Ellis, While I was working in London I was designing a signal scheme which had t= his type of 'reverse' SD it was on Wandsworth Rd in Lambeth. I'm not sure= if this implemented though. You could contact TfL to find out though Regards Terry Bedding Assistant Engineer Traffic Signals & Systems Tel: 01223 717 727 Fax: 01223 718 538 -----Original Message----- From: tcug-bounce@xxxxxxxxxxxxx [mailto:tcug-bounce@xxxxxxxxxxxxx]On Behalf Of Ellis Clarke Sent: 13 June 2007 12:08 To: tcug@xxxxxxxxxxxxx Subject: [TCUG] Red lights We have has query from a Local Authority highway engineer regarding the=20= use of red traffic signals to stop drivers who are exceeding the speed=20= limit. A system is in use in Spain whereby a vehicle exceeding the speed limit=20= immediately calls a red traffic signal some 100 to 150 metres down the=20= road, which stops the speeding vehicle.=20 We have been asked if there are any similar systems in use in the UK and=20= if any systems are approved for use in the UK. Any feedback would be appreciated. Regards, Ellis Clarke GMUTC Manchester City Council Second Floor 2 Piccadilly Place M1 3BN Tel 0161 247 3190 Fax 0161 228 1530 e.clarke@xxxxxxxxxxxxxxxxx http://www.manchester.gov.uk ********************************************************************** Manchester City Council supports Smokefree England - 1 July 2007 This email and any files transmitted with it are confidential and intende= d solely for the use of the individual or entity to whom they are address= ed. If you have received this email in error please notify the system man= ager. This footnote also confirms that this email message has been swept by MIM= Esweeper for the presence of computer viruses. Please contact internet.administrators@xxxxxxxxxxxxxxxxx with any queries= =2E ********************************************************************** ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug The information in this email is confidential and may be legally privile= ged. It is intended solely for the addressee. If you receive this email b= y mistake please notify the sender and delete it immediately. Opinions e= xpressed are those of the individual and do not necessarily represent th= e opinion of Cambridgeshire County Council. All sent and received email f= rom Cambridgeshire County Council is automatically scanned for the presen= ce of computer viruses and security issues ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug