Overview

"Underkylt vägavsnitt" =Subcooled road section

Section of the road where supercooling (undercooling) may occur. Thus this road will be very slippery in cold conditions and you need to drive in as high gear as possible (High gear low torque and decreases wheel spin)

Gears

1: Low gear

Car has a lot of torque
Increases the risk of wheelspin

2:
3:
4:
5: High gear

Car has less torque
Decrease risk of wheelspin

R :Reverse

Note that the road can be straight as well for this warning sign to be placed there. The reason why the road is also bent is to make the question more difficult