The most common and most likely answer to this crossword clue is the 3 plus 4 letter word ICE FREE
I've seen this crossword clue in Financial Times
I
C
E
F
R
E
E
Buddy explains!

The straight part
We know that "like salted roads" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like salted roads = ice free.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ICE FREE mean?
ICE FREE adjective- Free of all ice, not covered in ice.