Today’s invention is a system by which a car driver can control the degree to which any of the other doors may be opened.
This allows the driver to ensure that no-one (eg children or people with impaired vision) flings a door into the face of a cyclist or into the side of a nearby vehicle.
The driver would have a graphical control unit, perhaps on the steering wheel, which would allow him/her to check in the mirrors and set the maximum opening angle accordingly.
This could be set to say 20 degrees initially, so that a) no child could get out unsupervised and b) the driver could then gradually ease each door open just enough, in turn, to allow passengers to exit safely.