In a letter written to Mamata, Patkar said she was stunned to know that the Kolkata Traffic Police had recently passed an order banning cycles, hand carts, pull carts, tri-cycles and other forms of non-motorised transport off the roads from 174 major and minor streets in the metropolis.
Demanding that the ban be revoked, the Narmada Bachao Andolan activist said it was an "anti poor and anti working class step".
Patkar, also the convener of the National Alliance of People's Movements in New Delhi, said millions of poor and working class people in Kolkata were dependent on these forms of transport for earning an honest living and also commute using them within the city.
"Cycles are a perfect manifestation of your party's slogan and vision - since bicycles and non-motorised transport are socially inclusive, directly support livelihoods, inexpensive; take much less space, good for the environment and health, and least likely to cause jams and accidents," she said.
She also cited data from the Union Ministry of Urban Development which shows that Kolkata is the only metropolitan city in India where trips by cycle (11 per cent) outnumber trips by cars (8 per cent).
Since Kolkata has the lowest number of private cars and the least amount of road space, cycling is practical and popular besides being a non-polluting mode of transport, she said.