The devices don’t stall you out while your driving. They only stop the engine from first starting. Please stop using incorrect information on this.

From: http://www.ignitioninterlockinc.com/faq.php

Q: Will the interlock device shut my car engine off?

A: No. An interlock device cannot turn off a running vehicle….All that an interlock can do is interrupt the starter circuit and prevent the engine from starting.

Q: What happens if I do not give another sample after the engine starts?

A: If the breath sample isn’t provided, or the sample exceeds the present blood alcohol level, the device will log the event, warn the driver, and then start up an alarm until the ignition is turned off, or a clean sample is provided.