The Bombardier Transportation Systems appears to have the best solution for the U.S. Monorail for the near term. The Bombardier TS has over 26 projects currently within the U.S. too include Las Vegas, Disney, New York, Dallas, Seattle and others. Bombardier TS has a high safety record and seems to meet contract requirements. Conventional Bombardier Monorail and MAGLEV High Speed Monorail details are below. Ref: Bombardier TS information.
Maglev (derived from magnetic levitation) is a transport method that uses magnetic levitation to move vehicles without touching the ground. With maglev, a vehicle travels along a guideway using magnets to create both lift and propulsion, thereby reducing friction by a great extent and allowing very high speeds.
Maglev trains (and potentially Monorails) move more smoothly and more quietly than wheeled mass transit systems. They are relatively unaffected by weather. The power needed for levitation is typically not a large percentage of its overall energy consumption; most goes to overcome drag, as with other high-speed transport. Maglev trains hold the speed record for rail transport.
Bombardier Innovation Contest Produces New Urban Mobility Proposals (Sept 20 2012)
"The second proposal fine-tunes the AutoShuttle concept, which won the YouCity prize in the engineering category. Individual transparent cabins would transport cars along motorway routes on dedicated Maglev (magnetic levitation) lanes at 180 km/h. Drivers would be able to choose at any time to take the next exit and join the conventional road network."
See The Monorail Society "Maglev Monorails" - Push the Button