U.S. stocks got a shot in the arm on Tuesday from strong corporate earnings reports out of Merck (MRK) - Get Report and Schering-Plough( SGP), as well as comments from Treasury Secretary Timothy Geithner, who said the government will step up efforts to fight the recession.

One area of strength on Tuesday was the transportation sector, which advanced 3.77%. Many market players subscribe to the idea that transportation stocks are key drivers for the overall stock market and the economy.

Could the strength in the transports be signaling a bottom in the stock market and the economy? It makes sense to assume that when economic activity is strong, people are flying more and businesses are moving more goods. However, one day doesn't make a trend, so investors need to continue to watch the transportation action for further signs of a recovery.

With this in mind, let's take a look at four transportation stock charts (including

Dry Ships

(DRYS) - Get Report

) for more clues on a possible economic recovery. These charts could be signaling noticeable moves higher

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