HOV 3 QUESTION?

Many people today believe that life starts at conception and that a fertilized woman's egg is a "personhood."  The mayor has declared that people driving into Manhattan have to obey a High Occupancy Vehicle (HOV) 3 rule, i.e. three people in the vehicle.  SO if a woman declares she is carrying a personhood, does that account for two of the three?  What if she says it is twins?