The personal rapid transit system type would have features as listed:
ability to be placed above roads
ability to be placed independently
ability to be placed underground
A special transition piece between being elevated above roads and underground while in the center of the road.
ability to be placed on ground level, but cannot cross roads at grade
ability to have 90 degree corners
must have a narrow guideway
stations must be off of the main line, but like the monorail can be placed above or beside the street, or underground.
must have a special depot to connect to the system
ability to modify the number of vehicles on the line
and lastly, the pods can bypass other stations to get citizens to their destinations faster like a taxi