The three major indices hit new historical highs again, while the Dow Jones Transportation Index's weakness raises concerns about a "bull trap."

The three major U.S. stock indices reached historic highs, but the Dow Jones Transportation Index fell against the trend, with a cumulative decline of nearly 2%. The weakness in the Transportation Index has raised concerns in the market about weakening economic momentum, potentially signaling a "bull trap." Experts point out that the Transportation Index and the Industrial Index need to rise in tandem to confirm economic expansion, and the current divergence may indicate an increased risk of economic recession