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> You can have an abstract agent class/interface with virtual "drive(Car c)" method. The method would be overriden by AIAgent, HumanAgent etc.

Is that a convoluted way of saying "use multiple dispatch", or am I reading it wrong?

I think you are over engineering it. The way I imagine it:

Car {float throttle, float brake, float wheel} inherits PhysicalObject {velocity, mass, position}

Agent.accelerate(Car c){ c.throttle++; }

Agent.drive(Car c){ ... accelerate(c); ... }

Human inherits Agent

Interface is the best way to do a clean job in this case.

Kill me now