Tony, I take your point but as the signals are becoming green, the worst a motorist can assume is that they are on green. I would be more concerned if the red appeared between 0.4 and 0.6 of a second before the amber disappears. I wonder if anyone has witnessed this? Regards Peter (just waking up in the corner!) Peter Jones Project Leader - Traffic Control Systems Phone: +44 (0) 151 934 4254 Fax: +44 (0) 151 922 4514 Mobile: 07788 100 584 Peter.Jones (AT) technical.sefton.gov.uk Sefton MBC - UTC 7th Floor Balliol House Balliol Road Bootle L20 3NJ ----------------------------------------------------------- A message from the TCUG mailing list. For information about the list visit //www.freelists.org/webpage/tcug