HONG Kong's biggest television screen - which costs a massive $50 million - will only show still slides when it is finally turned on. This is because the Government does not want to see motorists losing concentration driving past moving pictures beamed on to the street. Bosses at the new Times Square complex in Causeway Bay claimed they knew the score when splashing out on the huge 7 x 10-metre screen. Wharf Properties project director Fred Wai said the landmark on the front of the building would show images at 10-second intervals. ''The Government was afraid people would watch the screen and crash their cars,'' he said. ''We knew that before we picked the system. ''People would be unable to read what was on if the picture was moving. Still pictures give people time to read the whole thing and get the message. ''But it is the best of what is available and we think it is a good investment.'' Mr Wai said the screen would show slides of what people could expect when they go into $2.4 billion shopping centre, which opens in the autumn. Times Square claims to have the best fibre optic communications system in Hong Kong. It is hoped permission would be granted to show moving images on the screen for special events. One could be at New Year when the developers are planning to copy Times Square in the US with celebrations in the square. ''We don't want everyone to come here but it would be nice to have an event similar to the one in New York,'' Mr Wai said. ''We will have to talk to the police and all the other appropriate authorities.''