An effective method for recording this information is with a condition diagram. It may be advantageous under certain circumstances to change the sequence in which left turns are served relative to their complementary through movements. A more detailed discussion of the advantages of leading left-turn phases is provided in Chapter 13 of the Traffic Engineering Handbook Communication facilitates coordination between controllers see below. The guidelines provided in this section can be used to design the right-turn movement detection when this movement has an exclusive lane or lanes.
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