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Multimodal interactions and considerations are addressed within the HCMAG in the context of these five facility types. The HCMAG also identifies and discusses interactions that occur between adjacent components of the transportation system, such as the operational effects of installing a new traffic signal on an arterial with pre-existing upstream and downstream signalized intersections. It is anticipated that future versions of the HCMAG will be expanded to address more comprehensively the other facility types contained in the HCM.

All analyses within the HCMAG are conducted in U.S. Customary units, reflecting the continuing predominant use of these analysis units throughout the United States. This should not have any great bearing on the overall usefulness of the Guidebook, whose overarching purpose is to increase user understanding of the appropriate application of HCM procedures and the appropriate interpretation of the results.

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