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We start with an overview of speed impact on road transport. We discuss present speeds and speed management measures on road. A new integrated ISA system is presented in this paper. The system involves GPS/DGPS (Global Positioning System/differential GPS) based location and navigation, DSRC (dedicated short-range communications) beacon, vehicle wireless communication, traffic and travel information (TTI), and in-vehicle speed limiter. Such ISA system could externally, automatically and dynamically adapt vehicle speeds in changeable conditions, like incidents and weather conditions and in place and time related critical conditions. The results of system modelling and field trials are also shown.