In a multidisciplinary safety strategy, road safety professionals know that roadway users respond best to information combined with what?

• A. Public campaigns
• B. Financial incentives
• C. Physical interventions in the environment
• D. Enforcement efforts

Answer: (C)

When trying to change road user behavior, information alone nudges people, but its impact is strongest when it’s supported by changes to the road itself. Physical interventions in the environment—engineering measures like speed-reducing designs, safer crosswalks, protected lanes, better lighting, and clear sightlines—make safe choices the easiest or most natural option at the moment of decision. So, pairing information with these engineering changes creates a more reliable path to safer behavior than information alone or other approaches. Public campaigns, financial incentives, and enforcement can help, but without the environment supporting safer choices, the impact is limited.