TWLTLTwo-Way Left Turn Lane (median treatment on roadways that allows left turns from both directions)
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Safer than TWLTL in six-lane sections but depends on number of signals/mile, driveways/mile, ADT, and approaches/mile.
Mukherjee, D.; Chatterjee, A.; and Margiotta, R.; Choosing Between a Median and a TWLTL for Suburban Arterials, ITE Journal, July 1993.