Bidston Moss Junction

Good Morning

 

Thank you for your request below, Wirral Council Technical Services
department can provide the following recorded information in response to
your request; please note names and personal information have been
redacted from correspondence:

 

Surveys

None undertaken by Wirral Council

 

Studies....

As part of the recently completed Bidston Viaduct refurbishment
project, it was agreed that the main contractor (Costain) would undertake
additional works to realign the entry leg to Dock Links North to try and
address a proven history of recorded personal injury accidents resulting
from traffic carrying high speeds from the A554 southbound approach
through onto the roundabout and up the slip road to the Docks Link North.

 

In conjunction with the entry-leg realignment, screening has also been
provided (to Highway Agency specification) to deliberately reduce
visibility and thereby force traffic to slow down and give way before
entering the roundabout. The provision of such screening is a recommended
method (see note re: 'Specialist advice' below) of restricting approach
visibility where the approach visibility of traffic on the circulatory
carriageway (or preceding entry) is too generous and results in vehicles
adopting an inappropriate high entry speed.

 

Reports

None undertaken by Wirral Council

 

Specialists advice...

Para 8.8 of The Highway Agency's Design Manual for Roads & Bridges -
VOLUME 6 ROAD GEOMETRY, SECTION 2 JUNCTIONS, PART 3 - TD
16/07...'GEOMETRIC DESIGN OF ROUNDABOUTS' states:  

Excessive visibility to the right can result in high entry speeds,
potentially leading to accidents. On dual carriageway approaches where the
speed limit is greater than 40mph, limiting visibility to the right by
screening until the vehicle is within 15 metres of the give way line can
be helpful in reducing excessive approach speeds. The screening should be
at least 2m high, in order to block the view of all road users.

 

Correspondence - discussing, advising or otherwise the merits or dangers
of such a construction.

...between council employees (Email correspondance attached)  

...external organisations (Email correspondance attached)

...external organisations (minutes of meeting 14th December 2009 attached
+ plan + fence specification)  

Please see attachments.

 

Thank you for your enquiry, I hope that you find this information useful.

 

Kind regards

 

Tracy O'Hare

FOI Co-ordinator

CH41 6BU

 

 

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