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28 Guidelines for Selection of Speed Reduction Treatments at High-Speed Intersections 3.6.3 Driver Perception, Satisfaction Surveys Surveying drivers about their perception of the treatment may provide insights into the effec- tiveness of a treatment. If drivers indicate that they were aware of the treatment, that the treat- ment increased their awareness of the intersection, or that it influenced them to slow down, these results may indicate that a treatment is effective. It is not advisable to implement treatments based on neighborhood or political complaints if these complaints are not supported by an engineering analysis that indicates a speeding prob- lem. However, the observations and perceptions of local residents and businesses can provide insight into the effectiveness of a treatment. 3.7 Summary Various treatments have the potential to reduce speeds at high-speed intersections. These include specific intersection treatments as well as design elements typically considered for road- way segments. Each intersection must be assessed to understand its unique characteristics and how it may be affected by speed. With this understanding, the user can consider which treatments are most likely to reduce speeds. The effectiveness of a particular treatment will vary considerably depend- ing on the conditions of the specific application. The potential treatments have a wide range of applicability, cost, secondary impacts, imple- mentation considerations, and potential effectiveness in reducing speeds and increasing safety. To quantify the safety effects of speed reduction treatments at high-speed intersections, conditions will need to be monitored for a number of years after the treatment is implemented. The next section provides more detail on each treatment type, including a discussion of treatment applications, considerations, and possible effectiveness.