. Authorities sealed off every eastbound and westbound lane between 14th Street and Mission Inn Avenue while heavily armed officers surrounded the wrecked blue vehicle, according to the California Highway Patrol and Caltrans. The shutdown remained in effect for hours under a Sigalert before traffic finally resumed around noon. The subject remained inside the vehicle barricaded and ignored all commands and refused to cooperate with police to exit. ON SCENE TV The suspect drove onto the 91 freeway-14th street onramp and immediately struck another vehicle causing a traffic collision. ON SCENE TV Gridlocked drivers watched the tense scene unfold as tactical officers carrying rifles and K9 teams converged on the freeway. An armored vehicle was also brought in during the operation.…