Bangkok's widely feared traffic police are at the centre of a corruption scandal following the exposure of one of their most common practices. Thai television network ITV has been giving blanket coverage to secret footage of illegal 'instant fines' being levied by officers stationed at an expressway on-ramp. The footage shows uniformed officers glancing the other way as errant drivers place bank notes in their hands or truck operators throw wads of baht out of the windows of their overloaded vehicles. Interior Minister Sanan Kachornprasart has stopped short of calling for a full inquiry but ensured three officers identified in the film were suspended pending full dismissal. A fourth officer on Thursday turned up at ITV's offices armed with a pistol and threatened to commit suicide, saying he feared being identified if the footage was replayed. He was subdued and quietly left soon after. A group of 50 others have lobbied ITV claiming they only acted on the request of superiors who demand a fixed quota of tickets and pocket most of the proceeds. Commercial drivers said they were 'amazed' the footage had received so much attention. 'This has long been part of life in Bangkok . . . we calculate fines into our regular monthly expenses,' said Uluwan, a taxi driver. 'I never thought I'd see it on TV it is so common . . . but let's hope something comes of it. The police don't care about road rules, just the cash.'