A40 new 40 mph average speed limit

M Williams made this Freedom of Information request to Transport for London

This request has been closed to new correspondence from the public body. Contact us if you think it ought be re-opened.

The request was successful.

Dear Transport for London,

As of the start of this month, the average speed check speed limit on the A40 in the section that previously was 50 mph and then temporary 30 mph, is now 40 mph(section from approx Polish war Memorial Roundabout to Perivale).

Could you please confirm if this 40 mph limit is also temporary? and if so why it is in place? As the temporary 30 mph limit was there to monitor the central reservation and the monitoring is now complete, when will the central reservation be replaced/repaired?

If the new 40 mph speed limit is not temporary, why has the speed limit been reduced from the previous 50 mph? How many serious accidents were there on this section whilst the limit was 30 mph? in order to warrant a 10 mph reduction in the speed limit of a 3 lane dual carriageway in a section of it where, unlike from Perivale onwards, houses are not directly accessible from it, i.e there is a slip road in front of the houses in this section, or there are no houses at all.

In a previous FOI request from another individual you stated the reason the 30 mph limit was put in place was "To ensure that safety of all road users
is maintained we implemented a 30mph speed limit while we investigate the
least disruptive way and time to replace the central barriers. "

How would reducing a speed limit impact your investigation?
Were accident levels monitored during the investigation? what other items were monitored during the investigation?

Thank you for your time

Yours faithfully,

M Williams

FOI, Transport for London

Dear Mr Williams

 

TfL Ref: FOI-1702-1819

 

Thank you for your email received by Transport for London (TfL) on 25
September 2018.

 

Your request will be processed in accordance with the requirements of the
Freedom of Information Act and TfL’s information access policy. 

 

A response will be provided to you by 23 October 2018.

 

We publish a substantial range of information on our website on subjects
including operational performance, contracts, expenditure, journey data,
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frequently asked for in FOI requests or other public queries. Please check
[1]http://www.tfl.gov.uk/corporate/transpar... to see if this helps you.

 

In the meantime, if you would like to discuss this matter further, please
do not hesitate to contact me.

 

Yours sincerely

 

Eva Hextall

FOI Case Officer

 

FOI Case Management Team

General Counsel

Transport for London

 

 

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FOI, Transport for London

1 Attachment

Dear Mr Williams

 

TfL Ref: FOI-1702-1819

 

Thank you for your email received by Transport for London (TfL) on 25
September 2018.

 

Your request has been considered in accordance with the requirements of
the Freedom of Information Act and our information access policy.  I can
confirm we hold some of the information you require. You asked:

 

Could you please confirm if this 40 mph limit is also temporary? and if so
why it is in place? As the temporary 30 mph limit was there to monitor the
central reservation and the monitoring is now complete, when will the
central reservation be replaced/repaired?

 

If the new 40 mph speed limit is not temporary, why has the speed limit
been reduced from the previous 50 mph? How many serious accidents were
there on this section whilst the limit was 30 mph? in order to warrant a
10 mph reduction in the speed limit of a 3 lane dual carriageway in a
section of it where, unlike from Perivale onwards, houses are not directly
accessible from it, i.e there is a slip road in front of the houses in
this section, or there are no houses at all.

 

In a previous FOI request from another individual you stated the reason
the 30 mph limit was put in place was "To ensure that safety of all road
users

is maintained we implemented a 30mph speed limit while we investigate the
least disruptive way and time to replace the central barriers. "

 

How would reducing a speed limit impact your investigation?

Were accident levels monitored during the investigation? what other items
were monitored during the investigation?

 

The 40mph is a permanent speed limit change. The limit was changed because
this is the maximum speed, our risk assessments taking into account the
unique operation of the A40 at this location have concluded you can have a
dual or larger carriageway without a vehicle restraint system. The
defective barrier is potentially no longer capable of restraining a
vehicle impact at 50mph correctly hence the need for a reduction anyway on
safety grounds irrespective of houses or slip roads. Following a detailed
inspection of the barrier it was considered safe to raise the speed limit
to 40mph until the barrier is replaced or removed. At this current time
there are no plans to replace the barrier.

 

The speed limit was reduced for public safety not to enable the
investigation, as safety is our number one priority.

 

Accident levels were not monitored during the investigation and neither
was there a requirement to do so. The speed limit was reduced for public
safety as there is no requirement for safety fencing on a 40mph or slower
dual carriageway. As per our contract requirements the carriageway has a
safety inspection every 28 days.

 

If this is not the information you are looking for, or if you are unable
to access it for some reason, please do not hesitate to contact me.

 

Please see the attached information sheet for details of your right to
appeal as well as information on copyright and what to do if you would
like to re-use any of the information we have disclosed.

 

Yours sincerely

 

Eva Hextall

FOI Case Officer

 

FOI Case Management Team

General Counsel

Transport for London

 

 

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