A bench of justices Badar Durrez Ahmed and Sanjeev Sachdeva said Delhi Transport Corporation (DTC) has not filed a report sought by it and directed it to do so within two weeks.
With the direction, the court listed the matter for further hearing on August 19.
Earlier, DTC had informed the court that 91 of its drivers, who were earlier found to be colour-blind, were at present not driving any of its vehicles.
The court was hearing petitions by NGOs Azaad Dasta Sankalp Hamara and Nav Jagrity Manch alleging that many DTC drivers were unfit to drive as they were colour-blind and several others did not have valid driving licenses.
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The PILs have alleged that most of the over 4000 DTC drivers recruited in 2007-08 were colour-blind and sought their medical re-examination.
Thereafter, another medical board was constituted and about 56 candidates, who were earlier found unfit, were examined by Guru Nanak Eye Centre which had declared majority of them as fit, the petition had said.
The NGOs have contended that most of the over 850 drivers, found medically unfit by DTC medical board, were suffering from eye defects, including colour-blindness.
They have also alleged that according to reports, several DTC drivers have been found to have fake driving licenses and FIRs had been registered against several such persons.