DEFINITION AND DESCRIPTION

Longitudinal pavement markings (e.g., edge lines, lane lines and center lines) typically discontinue in areas such as intersections and large, commercial entrances.  Offset, skewed, complex, or multi-leg intersections, on curved roadways, may create “visual traps” and cause driver confusion.  Multiple or offset left-turn lanes may also benefit from dotted lane line extensions to guide drivers as they complete their turn. Dotted lane line extensions can be used to better delineate the intended vehicle path through intersections.

Implementation Categories

CONSIDERATIONS

• Consult the MUTCD Section 3B.11 for more information on applications.
• TO-504 includes guidance on dotted lane line extensions.  They are required for multiple turn lanes through the intersection.
• The TPM series Standard Drawings include typical pavement markings.
• Crosshatching may be used in areas at least 6 ft wide.
• Dotted lane line extension markings consist of 2 ft line segments and 2-6 ft gaps.  The MUTCD allows for solid lane lines or channelizing lines to extend into or through an intersection where greater restriction is preferred.

APPLICATION

• Develop pavement marking recommendations for “visual traps”.  Consider intersection geometry, curvature, width of entrances, and intersection tapers.  Also consider temporary pavement markings in work zones.
• Pavement marking details or plans abating the visual traps should be provided to:
• Maintenance prior to resurfacing
• Construction for applicable phases of traffic control
• Project development teams for permanent markings on capital improvement projects

example

Image Source: Google Earth

Complementary SSA Strategies

• Human Factors Guidance – Countermeasures to Improve Pavement Delineation