Bespoke Research firm says "Prior to the digital revolution that began in the 1990s, the Dow Transports were viewed as a “leading” indicator for the broader stock market. In the digital age, there’s hardly an industry group that doesn’t rely on semiconductors in one way or another. A modern car can easily have more than 3,000 chips. We view the semiconductor group as the “Transports of the 21st century,” making the price action for semis important to monitor."
I agree and will be monitoring the SMH/SPY