Final answer:
The security suggestions of trimming landscaping and installing CCTV are related to the CPTED principle of natural surveillance, which increases the likelihood of potential criminal activities being observed and thereby helps to deter crime.
Step-by-step explanation:
The facet of the Crime Prevention Through Environmental Design (CPTED) approach being addressed is natural surveillance. Trimming back landscaping around entrances improves visibility, deterring criminal behavior by increasing the chance that unwanted activities will be observed. Installing CCTV at entrances also enhances natural surveillance by creating a video record of activity, which can both deter crime and aid in the investigation of incidents that do occur.
Police tactics that are based on natural surveillance concepts, such as improved lighting and the use of CCTV, have been found to reduce crime in certain contexts. Techniques such as community-oriented policing and targeted patrols in crime hotspots have also demonstrated effectiveness in crime prevention. Meanwhile, dealing with landscape disorder, like graffiti and vandalism, based on Broken Window Theory, can prevent an escalation of criminal activity and improve community safety.