You can find street prostitutes from many Delhi road when it gets dark.
Very popular area for street hookers is Raja Garden intersection.
Most street prostitutes are not on the roadside but you find them on auto rickshaws in that region.
Other areas in Delhi where you can find street walkers are G.B. Road, known as Red Light area of Delhi, Moolchand Flyover, Lajpat Nagar, Katwaria Sarai, Outside Jangpura DDA Park, Near Krishna Market, Lajpat Nagar and Near kohat enclave metro station.
Street prostitutes in India are very cheap and you can have sex with them for under $10 USD.