Spencer Palmer 
Head of Traffic Management Engineering 
Traffic Management Division 
Department for Transport 
Zone 2/07 
 
Great Minster House 
76 Marsham Street 
Mr A J Baker 
London 
By email 
SW1P 4DR 
 
 
Web Site: www.dft.gov.uk 
 
 
 
Our Ref: F0005890 
 
 
 
9 December 2009 
 
Dear Mr Baker, 
 
 
Research regarding tyre wear and speed cushions 
 
Thank you for your email of 18 November 2009 requesting an internal review of our 
response to your Freedom of Information request no. F0005890.  
 
I have now completed a review of your correspondence with the Department on this 
matter. I apologise for any confusion or misunderstanding on our part and trust that the 
answers below provide the information you require. 
 
Question: Is TRL report 614 the only research that has been done on the effect of speed 
cushions on vehicles and/or tyres? 
 
Answer: Yes. DfT is not aware of any other research into the effect of speed cushions on 
vehicles. 
 
Question: Does TRL report 614 cover the impact of speed cushions on tyres? 
 
Answer: No. 
 
If you are not content with the outcome of the internal review, you have the right to apply 
directly to the Information Commissioner for a decision. The Information Commissioner 
can be contacted at: Information Commissioner’s Office, Wycliffe House, Water Lane, 
Wilmslow, Cheshire, SK9 5AF 
 
Yours sincerely, 
 
 
Spencer Palmer 

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