Mr. Wilson
Note: I was able to drive at 55
MPH to the gas station (I was on a highway) just on electric. My recomendation would be "don't brake" to reduce speed, except for the ICE I had full control over everything else in the car.
Also note that the actual light that comes on that is the scariest is "WARNING BATTERY DISCHARGE." That is the one that made me figure out what was going on but is also the one that would have someone call for a tow.