Letter: Phoenix-Tucson rail

I agree with Myla Lutes-Clark that a passenger rail line between Tucson and Phoenix would be great! However, it appears to be decades in the future. An action that could be taken right now would be a frequent bus between the cities. A fully loaded bus is much more fuel efficient per passenger mile than individual vehicles. Until the frequency of a train becomes substantial, the rail line sits there unused much of the time. The existing roads, however, support multiple uses and become more economically efficient. To ensure buses does not get stuck in traffic, they could use "high occupancy vehicle" lanes. To make these lanes more efficient, so they don't sit empty much of the time, variable tolls can be applied to the lane for other vehicles. The toll would be increased or decreased as required to keep the lane occupied with vehicles running at the speed limit.