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Graeme Wall · December 15th 19, 10:45 AM posted to uk.transport.london

On 15/12/2019 11:24, Roland Perry wrote:
In message , at 09:59:22 on Sun, 15 Dec
2019, remarked:
On Sat, 14 Dec 2019 17:22:53 +0000
Roland Perry wrote:
In message , at 16:58:48 on Sat, 14 Dec
2019, remarked:
Sure, it all goes to plan for a few years. Then ever more people
start to use
the route and in a decade or so you're back where you started except
now the
jams have twice as many cars with twice the pollution. The best
example of
this
in the UK is the M25. No matter how much they widen it it just jams
up again
in a few years. It has 6 lanes each way around Heathrow yet they're
still
often
jammed solid in the rush hour. So what do you do, widen it to 8
lanes, 10?
Where does it stop?

When they plan it better and segregate the long distance and local
traffic. The problem with that bit of the M25 (and I lived *there* 25yrs
ago and saw it first hand) was mixing them up.

And how do you plan to segregate them? Either you allow local traffic
onto
the M25 or you close the junctions.

You build a local road in parallel.

Where? There are already local rads in parallel and they are swamped too.

The newest bit of A14 (remember, the road we are discussing) segregates
them, just as the A1(M) north of Huntingdon does, the road which hasn't
shown any sign of jamming up 20yrs later.

I doubt many people use the A1 for long distance travel in the south
or midlands as there are too many roundabouts,

Almost none left now.

too much slowing down and speeding up and too many selfish truckers
doing the tortoise race holding up a quarter mile of traffic as they
pass each other at 0.5mph difference in order to gain 1 minute that
they immediately lose at the next roundabout anyway.

There typically isn't a "next roundabout", but I agree that HGV-races
are a pain, and hence why some roads (like the new A14, and the 20yr old
A1(M) in north Cambs) are built with more than 2 lanes.

They tried banning HGVs from the outside lane on a hilly section of the
A34 around Didcot. It was routinely ignored and TVP didn't have the
resources or inclination to police it properly.

--
Graeme Wall
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