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It is a good idea to CALL OUT when you see a road hazard. Call it out loud and clear to gain the attention of riders near you. You want them to hear you above the traffic and wind noise.
The most import call out is "STOPPING" It is also a good idea to use non rhyming words as it is difficult to distinguish words like "ROLLING" "GOING" or "SLOWING" So say something like "STOPPING" and "PEDALING"
Find more good info at; http://cyclingtips.com.au/2009/09/verbal-and-non-verbal-communication/,