Top Guard Detectable Warnings for FDOT T3595 Harrison Ave in Panama City (Bay County) January 16, 2017 Posted by on January 16, 2017March 14, 2018 Top Guard yellow detectable warnings installed +/-400 s.ft. along Harrison Ave from Airport Rd to E 19th St. in Panama City (Bay County). FDOT contract T3595. CW Roberts was prime. Roadway Concepts is first tier sub.