Top Guard Detectable Warnings for FDOT T3412 in Freeport (Walton County) December 12, 2015 emunoz Posted by emunoz on December 12, 2015March 7, 2018 Top Guard detectable warnings installed +/-580 sq.ft along SR20 in Freeport (Walton County) from White Point Rd to Roberts Dr. FDOT contract T3412. CW Roberts as prime.