The 85th Percentile Rule

The 85th Percentile Rule is a guideline used in setting speed limits. It suggests that the speed limit should be at or above the speed that 85% of drivers are already traveling safely on a road. This approach aims to establish reasonable limits that reflect actual driving behavior, rather than just theoretical standards. By doing so, it encourages compliance and reduces unsafe driving conditions. Essentially, it balances safety and practicality, ensuring speed limits are fair, attainable, and promote safe driving habits.