I agree that camera ticketing removes a key constitutional protection, and I don't mean to detract from the issue raised in the article. The issue with "if no one is around they don't need enforcement" is that it implies that it's ok for drivers to use their judgement to determine if they can safely exceed the speed limit in a given context. How does the driver truly know that "no one is around"? We can't allow this to be a defense, "I was doing 45 because the streets were empty so it was perfectly safe..."

The purpose of a municipality displaying posted speed limits is that they have made a determination of what the safe speed is for that area, given road conditions, visibility, and proximity to pedestrians or bicyclists or road hazards. If this is too slow for you, then lobby to change the posted speed limit, but don't just speed because you think it's safe.