Abstract
This report summarises the findings of Research Area 2 within the European MASTER (MAnaging Speeds of Traffic on European Roads) project, and addresses the question "what are the key factors influencing drivers' choice of speed?" The report deals with present speeds and speed management methods, speed enforcement, motivation and acceptability of driving speeds, road design and speed behaviour, and cognitive road classification processes and driving speed. Results are based upon literature reviews, survey studies, behavioural studies in a driving simulator, and laboratory experiments.