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3.
Being able to use an HOV lane legally due to lesser restrictions placed during certain hours. Usually used in the context of using the lane right before the stronger restrictions come into effect.

For example, if an HOV lane is HOV-2 from 4-6PM and open to all traffic at all other times, leaving work no later than 3:30PM with a single occupant in your vehicle would be termed "HOV Positive"
"Can we leave class early today, we want to be HOV Positive."
by DJHCS May 25, 2012
 
1.
Having enough occupants in your vehicle so as to legally use an HOV lane.
With my two kids in the car, I'm HOV positive!
by Locotrol October 23, 2008
 
2.
A car that meets requirements for driving in the HOV lane.
When my wife and I drive together the car is HOV Positive.
by drbillcorcoran April 14, 2010