i used to use "on your left" all the time, but the walking zombies dont understand what it means. So now i use a 160 Decible dual tone siren and blast it for 2 - 5 seconds as i approach them. They get it now.

as for what i do when someone announces "on your left" ........i hold my line and dont wobble bobble all over the road in total shock and surprise, unlike 99.9% of the peds and sunday bumblers and ipodderjogger bobbers out there. Its called situational awareness and i i strongly believe 99.9% of the peds, sunday bumblers and ipodderjoggers seriously need to get some.