[watter]

If someone barfs in the taxi (which I think is quite common tbh) it may not be visible to the camera even if they wipe it up.

In either case, that car still smells like barf until it is really cleaned.

Pretty sure if I got in a car that was full of barf while on my way to the airport I would stay in the car (and probably barf a bit myself, too).

[jackvalentine]

It amuses me to think somewhere there is a team of engineers developing barf detection systems for driverless vehicles. Perhaps using a combination of camera, sound (imagine collecting the training data for barf sound machine learning!) and scent detection.