This is the 11097th most frequent Russian word.
гололедицы
"Гололедицы" refers to "icy conditions" or "black ice."
Here, 'гололедицы' is used in the genitive case to indicate the cause of difficult road conditions.
В результате гололедицы движение по дорогам стало затруднительным.
As a result of the icy conditions, traffic on the roads became difficult.
In this sentence, 'гололедице' is in the dative case, as it relates to providing warnings about it.
Вчера вечером мы предупреждали водителей о возможной гололедице.
Yesterday evening, we warned drivers about possible icy conditions.
Here, 'гололедица' is the subject of the sentence in nominative case, describing the occurrence of icy conditions.