Yeah, I'ma kind of upset they didn't have more jobs available for you when you get in certain vehicles.
You used to be able to get into Fire Engines, Ambulances, Police Cars and Taxis and just start doing jobs for them for money.
Then in GTA 4 you could only do it in Roman's taxis, or in police cars (where there was a set amount of missions to do).
And now in GTA 5 you can only do it as Franklin, in the Taxis he owns, IF you purchase the Taxi place. No Emergency Services at all. Yeah, it's realistic, but I don't mind losing realism in exchange for more activities.