Travelling around Chiang Mai is a breeze in these red cabs, you can stop them anytime on the street. Driver may be carrying passengers at the back but its alright, it operates like carpool.
Pros: Cheap and fast. Flag down any cab for 20 Baht per pax. Some may request 30 Baht so make sure you agree on the price before boarding
Cons: No aircon and may need to share cab with other passengers (works like car pool)