Definition of "HOV"

Ultimately, Ms. Bottone said she just wanted to know whether she could keep driving in the H.O.V. lane for the remainder of her pregnancy, as she said she had in her previous pregnancies, long before the overturning of Roe.

2022 July 12, Luke Vander Ploeg, “Can You Drive Alone in the H.O.V. Lane if You’re Pregnant? A Post-Roe Quandary.”, in The New York Times‎