Richard Laymen/
Rebuilding Space in The Urban Space makes some good points about the need for road tunnels in urban areas, even as he so far fails to defend the space to facilitate their construction, from badly located new real estate development.
http://urbanplacesandspaces.blogspot.com/2016/02/london-mayor-proposes-roadway-tunnels.html
London Mayor proposes roadway tunnels to divert surface motor vehicle traffic and congestion
Central Artery before and after, Boston.
According to the
Guardian ("
Boris Johnson unveils road tunnel plans to ease London congestion"). From the article:
“Around eight of every 10 journeys in London are made using our roads –
whether by car, taxi, motorbike, bus, cycle, foot or freight – which is
why it is vital that we think big. We must deliver long-term solutions
that will not just make the most of the space we have for road users but
bring environmental and amenity improvements to local areas.” ...
He added: “By pushing forward strategic initiatives we are outlining
today, we will lay the foundation for the next wave of improvements to
everyone’s experience of the road network across the city.”
The major road tunnels are based on the strategies pursued in Stockholm
and Boston, although the latter’s “Big Dig” proved difficult, costly and
controversial. The success of flyunders in transforming parts of cities
such as Madrid, where its inner ring road was partially buried, may
make the smaller projects more viable. TfL believes a 1.3km tunnel at
Barking could create a new neighbourhood of 5,000 homes in a blighted
area, and that either tolls or the housing could make the project pay
for itself.
Who knew that there is the
International Tunneling and Underground Space Association?
-- "
Urban Road Tunnels," ITA
-- "
MADRID CALLE 30: AN URBAN TRANSFORMATION PROJECT"
I mention this because I have suggested this in the North Capitol-Blair
Road corridor in DC, and support it for through traffic on New York
Avenue (the equivalent of a connection between I-95 through DC to
Virginia)--this is not my idea originally, it was suggested in the New
York Avenue Transportation Study about ten years ago. 16th Street NW
would be another corridor where this is worth considering.
[DW- That study proposed a tunnel connecting to the I-395 Center Leg to the northeast under New York Avenue; it made no reference to any northern radial corridor as North Capitol-Blair Road, nor the parallel B&O].
The justification is that the negative impacts on abutting neighborhoods
are significant and worthy of mitigation. The underground trip would
be faster and therefore should be worthwhile for users, thereby
justifying toll charges for the privilege. See "
Tunnelized road projects for DC and the Carmel Tunnel, Haifa, Israel example--tolls."
I didn't know about the Madrid example. Marseille removed a highway
along the waterfront by shifting it to an underused rail tunnel.
Thessaloniki built a tunnel around its historic traffic to divert
traffic and create a more pedestrian-centric environment along the
waterfront.
t.
In
Long Beach, an undergrounded rail tunnel, the Alameda Corridor, was
built to facilitate freight movement between the port and the freight
railway system.
It could have been interesting to have also built a tunnel for truck
traffic between the port and the highway system, since the road system
is inundated with truck traffic generated by the port.
Miami is creating such a facility, the
N.W. 25th Street Viaduct Project, between the Miami Airport's cargo hub and the local freeway system (pictured at left).*
Of course, Boston's "Big Dig" or Central Artery Freeway is another example ("
10 years later, did the Big Dig deliver?,"
Boston Globe) although it is not tolled.
Note that the tunnel underpasses in various places in the city, such as
at Massachusetts Avenue and Thomas Circle for the roadway system and on
North Capitol Street between M Street and Rhode Island Avenue, were
early attempts to facilitate traffic movement but without providing
simultaneous improvements in conditions for neighborhoods and the urban
street fabric.
Capitol Crossing, before.
The
Capitol Crossing
development, which will deck over of the I-395 freeway between
Masachusetts Avenue and D Street NE is an example of decking over an
existing facility, without creating a new tunnel.
[DW- Alas, it reduces the right of way profile 50% with zero consideration of the comparisons of the real estate project's extra profitability versus that of restoring the lost capacity via a pair of new parallel tunnels]]
Reknitting the street grid in Washington by decking over more of I-395.
==========
* Separately, I wonder if the Long Bridge reconstruction project--the
bridge carries passenger railroad, freight railroad, and subway trains
over the Potomac River between Southwest DC and Arlington County--should
add lanes for a bi-directional dedicated busway.
It could serve National Airport when the subway is closed as well as tour bus traffic and other bus traffic to and from DC.
posted by Richard Layman @ 11:34 AM&Permanent Link
http://wwwtripwithinthebeltway.blogspot.com/2008/02/extending-legacy-with-grand-arc.html
Do be sure to write out about misplaced real estate development placed too close to such corridors in in other wrong places as "The Hampshires" townhouses that are essentially demolition specials, as well as poorly designed projects as the Capitol Cross project that combines the righteous idea of covering the Center Leg with the foolishness of wasting up to 50% of its capacity, thus necessitating a new pair of parallel cut and cover tunnelways.
http://wwwtripwithinthebeltway.blogspot.com/2007/09/washington-dc-big-dig.html
http://wwwtripwithinthebeltway.blogspot.com/2007/11/i-395-extension-superior-option.html
Thankfully the more recent Dunbar HS building replacement does not conflict with doing that.
