The traffic sign for "Bicycle traffic left-turning" indicates that cyclists are allowed or required to turn left at the intersection. This sign is typically meant to inform drivers to be especially watchful for bicycles making left turns, as they may be crossing traffic. It's important for drivers to yield to cyclists when they are turning, ensuring the safety of all road users. Cyclists should also make sure to follow any additional signals or rules that may apply when turning left, such as designated bike lanes or traffic lights specifically for bicycles.