The 55mph Maryland rolling roadblocks were for speed enforcement. Didn't last too long, probably when Maryland realized they weren't getting any revenue from it. Anyway, they caused massive traffic tie-ups behind them.
Anyway, you can try to eat traffic waves on the Schuylkill expressway, but it probably won't work. #1, Schuylkill drivers will pull in front of you as soon as you leave a gap. #2, the waves on the Schuylkill are generally caused by physical features (curves and interchanges). As for his other techniques -- use them, and you're contributing to a jam behind you even as you may alleviate the jam in front of you.
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