Top Guard Truncated Domes for FDOT T1623 in Bartow (Polk County) May 11, 2016 Posted by on May 11, 2016June 20, 2017 Top Guard yellow detectable warnings installed +/-88 locations (+/-1335 sq.ft.) along US 17 in Bartow (Polk County). FDOT contract T1623. Preferred Materials as prime. Florida Safety Contractors as sub.