In brief: 52 Sydney residents rated 73 security interventions. Design-led measures — lighting, sightlines, active frontages, community cohesion — were the safest-rated and most widely agreed upon. Enforcement-heavy controls rated lowest and divided the sample sharply. Some participants read intensive security as unsettling. The study does not establish a universal threshold. Protection and place quality are mutually constitutive — not competing values requiring trade-offs.
Public places are secured through bollards, barriers, cameras, guards, and screening. Those measures are chosen by professionals, specified against threat scenarios, and installed for compliance. The communities that actually use those places are rarely consulted.
This study asked Sydney residents to evaluate 73 security interventions. Not from a threat-mitigation perspective. From theirs.
What emerged challenges a foundational assumption in how urban security is designed: that more visible protection means more perceived safety. The data shows the opposite is frequently true — and that the measures most consistently associated with feeling safe look nothing like conventional security.
Why we did this research
Urban security and place quality are treated as competing values. Security adds barriers, surveillance, and control. Good places are open, welcoming, and human. The conventional assumption is that practitioners must negotiate the trade-off between the two.
We conducted this research because that framing is wrong — and the consequences of accepting it are significant.
Security literature develops from the threat side. It asks what interventions reduce risk. Urban design literature develops from the experience side. It asks what makes places work for people. Neither discipline has systematically asked communities to evaluate the full range of security interventions — design-led, technology-led, enforcement-led — on the same scale and at the same time.
The profession was operating on assumptions about what communities find reassuring. We wanted data.
What we did
An online survey presented 52 Sydney residents with 73 distinct security interventions — from good lighting and active frontages to CCTV, weapons screening, and physical barriers. Participants rated each on a seven-point scale from most unsafe to most safe, and provided open-ended responses about what makes public places feel safe or unsafe.
Professionals in security, planning, architecture, and urban design were excluded. The study was designed to capture end-user experience, not expert categorisation.
The study was conducted through the School of Built Environment at the University of Technology Sydney, supported by an Australian Government Research Training Program Scholarship.
Study scope: This exploratory online sample of 52 Sydney residents rated 73 interventions on a seven-point perceived-safety scale. Participants were not representative of Sydney as a whole: the sample skewed toward educated residents of inner and eastern Sydney. Ratings concerned described interventions, not observation of installed controls or crime outcomes. The manuscript is in preparation.
What we found
Communities don’t see security the way professionals design it
When community members evaluate security, they don’t think in categories of physical, electronic, and operational. The data reveals three dimensions that cut across professional typologies — and they explain why some measures reassure and others don’t.
The dominant dimension is intensity: how much overt control a measure projects into everyday space. Design-led measures — lighting, sightlines, active frontages, greenery, community cohesion — were consistently rated safest. Enforcement-heavy controls were rated lowest and generated the most disagreement.
The other two dimensions — guardianship (whether a measure feels backed by credible human response) and signalling versus control (whether it communicates readiness or imposes restriction) — shape how intensity is read. The same measure in different contexts lands differently.
Design-led measures are the most trusted — and the most agreed upon
The safest-rated interventions were also the most widely agreed upon. Good lighting, clear sightlines, CPTED design principles, and well-maintained spaces generated both high ratings and high consensus across the sample. Communities weren’t divided about these.
The most contested interventions — weapons screening, patrols, intensive surveillance — divided respondents sharply. High-intensity measures don’t just rate lower. They fracture consensus.
Intensive security can be read differently by different people
Some participants described intensive security as a signal of threat. This is an interpretation of reported perceptions, not a measured threshold that applies to every place or community.
The tipping point isn’t about removing security. It’s about understanding that calibration, integration, and communication determine whether a measure reassures or unsettles. The paper explores differences across intervention types; it does not locate a fixed boundary for design decisions.
What it means
The findings support three shifts in how urban security is approached.
Design-led measures are security’s most effective expression in everyday public space
Lighting, sightlines, active frontages, maintenance, and community activation are the interventions that communities consistently trust. Treating them as secondary to "real" security hardware is a strategic error — these are not supplements to protection, they are its most effective expression in the environments where people actually live and move.
High-intensity measures require proportionality, justification, and integration
Screening, barriers, and intrusive surveillance may be warranted where the risk is credible and clearly communicated. But deployed without context or calibration, they signal threat rather than safety. Acceptance varied in this sample. These ratings do not establish whether a measure prevents crime or withstands an attack; those questions require separate evidence.
Participation is not optional
Community tolerability thresholds cannot be determined by expert assessment. Safety audits, iterative consultation, and co-design processes are practical requirements for getting calibration right — not democratic add-ons to a technically determined answer.
The core concept the research advances is protective placemaking: the proposition that protection and place quality are mutually constitutive, not competing values requiring trade-offs. Security is most effective, and most accepted, when it is embedded in the spatial and social qualities that make places meaningful, welcoming, and alive.
Publication
Full findings, statistical analysis, and the intervention-by-intervention tolerability curve are being prepared for peer-reviewed publication. Register your interest and we’ll send the paper when it’s available.
Related research: The State of CPTED in NSW — analysis of 100 consultant-produced CPTED reports in the NSW planning system. Designing security into a public place? See Place-Based Safety services.