traffic guide zone; diagonal white line area
A road marking consisting of diagonal white lines used to guide traffic flow, often at intersections or merging lanes.
交差点の導流帯には進入しないでください。
Do not enter the diagonal white line area at the intersection.
Compound of 導流 (dōryū, 'guiding flow') and 帯 (tai, 'zone' or 'belt'), referring to a marked area that directs traffic.