Other than the obvious to stop here on red? If this sign is at an intersection and you are turning right, does this mean you cannot turn right until the light turns green?
Regulatory Sign R10-6 is used for observance of stop lines. In construction zones, if there is a stop bar missing at a signalized intersection, then a sign would be placed to inform the driver of the vehicle where to stop.
It's really self explanatory, but I figured, what the heck...I'll tell the kid anyway.