NEW DELHI: Travelling by DTC bus? Think twice as about 600 drivers are alleged to be colour blind but still driving on the basis of fake medical fitness certificates . This serious issue concerning safety of passengers has been brought to the notice of Delhi chief minister Arvind Kejriwal by information commissioner M Sridhar Acharyulu . In an open letter to the chief minister, Acharyulu said he came across the information that hundreds of drivers have produced fake medical fitness certificates and continue to work on the basis of it. "It is alleged that at least 600 have colour blindness and many others suffer from other problems. I apprehend (and every one will agree) that if this is even partly true, the right to life of commuters in Delhi city will be under serious and constant threat until it is ensured that every driver is fit enough to drive the buses," Acharyulu wrote in his letter to Kejriwal. Expressing his helplessness in taking any action but to order disclosure of information, the Information Commissioner said the RTI application was about a single driver, which led to investigation leading to revelation that hundreds of such drivers were allegedly appointed without "fitness". "The matter of concern is that the RTI application dates back to June 18, 2012, which is passing through different layers of bureaucracy and yet to reach finality. During submissions Vigilance officer and appellant said that several hundred cases of such appointment of drivers without fitness are suspected and need to be enquired into," he wrote. Underlining that he was writing this letter in the capacity of a citizen, Acharyulu said there was a serious urgency to look into the issue.