Hello,

On the subject of high volume roads, does anyone have examples of
multi-lane roads in or near urban areas which have been reduced by a lane &
the reclaimed space planted with trees/soft landscaping in order to improve
air quality?

Many thanks

Lucy

Healthy Streets Adviser
Project Centre




On Thu, 13 Jun 2019, 20:53 Rob Bain, <[log in to unmask]> wrote:

> Many thanks, Robert.  I did mean 'per day' (apols).
>
> There's a lot of websites out there that give traffic performance, but
> very few list the associated number of lanes (and capacity per lane is my
> focus).  I know CHT in Hong Kong, by the way.  It has exceeded 30k/lane
> from time-to-time.  As has Bosphorus and the M4/M5 in Sydney.  I'm trying
> to find other examples in the 30s.
>
> Plenty of dodgy forecasts in the 30s (I know, I've met some of them in
> court!) but it's observations that I'm interested in.
>
> Thanks again.
>
> Kindest regards,
>
> Rob
>
> Robert Bain
> RBconsult Ltd
> Investor Support Services
> www.robbain.com
> +44 1732 463314
>
>
> NOTICE OF CONFIDENTIALITY.  This communication is intended only for the
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> -----Original Message-----
> From: Robert Cochrane [mailto:[log in to unmask]]
> Sent: 13 June 2019 14:37
> To: Rob Bain <[log in to unmask]>; [log in to unmask]
> Subject: Re: [UTSG] High-volume roads/motorways?
>
> Hi Rob
>
> Think you mean "vehicles per lane per day".  And do you mean vehicles or
> PCUs?  In terms of vehicles, the M25 at J15 with eight lanes carries about
> 210,000 vehicles per day or about 26,000 vehicles per lane per day.  Using
> a twelve  hour day to estimate the peak (my guess, but the figures are
> available), this is a peak of about 2,400 vehicles per hour per lane, which
> is similar to the UK COBAR maximum recorded hourly values in the 1990s.
> Speeds are falling in this regime, so the flow is becoming unstable, So
> 2,500 vehicles per hour per lane is a good absolute maximum and the rest is
> the daily flow and peaking.  US figures are slightly less at about 2,200
> but that may be a measurement difference.  German Autobahnen in urban areas
> are similar (how good is your German?) 2,500 gets the flow well into
> unstable and potential high crash risk territory, but the M25 has a lot of
> advanced warning signage and also the expected pile ups particularly in
> poor weather or suddenly changing traffic conditions as any reduction in
> speed DECREASES the possible traffic flow
>
> Some tunnels and bridges have slightly higher daily figures, as I found in
> Hong Kong, but these are usually carefully managed pinch points with only
> four lanes and the jams occur on the approaches where merging is the major
> issue.  Plus different (lower) peak factors for the daily figure.  The
> original cross harbour tunnel carries about 118,000 vehicles per day on
> four lanes or about 29,500 per lane.  Dartford Crossing carries about
> 160,000 per day on eight lanes, with a higher peak factor as it is not
> downtown and probably a similar peak figure, although this may also be
> reduced by the high truck component as it is the London bypass from Dover
> as well as the London peripheral.
>
> So first, are you looking at managed and tolled pinch points or open
> untolled road sections as the management problems differ. Second, check
> whether the figures are vehicles or pcus and one or both directions and the
> numbers of lanes.  If the answer for vehicles per lane per hour free flow
> is not between 2000 and 2500 something is wrong.  40% to 50% of this for
> priority traffic light controlled roads.
>
> So check the definition and the peaking and the truck percentage and in
> the UK, look no further than the bottom left hand corner of the M25 for
> free flow and Dartford Crossing for managed and tolled pinch point and in
> Hong Kong, the original cross harbour tunnel. All have good stats. And
> consider peak and all day separately.
>
> Best wishes
>
> Robert
>
>
> The upper limit
>
> On 13-Jun-19 01:37 PM, Rob Bain wrote:
> > Hi
> >
> > I'm looking at some very high-volume roads around the world (at or above
> 30,000 vehicles/lane/hour).  As you can imagine (from these volumes) the
> roads are very intensely used from early morning through to late evening.
> >
> > Do we have examples of roads in the UK where these sorts of volumes (per
> lane per hour) can be observed?  Or in other countries?
> >
> > Any thoughts anyone?
> >
> > Thanks in advance.
> >
> > Rob
> >
> > Robert Bain
> > RBconsult Ltd
> > Investor Support Services
> > www.robbain.com<http://www.robbain.com/>
> > +44 1732 463314
> >
> >
> > NOTICE OF CONFIDENTIALITY.  This communication is intended only for the
> use of the addressee and may contain confidential and privileged
> information. If you are not the intended recipient, you are notified that
> any dissemination, distribution or copying of this communication is
> strictly prohibited. If you have received this communication in error,
> please notify the sender immediately or, alternatively, immediately destroy
> this communication.
> >
> >
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