I've thought about this grand idea for some time. It's on such a large scale that I wouldn't be able to do it personally, but would require the cooperation of governments and many other agencies. The idea might sound a bit strange at first, but maybe it could partially be implemented in some way:
Instead of using subways or cars, the civic public transportation system could be implemented as a continuous conveyor-belt system run on electrical power. There could be, for example, five different lanes (see image below). Each lane would move at a successively higher speed. All along each lane, there would be seats with seat belts, and people would transfer to various lanes or get on at various points in the city. There would be a cover overhead if it rains.
I haven't really thought about cross traffic going in the direction perpendicular to the lanes, but something could probably be worked out. This type of a system would reduce traffic jams and cause fewer accidents in the city, probably. It's just an idea that I thought of. It may have certain kinks that would need to be ironed out, but it does seem to be a solution to a systematic and organized civic transportation.