The Metro has separate platforms and cars reserved for women (and children under 12). While some passengers (or police) may not object to handicapped men using the generally less crowded Women’s cars, it is illegal, and women are likely to object.
The METROBUS, on the other hand, was designed for wheelchair users, with ramps, special seating for the handicapped. Men and “persons of the third age” (i.e. “old”) people, regardless of gender, can use the front section of the bus, which is also for women and children.