For newcomers to the term, SMIDSY is an acronym for Sorry Mate, I Didn't See You. The idea is, that in certain curcumstances, you can make yourself more visible to other motorists who might not notice you or accurately judge your distance or speed by making non-dramatic swerves within your lane. The lateral movement captures peoples attention: "is that guy drunk, crazy, going to crash into me?" "Maybe I shouldn't pull out in front of him!" Most important, they noticed you as a possible threat. (Someone will shortly provide the 7 minute video which I did not, alas, re-watch.) I'm new enough to this idea that I am not a regular practitioner of it. My questions for the believers: WHEN do you use the SMIDSY swerve and when do you NOT use it? I can think of three obvious places where it is a good strategy; all rural roads, which is what I mostly ride: 1. Possible hidden cars which could pass toward you in your lane. 2. People at stop signs or driveways waiting to cross the highway you are on or make a turn into your path. 3. People who could make a left turn from the oncoming lane. Your further comments?