One part of the extensive safety pledge that you must sign before starting the Bicycle Ride Across Georgia (BRAG) is that you will not announce "CLEAR" as you pass through an intersection. This is a common practice on the club rides of most clubs, including ours. But it is dangerous for more than one reason.
In the noise and wind conditions on a bike ride, it is easy to mistake the call or "CAR" for the call of "CLEAR." The implications of this error should be intuitively obvious.
When YOU go through the intersection, it may be clear. But by the time the next rider gets there it may not be. By announcing that it was clear, you may even have some legal liability if something bad happens.
When proceeding through an intersection and seeing an approaching vehicle, you should definitely call out "CAR" and the direction from which it is coming, "RIGHT" or "LEFT." If another person going through the intersection at the same time fails to see the vehicle, and calls out "CLEAR," they may drown out your warning, or at the very least confuse the situation.
The bottom line is that you should always look before entering an intersection, whether or not a call has been made. After all, it is your skin that is on the line.