The presence or absence of a median has a substantial impact on roadway operations and safety. Medians can be categorized into the following:
Non-traversable median: a physical barrier in the roadway that separates traffic traveling in the opposite directions, such as a concrete barrier or a landscaped island. These are recommended for all new or reconstructed multi-lane highways. Additional details are included in the Kentucky Median Type Guidance.
Continuous two-way left-turn lane (TWLTL): a continuous lane located between opposing traffic streams that provides a refuge area for vehicles to complete left turns from both directions. A TWLTL is only recommended in limited applications.
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