Drag the files from 'v_signs.rpf' folder right at (mods\x64f.rpf\levels\gta5\props\roadside\v_signs.rpf) or search 'v_signs.rpf' by pressing Ctrl + F3 in OpenIV.

(If you don't have it in the mods folder, you can make a copy of the files from base game data from the same location.)

Next, place "nooutletsigns.ymap" from 'Custom Maps' folder into (mods\update\x64\dlcpacks\custom_maps\dlc.rpf\x64\levels\gta5\_citye\maps\custom_maps.rpf)

If you don't have custom_maps you can get it at: https://www.gta5-mods.com/tools/mapeditor-2-ymap-converter


And That's all Folks!