Self-driving cars will eventually lower the total cost of driving and it will allow for longer commutes as people will be able to either sleep or do some work while in the vehicle.
The inevitable consequence of that is an increase of car traffic, which means more congestion, noise and air pollution (tires and brake pads). We can't know whether the theoretically lower collisions per distance traveled will translate into lower actual injuries until we know how much the distance traveled will increase.
Most importantly, the more people rely on a particular form of transport, the more they will vote to facilitate it, via more lanes, more highways, more forgiving legislation, etc.
I would rather see more active transportation and more efficient forms of transportation. Four-wheel single occupancy vehicles are just about the worst option of all.
1. Reduced curb space dedicated to parking. If you don't need to come back to the same vehicle you only need space to be picked up/dropped off, reducing the amount of parking spaces needed. This space could be used for separated bike lanes. 2. Safer - This is still an unknown but data looks good atm [1]. It would be even better if AVs could be design to prevent cyclists being doored that would be amazing.
[1] https://arstechnica.com/cars/2023/12/human-drivers-crash-a-l...