"Your left" is all thats required in my book. If somebody is on the streets and haven't come across that they should be pushing that bike not riding it. and...10 MINUTES! I would have died in shame knowing I was blocking someone for 10 minutes I always view it more as a courtesy to the other biker then a "request"...announcing "I'm coming through"...give the courtesy 1-3 second and then pedal on by. That is unless the tower tells you that the pattern is full...but Maverick did anyway.