Now some buses are also introduced in some cities. The usage might have increased by this time. But COVID 19 there is no much progress. But slowly there may be more buses and that is need for controlling the pollution. Solar power as an alternative to these batteries is also a good concept and some work is going in this direction also, I heard.
Solar power in running the bikes and scooty may be the answer but it requires further research to improve its mechanism. There has not been much breakthrough in that direction and it may take still more time to make this programme successful.
K Mohan @ Moga
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease