Top Guard Truncated Domes for FDOT T6341 in North Miami (Miami-Dade County) November 4, 2015 emunoz Posted by emunoz on November 4, 2015June 6, 2017 Top Guard yellow detectable warnings installed +/-60 locations (+/-705 sq.ft.) along Biscayne Blvd from NE 122nd Ave to NE 151st Ave in North Miami (Miami-Dade County). FDOT contract T6341. General Asphalt as prime. Horizon Contracting as sub.