The blue public bus, known as a Pothong, was carrying five passengers at the time and had just left the Tha Chat Chai checkpoint heading to Phuket Town when the driver lost control of the vehicle and hit the pole in front of Baan Nasompor Mosque on Thepkassatri Road.
Mai Khao Police arrived on the scene and found three women injured, one of them severely. All three were taken to Thalang Hospital.
Lt Col Anek Mongkul said: "The driver, Lek Lomchat (63 years old), escaped without injury but he was taken to hospital to check for alcohol level."