At the commencement of a pursuit, all officers get officially reminded of their obligations under the pursuit criteria...Initial Phase Pursuit for standard driving permits (beat officers) and T-Pac authority for Advanced (Traffic) permits. The pursuing officer has then to keep the control room supervisor informed as to the safety and progress of the pursuit (via the radio) as it continues. If the pursuit AT ANY TIME becomes unsafe, then either party must abort the pursuit. The helicopter frequently assists, obviously, so this provides a live downlink to the control room supervisor who can then view the pursuit in live time and we have now got a new in-car CCTV system that can also provide a live link to the control room too.
Suffice to say that safety is paramount at all times but the risk threat can change in an instant and that's when people can get hurt.