Polite/Proper Way To Notify Pedestrians and Bicycles A question on a bell had a lot of comments on how to notify pedestrians.

How do you notify a pedestrian you need to pass?  

How do you notify a bicycle you need to pass?

I imagine this will be region dependent so please state your region.

This is getting a bit of response and it clearly varies by region.  I will give it a couple more hours and just award the answer to the most votes.
From Southern California, when approaching slower traffic from behind on bike lanes and paths: "On your left" meaning that you are passing them on their left-hand side. Only left. People hear the "On" portion of the call and they start moving to their right. 

I can't ever recall hearing "On your right". Good thing, too. Would be a mess.