Lane reversal signals are used to control the direction of traffic on specific lanes of a roadway. A common use of this control is reversible lanes that change the flow of traffic during different times of the day. The signal(s) over one or more lanes change between a red X and a green arrow.

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Original Article Source Credits:   Alberta.ca , https://www.alberta.ca/

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Link to Original Article:  https://www.alberta.ca/lane-reversal-signals.aspx