Have a City reference design that will have to move about 30,000 people
worst case in an hour and a half at the worst point (near the city center
metro stop), at rush hour. There would be separate Pedestrian crossings but
would only be as low as ten feet. These passenger transport routes would
most likely be five feet below the surrounding pedestrian grade. Low
Clearance truck freight , taxis and occasional cars would share the route
with the passenger transport system. No Bicycles would be allowed in this
depressed grade. The Five foot depression and ten foot ped bridge clearance
puts the ped crossing at 6 feet above the surrounding pedestrian grade if
there is one foot of structure thickness in the foot bridge This is the
minimal grade delta for perceptibly agreeable pedestrian access across such
throughways (similar to Venice)..
So what passenger transport system can meet these criteria? Third Rail
doesn't allow other vehicles (non-tracked) on the road, does it? Catenary
systems need much more overhead clearance don't they? And buses are not as
desirable to passengers, are more costly in the long run and can't meet the
worst case throughput requirements can they?
Note, that this scenario, I think, will be in a large class of relatively
carfree designs and retrofits where J.H. Crawford's a Metro Stop and a *Rail
freight line in every district feature's initial cost gets vetoed in favor
of a mixed mode distribution that takes a middle point initial vs.
sustaining cost approach. And where transit route impacts on Pedestrians are
more thoroughly accounted for. Note that Venice, can in fact be a model for a city
with car separation, not a truly carfree city in that the little personal motor boats are the cars,
the smaller rowed boats (typically Venetian Sandola) are like personal pedicabs,
the Gondolas (when used centuries ago) as then public and private pedicabs.
The Vaporetti are the bused, etc... The important point is that there are VERY limited
parking spaces for these personal cars (motor boats and row boats) in Venice and in my
reference designs; after accounting for bus or tram platforms, freight docks, taxi platforms
there is almost no parking space for autos. Venice accommodates pedestrians better than
any mixed mode city I know of, so a non-water based model should be considered...