Chennai is famous for its street food culture, and there are many street food vendors in the city who offer delicious and affordable food. Here are some popular street food vendors in Chennai:

1. Murugan Idli Shop - This iconic eatery is known for its fluffy idlis and spicy chutneys.

2. Ratna Cafe - Ratna Cafe is a legendary Chennai eatery that has been serving South Indian snacks and meals since 1948. Their specialty is the sambar vada and the dosa.

3. Rayar's Mess - Located in Mylapore, Rayar's Mess is known for its homely food and South Indian dishes. It is famous for its thali meals.

4. Sowcarpet Murugan Idli Kadai - Located in the bustling neighborhood of Sowcarpet, this eatery is known for its soft idlis and crispy vadas.

5. Nungambakkam Railway Station Canteen - This humble canteen located near the Nungambakkam railway station serves some of the best biryanis and parottas in the city.

6. Madras Coffee House - Located in the heart of the city, this iconic coffee house is known for its South Indian filter coffee and snacks.

7. Kothu Parotta - This popular street food is made by chopping up parottas and stir-frying them with vegetables, egg, and spices. It is a popular street food item that is available in many places across the city.

These are just a few of the many street food vendors in Chennai. Chennai's street food culture is diverse and vibrant, and there are many other vendors and eateries that offer unique and delicious food.