I assume it was the same car a few mins later following me along Sauchiehall St and up into Rose Street? Pulled up beside each other and said hello. Was going to ask if a member of SE, but the lights changed and impatient taxi man behind started tooting the horn!
I think if there is a dictionary definition of the shortest period of time measurable to man, it would be the time it takes the driver behind to toot his horn when a filter lane green light comes on!