Proven to work remarkably well but I didn't see much discussion on its use.
There are drawbacks:
It pisses some truckers off.
You have to be hyper alert because room for reaction is minimal.
In high ambient heat + long duration situations, the reduction of airflow over the radiator can lead to increased operating temperatures.
Legality varies from state to state (tailgating type of laws).
GasSavers_davens 
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