of singapore couple want to 'book' police officers for illegal parking, but kena booked instead

No parking here for even lawmen?: A Singaporean couple Mr Ong Eng Chowg and his wife, Marilyn, spotted a police car parked at a "No Parking" area. They parked their car and approached the police officers to remove the police car.



Instead the couple got booked for illegal parking because they parked their car behind the police car.

Mr Ong said that one of the cops, a staff sergeant, explained that he had parked his vehicle in the lane to attend to a sleeping drunk in the coffee shop in Block 232. The officer also pointed out that the no-parking sign at the shelter had an additional note that read: 'except police, ambulance and authorised vehicles', so it was legal for the police to park in the lane. They then booked Mr Ong for illegally parking his car behind the police car. This angered the couple. Mr Ong said he then told the staff sergeant 'in a raised but controlled voice' that he was 'doing his civic duty', so he shouldn't 'pull rank' with him.

What is the meaning of 'in a raised but controlled voice'?

[via HWZ]