Cambridge cops cycling crackdown spoiled

Police in Cambridge issued ten fixed penalty notices last week in a crackdown against cyclists riding the wrong way up a one-way street last Thursday, but were unaware that further up the street, a woman was warning other bike riders of the operation.

According to the website Cambridge News, police say that they would have arrested the woman for obstruction had they known what she was doing.

But as ‘cavasta’ rightly asks

What's the difference between what the woman in this story was doing and signs warning speeding motorists that "speed cameras are in operation in this area"?