Thank you all for so many ideas. I knew coming to FreeRepublic was a good place to start.
A couple of thoughts I had.
The folks posting above are correct about tracks, and those can be imbedded in the roadways.
When a vehicle is floating on maglev, it still has both mass and inertia. Just because it is floating it is not weightless, and once it is moving it will be very hard to stop.
The vehicle will automatically follow the magnetic lines of the track so steering is not an issue, however, accelerating and decelerating become problems when you have to share the track with others how may be entering and leaving traffic flow at any time.
Magnetic propulsion could be used to maintain speed once a vehicle is on the track but accelerating and decelerating for each vehicle individually could be an issue. Maybe retractable wheels for entering and exiting freeways as well as neighborhood streets.
Once the vehicle is at highway speed the wheels retract and the vehicle floats on maglev. Each highway lane is 10 mph faster. On a 6 lane highway the left lane is 60mph faster than the entrance/exit lane.
On-board computers control merging from one lane to the next on highways. Vehicles automatically merge by talking to each other and providing space for merging to other vehicles.