A study into driverless cars has used a "ghost driver" to record other road user's responses.
source https://www.bbc.co.uk/news/uk-england-nottinghamshire-65857348?at_medium=RSS&at_campaign=KARANGA
source https://www.bbc.co.uk/news/uk-england-nottinghamshire-65857348?at_medium=RSS&at_campaign=KARANGA