This is a handy tool from mapquest.com. Gas To find CNG in LA.
Rules & Regulations
All cabs are subject to the Rules and Regulations of Los Angeles' Department of Transportation. (D.O.T.) Click Here Every legal cab in LA will have the sticker (shown below) posted inside in plain view.
Metro Link Map
Use phone number (323) GO.METRO to plan long or short trips trips. More info can be found here. or here.
Click on Picture for larger view.