2009 Edition Chapter 3C. Roundabout Markings
01 A roundabout (see definition in Section 1A.13) is a specific type of circular intersection designed to control speeds and having specific traffic control features.
03 Markings on the approaches to a roundabout and on the circular roadway should be compatible with each other to provide a consistent message to road users and should facilitate movement through the roundabout such that vehicles do not have to change lanes within the circulatory roadway in order to exit the roundabout in a given direction.
04 Figure 3C-1 provides an example of the pavement markings for approach and circulatory roadways at a roundabout. Figure 3C-2 shows the options that are available for lane-use pavement marking arrows on approaches to roundabouts. Figures 3C-3 through 3C-14 illustrate examples of markings for roundabouts of various geometric and lane-use configurations.
Figure 3C-1 Example of Markings for Approach and Circulatory Roadways at a Roundabout
Figure 3C-2 Lane-Use Arrow Pavement Marking Options for Roundabout Approaches
Figure 3C-3 Example of Markings for a One-Lane Roundabout
Figure 3C-4 Example of Markings for a Two-Lane Roundabout with One- and Two-Lane Approaches
Figure 3C-5 Example of Markings for a Two-Lane Roundabout with One-Lane Exits
Figure 3C-6 Example of Markings for a Two-Lane Roundabout with Two-Lane Exits
Figure 3C-7 Example of Markings for a Two-Lane Roundabout with a Double Left Turn
Figure 3C-8 Example of Markings for a Two-Lane Roundabout with a Double Right Turn
Figure 3C-9 Example of Markings for a Two-Lane Roundabout with Consecutive Double Left Turns
Figure 3C-10 Example of Markings for a Three-Lane Roundabout with Two- and Three-Lane Approaches
Figure 3C-11 Example of Markings for a Three-Lane Roundabout with Three-Lane Approaches
Figure 3C-12 Example of Markings for a Three-Lane Roundabout with Two-Lane Exits
Figure 3C-13 Example of Markings for Two Linked Roundabouts
Figure 3C-14 Example of Markings for a Diamond Interchange with Two Circular-Shaped Roundabout Ramp Terminals
05 Traffic control signals or pedestrian hybrid beacons (see Part 4) are sometimes used at roundabouts to facilitate the crossing of pedestrians or to meter traffic.
06 Section 8C.12 contains information about roundabouts that contain or are in close proximity to grade crossings.
02 A through lane on a roadway that becomes a dropped lane (mandatory turn lane) at a roundabout shall be marked with a dotted white lane line in accordance with Section 3B.04.
05 Section 9C.04 contains information regarding bicycle lane markings at roundabouts.
02 Where a white edge line is used for the circulatory roadway, it should be as follows (see Figure 3C-1):
- A solid line adjacent to the splitter island, and
- A wide dotted line across the lane(s) entering the roundabout.
02 If pedestrian facilities are provided, crosswalks (see Section 3B.18) should be marked across roundabout entrances and exits to indicate where pedestrians are intended to cross.
02 YIELD (word) and YIELD AHEAD (symbol or word) pavement markings (see Figure 3C-1) may be used on approaches to roundabouts.
03 Word and/or route shield pavement markings may be used on an approach to or within the circulatory roadway of a roundabout to provide route and/or destination guidance information to road users (see Figure 3C-14).
06 If used on approaches to a roundabout, lane-use arrows may be either normal or fish-hook arrows, either with or without an oval symbolizing the central island, as shown in Figure 3C-2.