A9 (Warning—Speed impediment) is a common designation for two Swedish road signs which belong to the category of warning signs (group A). Closer provisions are given in the road sign ordinance (SFS 2007:90): The signs warn about bumps or dips which have been installed as a speed reduction measure. The variant A9-2 indicates (a) dip(s).
transportstyrelsen.se 



Source materials for this file are available from Commons Archive:

Sweden road sign A9-2.eps
Transportstyrelsen, re-made by Gigilo83