| Topic: | Re:West Putney Speed Cushions | |
| Posted by: | Richard Hodges | |
| Date/Time: | 11/09/10 16:17:00 |
| There's no practical problem with display limits. Despite some detractors, they have been shown repeatedly to bring speeds down, and do so over an extended period (ie not just when they are new). In terms of cost-benefit (the latter being the nominal cost of a death, injury or damage), they are more cost-effective than cameras, better accepted by motorists, and they avoid the problems of the various speed bumps - damage liability, emergency service accessibility, etc. A question (apparently unanswered) is how effective they are at different speeds. They certainly work at 30/40mph, but less so at higher speeds (e.g. motorway advisory speeds), and my suspicion would be that they become ineffective below 30. The other problem is the speed distribution. Mean/mode/median speeds are reduced in line with the relevant limit, but they do nothing about the hooli who is flagrantly ignoring the limit anyway. One might wonder who is more likely to be involved in an incident, the occasional hooli doing 50mph+, or the many more doing 31mph. This is an utterly fundamental question - who's actually causing the danger - and worryingly you'll find it missing from pretty much every claim for or against 20mph zones and the various speed control methods. Similar problems exist with all systems. Speed bumps are less effective with certain vehicles that can handle rougher surfaces, and create their own issues with those they do slow. Fixed cameras are expensive (when they are not allowed to be used as revenue raisers) and whilst they have their place, the evidence grows that overall they did a lot less for safety than was being claimed. |
| Topic | Date Posted | Posted By |
| West Putney Speed Cushions | 06/09/10 17:39:00 | Guy Sunda |
| Re:West Putney Speed Cushions | 07/09/10 09:12:00 | Leonard S. Gore |
| Re:Re:West Putney Speed Cushions | 07/09/10 12:59:00 | Richard Carter |
| Agreed | 07/09/10 14:12:00 | Dan Bratton |
| Re:Agreed | 07/09/10 15:17:00 | Alan Sherman |
| Re:Re:Agreed | 07/09/10 16:37:00 | Jonathan Callaway |
| Re:Re:Re:Agreed | 07/09/10 16:59:00 | Jean Gilmore |
| Re:Re:Re:Re:Agreed | 07/09/10 18:48:00 | Jonathan Callaway |
| Re:Re:Re:Re:Re:Agreed | 08/09/10 13:05:00 | Mark Smith |
| Re:Re:Re:Re:Agreed | 07/09/10 19:11:00 | Dan Bratton |
| Re:Re:Re:Re:Re:Agreed | 07/09/10 19:17:00 | Jonathan Callaway |
| Re:Re:Re:Re:Re:Re:Agreed | 07/09/10 19:28:00 | Richard Carter |
| Re:Re:Re:Re:Re:Re:Agreed | 07/09/10 19:31:00 | Dan Bratton |
| Re:Re:Re:Agreed | 07/09/10 17:21:00 | Leonard S. Gore |
| Re:Re:Re:Re:Agreed | 07/09/10 18:40:00 | Jonathan Callaway |
| Re:Re:Re:Re:Re:Agreed | 08/09/10 11:21:00 | Leonard S. Gore |
| Re:Re:Re:Re:Re:Re:Agreed | 08/09/10 12:22:00 | Richard Carter |
| Stop Start B Smart | 08/09/10 13:52:00 | Guy Sunda |
| Re:Stop Start B Smart | 08/09/10 15:25:00 | Peter Savage |
| Re:Re:Stop Start B Smart | 08/09/10 16:21:00 | Suzanne Taylor |
| Re:Re:Re:Stop Start B Smart | 08/09/10 17:53:00 | Jonathan Callaway |
| Re:Re:Re:Stop Start B Smart | 08/09/10 18:15:00 | Mark Smith |
| Re:Re:Re:Re:Stop Start B Smart | 08/09/10 18:29:00 | Suzanne Taylor |
| Re:Re:Re:Re:Re:Re:Agreed | 08/09/10 17:38:00 | Jonathan Callaway |
| Damage caused by speed humps | 08/09/10 22:35:00 | Ian Scott |
| Re:Damage caused by speed humps | 09/09/10 09:50:00 | Jonathan Callaway |
| Re:Re:Damage caused by speed humps | 09/09/10 10:01:00 | Mark Smith |
| Re:Re:Re:Damage caused by speed humps | 09/09/10 17:53:00 | Jonathan Callaway |
| Speed humps - cause more harm than good | 10/09/10 11:31:00 | Adam Bailey |
| Re:Speed humps - cause more harm than good | 10/09/10 13:10:00 | Jonathan Callaway |
| Re:Re:Speed humps - cause more harm than good | 21/09/10 13:53:00 | Adam Bailey |
| Fuel Efficiency | 10/09/10 12:21:00 | Richard Hodges |
| Re:West Putney Speed Cushions | 10/09/10 12:44:00 | Nicki King |
| Re:Re:West Putney Speed Cushions | 11/09/10 12:27:00 | Jonathan Callaway |
| Re:Re:Re:West Putney Speed Cushions | 11/09/10 14:52:00 | Caroline Whitehead |
| Re:Re:Re:Re:West Putney Speed Cushions | 11/09/10 15:46:00 | Jonathan Callaway |
| Re:Re:Re:Re:Re:West Putney Speed Cushions | 11/09/10 16:12:00 | Simon Knight |
| Re:West Putney Speed Cushions | 11/09/10 16:17:00 | Richard Hodges |
| Re:Re:West Putney Speed Cushions | 11/09/10 16:29:00 | Martine Guy |
| Re:Re:Re:West Putney Speed Cushions | 11/09/10 16:45:00 | Simon Knight |
| Re:Re:Re:Re:West Putney Speed Cushions | 11/09/10 20:18:00 | Suzanne Taylor |
| Re:Re:Re:West Putney Speed Cushions | 11/09/10 21:17:00 | Nicki King |
| Re:Re:Re:Re:West Putney Speed Cushions | 12/09/10 21:28:00 | Jonathan Callaway |
| Re:Re:Re:Re:Re:West Putney Speed Cushions | 12/09/10 23:15:00 | Alan Thomson |
| Re:Re:Re:Re:Re:Re:West Putney Speed Cushions | 13/09/10 10:05:00 | Richard Carter |
| Re:Re:Re:Re:Re:Re:West Putney Speed Cushions | 13/09/10 18:40:00 | Jonathan Callaway |
| Re:Re:Re:Re:Re:Re:Re:West Putney Speed Cushions | 14/09/10 13:18:00 | Bryony Evens |
| Re:West Putney Speed Cushions | 14/09/10 14:26:00 | Nicki King |