Two-way traffic ahead
二方向交通(にほうこうこうつう)
Meaning
A warning sign indicating that the road ahead becomes two-way traffic (二方向交通). It calls for attention where a one-way road or a road with a median changes to two-way traffic.
Common mistake on the test
It warns that an oncoming lane will appear. It is installed on two-way sections of expressways, etc.