We’re always hearing stuff like:  Every driver on the road thinks THEY are an awesome driver . . . and everyone else is TERRIBLE.  But this is a little more realistic . . .     A new survey asked Americans how THEY’D do on a driving test if they had to take one right now . . . and only 40% of people are confident they could ace it.  On the flipside, about 25% of people admit they’d probably FAIL.     It isn’t just knowing the rules of the road . . . many Americans admit they don’t even know their own vehicles.     The average driver understands about 78% of their dashboard indicators and warning lights.  Most people know their oil light and the check engine one . . . but less than half could identify their tire pressure light and the brake system warning.     Most people said they’d Google what a warning light meant if they didn’t know . . . while 15% admitted that they’ve NEVER looked at their car’s owner’s manual.     (SWNS)