From the report this is what it looks like:
Once a week different areas will implement "No vehicle Zone" where private vehicles will be banned and only Public Transport (PMPML) buses will ply. To encourage travellers to use PT buses PMPML will charge a subsidized rate for buses travelling in the No Vehicle Zone. PMC will make up for the losses (caused by subsidized tickets).
Details are not mentioned nor would they have been worked out (going by PMC's past record), so each zone under No Vehicle Plan will experience glitches - some serious which will have the potential to wreck the whole plan, so we should try to get the details and give our views to PMC.
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Sujit