View Single Post
  #47   Report Post  
Old June 19th 19, 12:39 PM posted to uk.transport.london
Basil Jet[_4_] Basil Jet[_4_] is offline
external usenet poster
 
First recorded activity at LondonBanter: Sep 2014
Posts: 1,385
Default Latest Heathrow master plan

On 19/06/2019 12:21, Roland Perry wrote:
In message , at 07:53:25 on Wed, 19 Jun
2019, Recliner remarked:

They'll build the diverted, sunken, bridged M25 to the west of the
current road, with no disruption to road or air traffic during the
building, which might take a couple of years.

The only disruption will come at the end, when the traffic is diverted to
the new route. My guess is that the northbound traffic will be moved
first,
with a few weeks of lane 1 closures required while they connect the
new to
the old carriageways, then an overnight closure for the final switch
to be
made. The same procedure would then be followed a few months later to
divert the southbound carriageway to the new alignment.


The amount of work you would be expecting them to do "overnight" beggars
belief.


I disagree, I don't think even an overnight closure is required. You
reduce it to one lane overnight while you repaint most of the
carriageway to have four (five?) lanes curving onto the altered
alignment. You stop the traffic for a minute while you "change the
points" and route the one traffic lane into a different coned alignment
over the already painted area. You then remove the earlier cone route
and finish painting the carriageway. Then put concrete barriers guarding
the abandoned route and remove all the cones. It's quite common for the
M25 to be down to one lane at night, and far preferable to shutting it.

--
Basil Jet recently enjoyed listening to
Nine Horses - 2005 - Snow Borne Sorrow