SPX's (S & P 500) volume spiked dramatically to 4.674/4.505 billion shares the past 2 days

SPX's (S & P 500, http://bit.ly/i0nsT) volume spiked dramatically to 4.674/4.505 billion shares the past 2 days, from only 3.220/3.453/3.352/3.365 billion shares the prior 4 days, which points to peaking action.