Top Guard Truncated Domes for FDOT E1N20 in Venice (Sarasota County) June 24, 2015 emunoz Posted by emunoz on June 24, 2015June 6, 2017 Top Guard black detectable warnings installed 16 locations (+/-300 sq.ft.) along SR 776 for maintenance contract in Venice (Sarasota County). FDOT contract E1N20. Ajax as prime.