Mumbai, May 20 -- Two days after the Centre issued guidelines for the fourth phase of the lockdown which began on May 18, the Maharashtra government extended more relaxations to rural and semi-urban areas, excluding them from the existing red zones. The existing orange and green zones are now 'non-red zones' and almost all activities in these areas have been opened up, health minister Rajesh Tope said. While commercial and other activities are allowed in non-red zones, the restrictions imposed earlier will continue in red zones. The revised guidelines will come into effect from May 22. The earlier colour-coded classification of district-level red zones has been changed to municipal corporation level. Eighteen municipal corporations, including all nine from MMR, are in the red zone....