An army of road workers will convert some 1,000 signs directing traffic to the new airport in the three nights before it opens next month. The Highways Department will deploy about 300 workers to convert the signs on July 3, 4 and 5. Department chief engineer for New Territories West, Matthew Ho Ping-kuen, said about 95 per cent of the new signs had already been erected. Most of the work would simply involve the removal of covers from directions to Chek Lap Kok, and the covering up of Kai Tak directions. Mr Ho said at least one aspect of the project required little effort. 'About 200 signs in the New Territories, mostly along the Tolo Highway and Route Three, will not need changing as they are applicable to both airports,' he said. About 120 signs directing drivers to Kai Tak will be covered up from 8pm on July 4 to 6am the next day.