It looks as if I'm obsessed with signs this week. Remember when I griped about people idling their cars. for what seems like hours on end? Well I found some kindred spirits in Maine. This sign is in the parking lot of a school in downtown Portland, and, there was a similar sign urging tour buses not to idle in the parking lot in front of the lighthouse at Portland Head. Yes, they both seem to focus on buses, but it's a start.