Taxi and Ambulance

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You know, those two civilian vehicles - Taxi in Level 2 and Ambulance in Level 5 - could have their side missions as you drive them. Taxi collects and drops off fares to their destinations, and Ambulance picks up and takes patients to the hospital. Works exactly the same way as in the 3D Grand Theft Auto games - III, Vice City and San Andreas.
From what I know Donut Mod features Taxi collect missions & there is also a a mod based on the concept.
You should check them out, they're both great. AFAIK there's more mods featuring this concept, but I don't have a list of them unfortunately.