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Full-size image of Figure 3B-4

Figure 3B-4. Example of Three-Lane, Two-Way Marking for Changing Direction of the Center Lane

This figure illustrates pavement markings for changing direction of the center lane of a three-lane, two-way roadway. The figure is noted as "not to scale."

A vertical three-lane roadway is shown. A solid double yellow line is shown separating each lane from the others with the notation "Two directional no passing marking." The exception to that, at the top of the figure, is one segment of a broken white line shown separating the two southbound lanes. At the top of the figure, the distance between the last broken white line segment and the start of the southbound taper from two lanes to one is marked "3/4 d" with a note that "d = Advance Warning Distance" and a note to "see Section 2C.05."

Two southbound lanes are shown transitioning to one lane. A solid double yellow line is shown adjacent to the southbound lane in this taper and has a notation of "Two directional no passing marking." This taper is shown ending at the northern end of a segment labeled "Buffer zone" and the northern end of a segment labeled "Zone of limited sight distance, Car 'Y,' " which extends southward approximately 2/3 the length of the buffer zone.

From the bottom of the figure, two northbound lanes are shown transitioning to one lane. A solid double yellow line is shown adjacent to the northbound lane in this taper and has a notation of "Two directional no passing marking" and is marked as "L," with a note to "see Fig. 3B-12." This taper is shown ending at the southern end of a segment labeled "Buffer zone" and the southern end of a segment labeled "Zone of limited sight distance, Car 'X,' " which extends northward approximately 2/3 of the length of the buffer zone.

Car "X" is shown in the northbound single lane in the initial portion of the "Zone of limited sight distance, Car 'X.' " Car "Y" is shown in the southbound single lane in the initial portion of the "Zone of limited sight distance, Car 'Y.' "

A note indicates "See Section 3B.02 for determining the minimum length of the buffer zone."

A legend shows a black arrow indicating the direction of travel in the lanes.

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