Art Cashin of UBS, highlighted another sign of caution, via SentimenTrader:
"The Dow indexes are out of gear. The Dow Transportation Average continues to badly lag its brother index, the Dow Industrial Average.
The Transports are not only below their 200-day average, they just dropped to a fresh multi-month low.
Yet the Industrials are more than 5% above their own 200-day average, a divergence which has tended to resolve to the downside for both indexes, especially in the shorter term."
Source" Business Insider