Why are dotted lane lines now required instead of broken lane lines to separate an acceleration lane or deceleration lane from the adjacent through lane?

The previous use of normal broken lane lines did not provide sufficient information to indicate to road users that the acceleration lane or deceleration lane is not a lane that continues beyond the interchange. The dotted lane line markings now required in Section 3B.04 of the 2009 MUTCD clearly distinguish these as lanes that do not continue. Return to Top • Q: Why wasn't Section 3B.09 changed to also require a dotted lane line, rather than a normal broken lane line, on the approach to a lane-reduction transition?

Isn't this another example of a "non-continuing lane" that would be appropriate for use of a dotted lane line? A: Although the FHWA originally proposed to also require a dotted lane line approaching a lane-reduction transition, that proposal was not adopted in the final rule for the 2009 MUTCD. FHWA determined that lane-reduction transitions may be significantly different from lane drop situations, because a lane-reduction transition occurs between interchanges or between ... more.

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