It is something not rolling on the streets, yet. It would put a 'brake' or 'lock' on the first motor generator at high speeds so the engine provides all of the cruise power and the traction electrical system goes into a low power mode. This reduces energy losses when cruising.

My data on the Prius suggests this could improve Prius highway performance at speeds above 50 mph:

http://hiwaay.net/~bzwilson/prius

Bob Wilson

Operation Iraqi Oil Freedom:

Automatic, stock, project car.

My other 1500 cc car:

Automatic, stock, backup car.
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