Is this common? I've never seen anyone going 55 in the express lane in the 15 years I've been here. What freeway is this on? I feel like people get tailgated for going the limit in the fast lane, so 10 under would really stand out.
I see it (and worse) every day on the southbound 101 between the airport/Millbrae and 3rd ave exits, and on the northbound side between the 92 bridge onramp all the way up to the airport. They do get tailgated. They just don't care.