What is a left turn signal?
Left Turn signal phases facilitate left turning traffic and usually improve the safety of the intersection for left turning vehicles. However, this is done at the expense of the amount of green time available for through traffic and will usually reduce the capacity of the intersection. Left turn arrows also result in longer cycle lengths which will in turn have a detrimental effect by increasing stops and delays. While adding a left turn phase can often improve safety and reduce delay, other solutions such as timing adjustments to improve gaps for left turns and geometric improvements to improve sight distance may be more appropriate. More details on left turn signals is provided in Information Brochures section of Traffic Operations.
