Modern highway overpasses accept four Hallitubes...| Based on typical single driver two- lane highway
utilization, these four tubes can probably absorb half of the traffic of
one direction of a two lane highway, based on reasonable separation of
vehicles. The capacity for Quads also weakens the argument that exits cause
delays. Each of the four tubes has different exits. Thus the exit frequency
is a fourth of the accompanying highway for each tube, but the entire system
can have the same exit frequency. Note also that once the tube winds itself
into a neighborhood, speed drops, making tube switching (relatively ) faster
as it is still conducted at the same high speed in terms of rigid halting and re-acceleration. Note that it may also be possible to add a middle quad section in addition to the one going into the opposite direction. As you think about operation, always remember the refrain: "entry is slower than exit" . (No propagating braking wave). |
