What is the fine-grained topic of the following text: Wichit Mayor Kreetha Saetan said the municipality and local public health workers have pleaded with mobile food vendors for over a year not to set up along public roads, especially in the market area across from the Phuket Villa 3 residential estate on Chao Fah East Rd. Only return the topic.
Regulation of mobile food vendors in Wichit, Phuket