safety concerns were raised among the public after several accidents on the system during the 1980s and 1990s, but most problems have been fixed. on 5 august 1993, two trains collided at clementi mrt station because of an oil spillage on the track, which resulted in 132 injuries. there were calls for platform screen doors to be installed at above-ground stations after several incidents in which passengers were killed by oncoming trains when they fell onto the railway tracks at above-ground stations. the people in charge initially rejected such proposals as they felt that the functional purposes were not worth the high cost of installation, but changed their minds when the government announced plans to install half-height automatic platform gates in a speech on 25 january 2008, reasoning that worldwide installations of these gates reduced the market price for them.