B-2 No entry
What it means
Bans entry to the road or carriageway from the side where the sign stands. It also applies to columns of pedestrians, riders and drovers. Most often it marks the exit end of a one-way road: entry from the other end is allowed. A "Nie dotyczy" plate exempts the vehicles shown.
B-2 is the "brick". You do not enter from the side of the sign, but traffic in the opposite direction flows normally.