The speed offset problem: a case for principled cultural sensitivity in automated vehicle design

Abstract

Automated vehicles are widely expected to play a key role in achieving the European Union’s road safety target of ‘Vision Zero’, which aims to eliminate all road fatalities in the European Union by 2050. To achieve this goal, early design strategies for automated vehicles prioritised strict compliance with traffic rules, assuming that rule-abiding behaviour would inherently lead to safer outcomes. Yet rule deviations such as speeding may, counter-intuitively, enhance safety in situations where strict compliance cannot reasonably be expected. Such cases highlight a discrepancy between legal compliance and the informal norms that often govern complex real-world traffic. They also expose an ambivalence in compliance. It is often framed as a necessary precondition for safety, yet in certain contexts, strict compliance can itself generate avoidable risks. This design challenge is what I call the ‘speed offset problem’. The problem becomes particularly evident when examined across different cultural contexts, where expectations around acceptable speeding vary significantly. Building on this, I argue that ‘principled cultural sensitivity’ is fundamental for ethically sound design of automated vehicles. As a normative framework, it demands sensitivity to local driving cultures whilst maintaining firm commitment to core ethical principles. The article develops and applies this framework to the speed offset problem, exemplifying how these guardrails may take shape in concrete cases. Three ethical guardrails restrict the speed offset’s implementation. First, a speed offset is morally permissible only when it increases overall safety. Second, a speed offset must not increase overall safety at the expense of particular groups. Third, a speed offset’s legitimacy must be temporary and revisable. Together, these guardrails ensure that speed offsets are not a concession to unsafe norms but a temporary and ethically guided calibration, bridging current traffic realities with long-term safety goals. The article concludes by outlining implications for engineering practice and regulatory frameworks.