I yell out "Bike Behind" from about 30 yards. If they hear me- they look behind and if they don't look I have time to yell again.
Doesn't help with one rider we have on our MUP and the Regulars Know him. He Has a Jersey with "I am Deaf" printed on the back. He keeps his line and is the ideal one to pass. Always well to one side of the path and "NEVER" deviates from his line. Problem is that His Mum can't keep up with him now and he is only about 10 years old.
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How long was I in the army? Five foot seven.
Spike Milligan