If I see them I yell out...
Fat Sweaty OLD Guy on a bicycle with Poor Vision, Hearing, Balance, Reaction Time, and Breathing... Coming Up On Your SIX...
I'll leave it up to them what direction they want to take...
Did have a young guy who was running when I did this. He started running faster. Then he slowed and allowed me to catch up. With a smile he pulled his phone and asked if I needed 911.... Ha
As to the OP: Honestly a simple Ding will do...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)
Last edited by zandoval; 10-29-21 at 05:00 PM.