When ‘yes’ doesn’t mean ‘I understand’: the hidden safety risk on multicultural construction sites

A worker nods through a safety briefing, follows the correct procedure and appears fully compliant. But what if they have not actually understood the safety message?

My MSc research investigated this hidden risk on multicultural UK construction sites. Based on semi-structured interviews with 18 participants – 10 migrant construction workers and eight supervisors/managers – the study examined how language and cultural differences influence safety understanding, behaviour and everyday site operations.

The findings challenge a common assumption: communication barriers are not simply a matter of poor English. Accents, colloquial language, background noise, time pressure, workplace hierarchy and cognitive overload can all contribute to misunderstanding. Some workers reported nodding during safety briefings despite only partially understanding the message, while managers could interpret silence as confirmation that instructions had been understood.

Crucially, the research identified a gap between functional compliance and deep understanding. Workers may reproduce safe practices through observation, repetition and imitation without fully understanding why those practices are necessary. This apparent compliance can become a vulnerability when workers encounter unfamiliar hazards or changing conditions.

The research therefore argues that communication barriers should be treated as an organisational safety risk, rather than simply an individual worker deficiency.

Construction organisations should standardise safety language, strengthen visual communication and create environments where workers feel confident seeking clarification. Supervisors should also use techniques such as teach-back – asking workers to explain instructions in their own words – to verify genuine understanding rather than assuming that a nod means “yes”.

Because in construction, compliance is not enough. Understanding is what keeps people safe.