Modifiers matching safety:

• systemic,
• pedestrian,
• passive,
• structural,
• personal,
• electrical,
• public,
• occupational,
• interior,
• marine,
• internal,
• general,
• industrial,
• active,

Simple categories matching pedestrian:

• measure,
• area,
• facility,
• cover,
• experience,
• activity,
• path,
• space,
• control,
• passage,
• access,
• flow,
• use,
• hazard,
• traffic,
• walkway,
• event,
• pathway,
• issue,
• plaza,
• covering,
• protection,
• medium,
• surface,
• object,
• formation,
• feature,
• furniture,
• safety,
• improvement,
• furnishing,
• signal,
• usage,
• route,
• location,
• project,