Geoff Collins is stretching the limits of credibility in his defence of Vysionics’ claims that SPECS average speed cameras reduce KSI (killed and seriously injured) casualties by more than 70% (Letters LTT 8 Mar).
While he acknowledges that regression to the mean can have an impact on casualty reductions between before-and-after periods, he then tries to dismiss it by saying that a high number of casualties in the three-year period before installation (compared with earlier years) may be...
+88% more
Includes full online access to TransportXtra.com and searchable archive
Essential reading for public and private sector transport professionals in the UK and beyond
Stay ahead of the competition – hear it first
Written by leading experts in the transport industry
Additional publications throughout the year covering specific subjects Active Travel Directory, Loveable Neighbourhoods and Data and Modelling
Access to our webinar library
Full access to the 50,000 article archive
Tailored E-bulletins
TransportXtra is part of Landor LINKS
© 2025 TransportXtra | Landor LINKS Ltd | All Rights Reserved
Subscriptions, Magazines & Online Access Enquires
[Frequently Asked Questions]
Email: subs.ltt@landor.co.uk | Tel: +44 (0) 20 7091 7959
Shop & Accounts Enquires
Email: accounts@landor.co.uk | Tel: +44 (0) 20 7091 7855
Advertising Sales & Recruitment Enquires
Email: daniel@landor.co.uk | Tel: +44 (0) 20 7091 7861
Events & Conference Enquires
Email: conferences@landor.co.uk | Tel: +44 (0) 20 7091 7865
Press Releases & Editorial Enquires
Email: info@transportxtra.com | Tel: +44 (0) 20 7091 7875
Privacy Policy | Terms and Conditions | Advertise
Web design london by Brainiac Media 2020
