The new A3 and A4 buses will have a flat fare of Bt30 and each route will be serviced by five Euro II-standard buses.
The A3 bus will run on the Don Mueang tollway to Din Daeng, Pratunam, Ratchaprasong, Rajdamri to Lumpini Park.
The A4 bus will run on the Don Mueang tollway, past the Sirat Expressway, Yommarach, Larn Luang, Phan FA, Democracy Monument, Wat Bowonniwet, Khao San to Sanam Luang.