What does this supplementary plate indicate?

Question

KET Užduotys · Accepted Answer

Correct answer: A stretch marked this way is often slippery because of ice or snow.. Explanation: Supplementary plate No. 848 “Icy road” is used with another sign (usually “Speed limit” or “Slippery road”) and means that sign applies only when the surface is icy or covered with snow.. KET reference: KET 1 pr. 848: Icy road. A stretch marked this way is often slippery because of ice or snow.