tuktuk is expensive joke, pretty much on par with airconditioned taxi without inhaling exhaust smog and safe, both of them are in the end stucked in traffic jam, no matter that tuktuk is smaller
you must get of the roads not to be stucked in traffic unles you use (moto)bike, it's shame they canceled Bangkok green bike, used to bike using them long time ago, but was disapointed years ago when I found project was cancelled