Such could then continue as a duel stacked tunnel beneath O Street before turning to join the railroad corridors.
A tunnel beneath New York Avenue would be better for a continuation of a cross-town I-66 Tunnel that from Mt Vernon Square to Washington Circle run beneath K Street- the idea favored by opponents to the 1950s plan for a new swath along Florida Avenue and U Street.
To the east of the railroad, the cut and cover tunnel should then run alongside New York Avenue with a box containing highway and a new WMATA rail subway, beneath a linear park and new development with a deck atop the rail chasm.
The authorities subverted the idea of extending the tunnel east by only considering the pricier, more disruptive and less profitable idea of placing it directly beneath New York Avenue.
http://wwwtripwithinthebeltway.blogspot.com/2015/01/new-medievalism-overides-popular.html
cf. the width of the High Line.
However, it could be worth doing it it were possible to double but probably triple stack tunnels for railroad and subway transit.
But it would cost many billions, and the benefit would likely not be greater than the cost.
Selective tunnels for roads could have much greater social and economic benefit.
I don't know exactly how the track is threaded, but it seems that from New Carrollton you can figure out how to get to Annapolis, and from New Carrollton to DC there is no need to tunnel.
Just do a London Overground in terms of organizing the service, as I outline in past posts.
2. The I-66 idea is interesting but I don't think serves much purpose. But you could build it in conjunction with the proposed separated blue/silver line that I have written about in the past. Dumping traffic on city streets isn't something that makes sense.
3. But in conjunction with I-66, I've suggested a cut and cover tunnel for an RER type line out of Union Station (a continuation of Penn Line) which would be electrified.
4. I don't know enough about electrification technology to figure out how to make an Annapolis to DC rail line electrified rather than diesel. Maybe it's just as easy to put it underground to be able to electrify it.
Probably the best analogy in the various plans in DC to bridge/tunnel over E st and the area around 66 and the Kennedy Center.
(Again, we have the tunnel machines but the shadow government only wants to use them for sewage, not for transportation. Different funding buckets)
Or to blow the willinger's mind, build a tunnel under K, run it under georgetown (and take down whitehurst), go under the potomac and then up Spout run).
The displacement besides the 34 or so targeted by the 1966-70 plan would be confined to the foolishly misplaced new buildings such as the 2 Arts Space buildings nearest to the RR.
To the north, recently recklessly located buildings as the Elevation 314 project would be demolished, as they should as safety hazards as residential wood framed buildings within a footprint of a potential freight rail derailment from a set of ELEVATED tracks, as would the Cedar Crossing and a corner of the adjacent project. The late 1990s Takoma Co-Housing project is thankfully just outside the footprint. To the north, the historic Cady Lee mansion and the row of houses along Takoma Avenue would all be avoided; however the foolishly placed mid 1960s Montgomery Gardens apartment complex would be at least partially demolished.
For the connection to the PEPCO corridor, a depressed, part or all covered link along the north side of New Hampshire Avenue would displace 27 1940s houses just inside D.C., strip retail just inside Maryland, and of course a good chunk of that recent demo special of "The Hampshires" which was a completely irresponsible development, before swinging across New Hampshire Avenue to run via the PEPCO corridor to the I-95 stubbs at the Capital Beltway. To address the challenging topography, I would have NH Avenue upon a new bridge with I-95 passing through its southern abutment.
New retail and housing could then be constructed in a lid atop the NHA I-95 segment, rather than keeping it as an open trench. I would do the same in spots to the north along the PEPCO corridor, including a lid with such at University Avenue.
The benefits would be immense. Not simply for achieving a full northern I-95 link plus one towards I-270 and a cut and cover tunnel beneath Georgia Avenue as an alternative to the old Northern Parkway proposal. But as well with the creation of a vast new northern radial park - a northern Mall in essence - for Washington D.C. extending down to the rear of Union Station- already the existing end-cap. And furthermore, as I see it, with a resurfacing of the long buried Tiber Creek.
New high speed tolling would make this only even more practical.
Something akin to that was briefly proposed by the Committee of 100 cir 1968.
A variant of that would be to build a 3 Sisters Bridge, but rather than the mess of spaghetti for its approaches, do those via a tunnel that makes the elevation change arcing beneath the recreation field of Georgetown University.
The existing I-66 terminus near the Watergate ought to be reconstructed as an underground semi-Orb beneath a new pedestrian park overlook.