SIR, — Your correspondent Steve Bridgstock (Herts Advertiser, March 20), rightly challenges the statistical basis of the claims that speed cameras save lives . The truth is even more slanted than the case he makes. He correctly states that an accident bl
SIR, - Your correspondent Steve Bridgstock (Herts Advertiser, March 20), rightly challenges the statistical basis of the claims that speed cameras "save lives". The truth is even more slanted than the case he makes.
He correctly states that an accident black-spot, the basis for installing a camera-site, is defined by "at least four serious accidents in a three-year period".
This implies four separate incidents, which would seem fair enough, but the truth is rather different. The "black-spot" criteria is in fact satisfied by single incident provided four fatalities or seriously injured were involved. In other words, a single accident can give rise to the installation of a speed-camera. Even if there has not been an accident in the previous 20 years or even longer, it makes no difference. Small wonder then that safety seemingly then improves. What in fact happens is that the statistics have simply "regressed to norm", hardly surprising if the "black-spot" assessment was founded on a single random event.
You may also want to watch:
Melbourne Close, St Albans.
- 1 Elderly care charity set to close due to pandemic pressures
- 2 Flashmob celebrates re-opening of St Albans high street
- 3 What are our district's cases like now lockdown restrictions have eased?
- 4 Punch Taverns calls time on White Lion pub team
- 5 Local talent packs out the bill for Harpenden festival
- 6 Major redevelopment underway at listed former offices in St Albans
- 7 April 12: Your guide to what can open from Monday when COVID lockdown rules ease
- 8 What are the district's best pub gardens to visit from April 12?
- 9 St Albans-based pharmacy association celebrates centenary
- 10 The latest court results for the St Albans area