I've driven through places where the lanes change directions or get closed based on traffic flow, most often near sports/entertainment arenas, and they tend to have one or two lanes with dashed white lines which are always open and the rest of the 3+ lanes are dashed yellow. I've always wondered if this is an exception to a rule, or if there even is a definite DOT rule (or if localities can override DOT regulations, such as in the case of rainbow crosswalks). I do recall in my driver's education classes 20+ years ago that a dashed yellow is "allowed to enter and exit but not for travel" but again that may have been a local rule.
