Do brighter, whiter street lights improve road safety?

摘要

Several years ago, the Australian government received a pitch from an association of public works professionals to spend A$1 billion to upgrade the country's street lights to white light (typically LEDs). That is a sizeable price tag, but the "Roadmap" document made the claim that if an 8% reduction in night-time road traffic collisions (RTCs) was achieved by adding white light, it would generate cost savings of more than A$500 million per year (bit.ly/2a3qcgm).