Same here- I got the permit on my last EV, (Chevy Bolt) but since my first EV in 2016, I used the Maryland HOV lanes with just me in the car, exactly...... once. Looks like it's most useful for folks commuting regularly on rt. 50 or I-270.
By the way, hello from Perry Hall; 1 month owner of a Dusk Blue Pro S, and loving it. I haven't seen any ID's around here in the wild, although my dealer seemed to be selling quite a few of them (Heritage VW in Parkville)....
