A1 (Warning—Dangerous curve) is a Swedish road sign belonging to category A (Warnings signs). Closer provisions are given in the road sign ordinance (SFS 2007:90): The sign warns about a dangerous curve, and indicates the direction of said curve. The variant A1-1 indicates a curve to the left.
transportstyrelsen.se 



Source materials for this file are available from Commons Archive:

Sweden road sign A1-1.eps
Government of Sweden