How does Rockstar Studio program the AI so that it walks on the sidewalk, wait for the green lights, call the Taxi, and even call the cops?

if (random() > 4){    call_for_taxi();}else if (light.isGreen()){    move_forward();}else{    halt();}

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Original post by Freeman2430 How does Rockstar Studio program the AI so that it walks on the sidewalk

Probably some sort of node/path system

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Original post by Freeman2430 Wait for the green lights

Conditional nodes

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Original post by Freeman2430 call the Taxi

By changing some internal state and playing an animation? Then set the location to a flag that tells taxis in the area that someone needs a pickup

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Original post by Freeman2430 and even call the cops?

If the player does something violent/illegal within a certain radius, call the cops with a certain probability?

I don't know these things for sure, but they can be approximated pretty quickly with these sorts of things. Of course, the finer details take the most effort.